TY  - JOUR
AU  - Chen, Minjun
AU  - Kumrić, Ksenija
AU  - Thacker, Conner
AU  - Prodanović, Radivoje
AU  - Bolognesi, Guido
AU  - Vladisavljević, Goran T.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12210
AB  - In this work, the possibility of fabricating composite magneto-optical ceramics by electrophoretic deposition (EPD) of nanopowders and high-temperature vacuum sintering of the compacts was investigated. Holmium oxide was chosen as a magneto-optical material for the study because of its transparency in the mid-IR range. Nanopowders of magneto-optical (Ho0.95La0.05)2O3 (HoLa) material were made by self-propagating high-temperature synthesis. Nanopowders of (Y0.9La0.1)2O3 (YLa) were made by laser synthesis for an inactive matrix. The process of formation of one- and two-layer compacts by EPD of the nanopowders from alcohol suspensions was studied in detail. Acetylacetone was shown to be a good dispersant to obtain alcohol suspensions of the nanopowders, characterized by high zeta potential values (+29–+80 mV), and to carry out a stable EPD process. One-layer compacts were made from the HoLa and YLa nanopowders with a density of 30–43%. It was found out that the introduction of polyvinyl butyral (PVB) into the suspension leads to a decrease in the mass and thickness of the green bodies deposited, but does not significantly affect their density. The possibility of making two-layer (YLa/HoLa) compacts with a thickness of up to 2.6 mm and a density of up to 46% was demonstrated. Sintering such compacts in a vacuum at a temperature of 1750 °C for 10 h leads to the formation of ceramics with a homogeneous boundary between the YLa/HoLa layers and a thickness of the interdiffused ion layer of about 30 μm.
T2  - Gels
T1  - Selective Adsorption of Ionic Species Using Macroporous Monodispersed Polyethylene Glycol Diacrylate/Acrylic Acid Microgels with Tunable Negative Charge
VL  - 9
IS  - 11
SP  - 849
DO  - 10.3390/gels9110849
DO  - 10.3390/gels9110849
ER  - 

@article{
author = "Chen, Minjun and Kumrić, Ksenija and Thacker, Conner and Prodanović, Radivoje and Bolognesi, Guido and Vladisavljević, Goran T.",
year = "2023",
abstract = "In this work, the possibility of fabricating composite magneto-optical ceramics by electrophoretic deposition (EPD) of nanopowders and high-temperature vacuum sintering of the compacts was investigated. Holmium oxide was chosen as a magneto-optical material for the study because of its transparency in the mid-IR range. Nanopowders of magneto-optical (Ho0.95La0.05)2O3 (HoLa) material were made by self-propagating high-temperature synthesis. Nanopowders of (Y0.9La0.1)2O3 (YLa) were made by laser synthesis for an inactive matrix. The process of formation of one- and two-layer compacts by EPD of the nanopowders from alcohol suspensions was studied in detail. Acetylacetone was shown to be a good dispersant to obtain alcohol suspensions of the nanopowders, characterized by high zeta potential values (+29–+80 mV), and to carry out a stable EPD process. One-layer compacts were made from the HoLa and YLa nanopowders with a density of 30–43%. It was found out that the introduction of polyvinyl butyral (PVB) into the suspension leads to a decrease in the mass and thickness of the green bodies deposited, but does not significantly affect their density. The possibility of making two-layer (YLa/HoLa) compacts with a thickness of up to 2.6 mm and a density of up to 46% was demonstrated. Sintering such compacts in a vacuum at a temperature of 1750 °C for 10 h leads to the formation of ceramics with a homogeneous boundary between the YLa/HoLa layers and a thickness of the interdiffused ion layer of about 30 μm.",
journal = "Gels",
title = "Selective Adsorption of Ionic Species Using Macroporous Monodispersed Polyethylene Glycol Diacrylate/Acrylic Acid Microgels with Tunable Negative Charge",
volume = "9",
number = "11",
pages = "849",
doi = "10.3390/gels9110849, 10.3390/gels9110849"
}

Chen, M., Kumrić, K., Thacker, C., Prodanović, R., Bolognesi, G.,& Vladisavljević, G. T.. (2023). Selective Adsorption of Ionic Species Using Macroporous Monodispersed Polyethylene Glycol Diacrylate/Acrylic Acid Microgels with Tunable Negative Charge. in Gels, 9(11), 849.
https://doi.org/10.3390/gels9110849

Chen M, Kumrić K, Thacker C, Prodanović R, Bolognesi G, Vladisavljević GT. Selective Adsorption of Ionic Species Using Macroporous Monodispersed Polyethylene Glycol Diacrylate/Acrylic Acid Microgels with Tunable Negative Charge. in Gels. 2023;9(11):849.
doi:10.3390/gels9110849 .

Chen, Minjun, Kumrić, Ksenija, Thacker, Conner, Prodanović, Radivoje, Bolognesi, Guido, Vladisavljević, Goran T., "Selective Adsorption of Ionic Species Using Macroporous Monodispersed Polyethylene Glycol Diacrylate/Acrylic Acid Microgels with Tunable Negative Charge" in Gels, 9, no. 11 (2023):849,
https://doi.org/10.3390/gels9110849 . .

TY  - CONF
AU  - Petrović, Đorđe Ž.
AU  - Stanković, Katarina
AU  - Kumrić, Ksenija
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12079
AB  - The present study investigated potential application of biopolymer chitosan, in the form of gel beads, for the removal of Congo red (CR) dye from aqueous solution. Chitosan hydrogel beads (CHBs) were prepared by a coupled ionic and covalent co-cross-linking, employing citric acid (CA) and glutaraldehyde (Glu) as an ionic and a chemical crosslinker, respectively. Batch experiments were carried out to optimize the process conditions for efficient removal of CR dye and to determine the adsorption capacity of prepared CHBs. The results showed that the highest removal efficiency of CR was obtained in the pH range from 6 to 10, and that the equilibrium was attained after 180 min. The Langmuir isotherm model provided the best correlation for the adsorption of CR onto CA/Glu cocross-linked CHBs, with the maximum adsorption capacity (qm) of 544.2 mg g-1 .
AB  - Istraživanja u okviru ove studije okrenuta su ka ispitivanju mogućnosti primene hidrogelova hitozana, u obliku sfera, za uklanjanje boje kongo crveno (CR) iz vodenih rastvora. Sfere hidrogela hitozana (CHBs) pripremljene su spregnutim jonskim i kovalentnim umrežavanjem, pri čemu su limunska kiselina (CA) i glutaraldehid (Glu) korišćeni kao jonski i kovalentni umreživač, respektivno. Eksperimenti su rađeni u šaržnom sistemu kako bi se optimizovali uslovi za efikasno uklanjanje CR iz vode i odredili adsorpcioni kapaciteti sintetisanih CHBs. Eksperimentalni rezultati su pokazali da je efikasnost uklanjanja CR najveća u pH intervalu od 6 do 10, a da se ravnoteža uspostavlja nakon 180 minuta. Langmirova izoterma pokazala je najbolju korelaciju za adsorpciju CR boje na CA/Glu umreženim sferama hidrogelova hitozana, pri čemu maksimalni adsorpcioni kapacitet (qm) iznosi 544.2 mg g-1 .
PB  - Belgrade : Serbian Chemical Society
C3  - 59th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings
T1  - Adsorption characteristics of chitosan hydrogel beads toward removal of Congo red dye from aqueous solutions
T1  - Adsorpcione karakteristike hidrogelova hitozana za uklanjanje boje kongo crveno iz vodenih rastvora
SP  - 164
EP  - 167
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12079
ER  - 

@conference{
author = "Petrović, Đorđe Ž. and Stanković, Katarina and Kumrić, Ksenija",
year = "2023",
abstract = "The present study investigated potential application of biopolymer chitosan, in the form of gel beads, for the removal of Congo red (CR) dye from aqueous solution. Chitosan hydrogel beads (CHBs) were prepared by a coupled ionic and covalent co-cross-linking, employing citric acid (CA) and glutaraldehyde (Glu) as an ionic and a chemical crosslinker, respectively. Batch experiments were carried out to optimize the process conditions for efficient removal of CR dye and to determine the adsorption capacity of prepared CHBs. The results showed that the highest removal efficiency of CR was obtained in the pH range from 6 to 10, and that the equilibrium was attained after 180 min. The Langmuir isotherm model provided the best correlation for the adsorption of CR onto CA/Glu cocross-linked CHBs, with the maximum adsorption capacity (qm) of 544.2 mg g-1 ., Istraživanja u okviru ove studije okrenuta su ka ispitivanju mogućnosti primene hidrogelova hitozana, u obliku sfera, za uklanjanje boje kongo crveno (CR) iz vodenih rastvora. Sfere hidrogela hitozana (CHBs) pripremljene su spregnutim jonskim i kovalentnim umrežavanjem, pri čemu su limunska kiselina (CA) i glutaraldehid (Glu) korišćeni kao jonski i kovalentni umreživač, respektivno. Eksperimenti su rađeni u šaržnom sistemu kako bi se optimizovali uslovi za efikasno uklanjanje CR iz vode i odredili adsorpcioni kapaciteti sintetisanih CHBs. Eksperimentalni rezultati su pokazali da je efikasnost uklanjanja CR najveća u pH intervalu od 6 do 10, a da se ravnoteža uspostavlja nakon 180 minuta. Langmirova izoterma pokazala je najbolju korelaciju za adsorpciju CR boje na CA/Glu umreženim sferama hidrogelova hitozana, pri čemu maksimalni adsorpcioni kapacitet (qm) iznosi 544.2 mg g-1 .",
publisher = "Belgrade : Serbian Chemical Society",
journal = "59th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings",
title = "Adsorption characteristics of chitosan hydrogel beads toward removal of Congo red dye from aqueous solutions, Adsorpcione karakteristike hidrogelova hitozana za uklanjanje boje kongo crveno iz vodenih rastvora",
pages = "164-167",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12079"
}

Petrović, Đ. Ž., Stanković, K.,& Kumrić, K.. (2023). Adsorption characteristics of chitosan hydrogel beads toward removal of Congo red dye from aqueous solutions. in 59th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings
Belgrade : Serbian Chemical Society., 164-167.
https://hdl.handle.net/21.15107/rcub_vinar_12079

Petrović ĐŽ, Stanković K, Kumrić K. Adsorption characteristics of chitosan hydrogel beads toward removal of Congo red dye from aqueous solutions. in 59th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings. 2023;:164-167.
https://hdl.handle.net/21.15107/rcub_vinar_12079 .

Petrović, Đorđe Ž., Stanković, Katarina, Kumrić, Ksenija, "Adsorption characteristics of chitosan hydrogel beads toward removal of Congo red dye from aqueous solutions" in 59th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings (2023):164-167,
https://hdl.handle.net/21.15107/rcub_vinar_12079 .

TY  - CONF
AU  - Petrović, Đorđe Ž.
AU  - Stanković, Katarina
AU  - Slavković Beškoski, Latinka
AU  - Kumrić, Ksenija
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12082
AB  - Mine waters and tailings resulting from mining and mineral processing often have a harmful effect on the local environment. Copper has a strong biocidal activity that greatly affects ecosystems. Therefore, the removal of copper from wastewater is of great importance to the environment. Chitosan, a natural biopolymer, obtained from chitin, the most abundant natural fiber, often has better properties than much more expensive synthetic polymers. This paper investigates the application of chitosan-based sorbents for removing copper from aqueous solutions. A novel adsorbent, chitosan hydrogel beads (CHBs), was synthesized from chitosan flakes (medium molecular weight), via ionic/covalent cross-linking. Batch experiments were carried out to optimize the process conditions for efficient removal of Cu(II) and to determine the adsorption capacity of prepared CHBs. The results showed that the maximum Cu(II) adsorption capacity estimated with Langmuir isotherm modeling was 103.6 mg/g which was three times higher than chitosan flakes (33.7 mg/g).
PB  - University of Belgrade : Technical Faculty in Bor
C3  - IOC 2023 : 54th International October Conference on Mining and Metallurgy : Proceedings book
T1  - Removal of Cu(II) from aqueous solutions using adsorbent based on chitosan hydrogel beads
SP  - 175
EP  - 178
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12082
ER  - 

@conference{
author = "Petrović, Đorđe Ž. and Stanković, Katarina and Slavković Beškoski, Latinka and Kumrić, Ksenija",
year = "2023",
abstract = "Mine waters and tailings resulting from mining and mineral processing often have a harmful effect on the local environment. Copper has a strong biocidal activity that greatly affects ecosystems. Therefore, the removal of copper from wastewater is of great importance to the environment. Chitosan, a natural biopolymer, obtained from chitin, the most abundant natural fiber, often has better properties than much more expensive synthetic polymers. This paper investigates the application of chitosan-based sorbents for removing copper from aqueous solutions. A novel adsorbent, chitosan hydrogel beads (CHBs), was synthesized from chitosan flakes (medium molecular weight), via ionic/covalent cross-linking. Batch experiments were carried out to optimize the process conditions for efficient removal of Cu(II) and to determine the adsorption capacity of prepared CHBs. The results showed that the maximum Cu(II) adsorption capacity estimated with Langmuir isotherm modeling was 103.6 mg/g which was three times higher than chitosan flakes (33.7 mg/g).",
publisher = "University of Belgrade : Technical Faculty in Bor",
journal = "IOC 2023 : 54th International October Conference on Mining and Metallurgy : Proceedings book",
title = "Removal of Cu(II) from aqueous solutions using adsorbent based on chitosan hydrogel beads",
pages = "175-178",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12082"
}

Petrović, Đ. Ž., Stanković, K., Slavković Beškoski, L.,& Kumrić, K.. (2023). Removal of Cu(II) from aqueous solutions using adsorbent based on chitosan hydrogel beads. in IOC 2023 : 54th International October Conference on Mining and Metallurgy : Proceedings book
University of Belgrade : Technical Faculty in Bor., 175-178.
https://hdl.handle.net/21.15107/rcub_vinar_12082

Petrović ĐŽ, Stanković K, Slavković Beškoski L, Kumrić K. Removal of Cu(II) from aqueous solutions using adsorbent based on chitosan hydrogel beads. in IOC 2023 : 54th International October Conference on Mining and Metallurgy : Proceedings book. 2023;:175-178.
https://hdl.handle.net/21.15107/rcub_vinar_12082 .

Petrović, Đorđe Ž., Stanković, Katarina, Slavković Beškoski, Latinka, Kumrić, Ksenija, "Removal of Cu(II) from aqueous solutions using adsorbent based on chitosan hydrogel beads" in IOC 2023 : 54th International October Conference on Mining and Metallurgy : Proceedings book (2023):175-178,
https://hdl.handle.net/21.15107/rcub_vinar_12082 .

TY  - CONF
AU  - Egerić, Marija
AU  - Devečerski, Aleksandar
AU  - Matović, Ljiljana
AU  - Kumrić, Ksenija
AU  - Petrović, Đorđe Ž.
AU  - Vujasin, Radojka
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12085
AB  - Rapid growth of human population has led to increased water demand by various industries and production of large amount of wastewater. Textile, leather, paper, and plastics industries wastewater, which contains organic pollutants such as dyes, needs a proper treatment in order to be safely discharged into the environment, therefore, new methods are being developed. This research is based on investigation of photocatalytic degradation of an azo-type dye Congo Red (CR) by using powdered UiO-66 type MOF (Metal Organic Framework), activated carbon (AC) and their composite powder mixtures made with different MOF/AC ratios. Additionally, this research includes investigation of renewability of these materials in several experimental cycles. Experiments were performed in batch conditions, samples were exposed to solar light irradiation, then centrifuged to remove solid particles and in order to determine the concentration of the remaining dye, solutions were analyzed by UV-ViS spectrophotometer. Renewability of the photocatalysts used in experiments was investigated by repeating this process three times, with catalysts dried at 50 °C between cycles. Results have shown that pure MOF has excellent and almost identical photocatalytical efficiency in every cycle, compared to all MOF/AC composites and pure AC, probably due to the saturation of available adsorption sites in AC. CR removal efficiency and renewability of various composites depends on MOF/AC ratio, therefore, the most efficient composites are the ones where MOF content varies from 25 wt. % up to 100 wt. %. Samples with MOF content 50 - 100 wt. % have shown excellent renewability, while composites where AC is more dominant (95 - 100 wt. %) have shown almost none. Among the composites examined in this paper, the one with MOF/AC ratio of 50/50 has shown the best cost/performance ratio in removal of Congo red dye from aqueous solution.
PB  - Portugal : University of Aveiro
C3  - YCN 2023 : Young Ceramists Network Workshop : Book of Abstracts
T1  - Assessment of optimum ratio of Metal Organic Framework and activated carbon in composites for photocatalytic removal of Congo Red dye
SP  - 34
EP  - 34
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12085
ER  - 

@conference{
author = "Egerić, Marija and Devečerski, Aleksandar and Matović, Ljiljana and Kumrić, Ksenija and Petrović, Đorđe Ž. and Vujasin, Radojka",
year = "2023",
abstract = "Rapid growth of human population has led to increased water demand by various industries and production of large amount of wastewater. Textile, leather, paper, and plastics industries wastewater, which contains organic pollutants such as dyes, needs a proper treatment in order to be safely discharged into the environment, therefore, new methods are being developed. This research is based on investigation of photocatalytic degradation of an azo-type dye Congo Red (CR) by using powdered UiO-66 type MOF (Metal Organic Framework), activated carbon (AC) and their composite powder mixtures made with different MOF/AC ratios. Additionally, this research includes investigation of renewability of these materials in several experimental cycles. Experiments were performed in batch conditions, samples were exposed to solar light irradiation, then centrifuged to remove solid particles and in order to determine the concentration of the remaining dye, solutions were analyzed by UV-ViS spectrophotometer. Renewability of the photocatalysts used in experiments was investigated by repeating this process three times, with catalysts dried at 50 °C between cycles. Results have shown that pure MOF has excellent and almost identical photocatalytical efficiency in every cycle, compared to all MOF/AC composites and pure AC, probably due to the saturation of available adsorption sites in AC. CR removal efficiency and renewability of various composites depends on MOF/AC ratio, therefore, the most efficient composites are the ones where MOF content varies from 25 wt. % up to 100 wt. %. Samples with MOF content 50 - 100 wt. % have shown excellent renewability, while composites where AC is more dominant (95 - 100 wt. %) have shown almost none. Among the composites examined in this paper, the one with MOF/AC ratio of 50/50 has shown the best cost/performance ratio in removal of Congo red dye from aqueous solution.",
publisher = "Portugal : University of Aveiro",
journal = "YCN 2023 : Young Ceramists Network Workshop : Book of Abstracts",
title = "Assessment of optimum ratio of Metal Organic Framework and activated carbon in composites for photocatalytic removal of Congo Red dye",
pages = "34-34",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12085"
}

Egerić, M., Devečerski, A., Matović, L., Kumrić, K., Petrović, Đ. Ž.,& Vujasin, R.. (2023). Assessment of optimum ratio of Metal Organic Framework and activated carbon in composites for photocatalytic removal of Congo Red dye. in YCN 2023 : Young Ceramists Network Workshop : Book of Abstracts
Portugal : University of Aveiro., 34-34.
https://hdl.handle.net/21.15107/rcub_vinar_12085

Egerić M, Devečerski A, Matović L, Kumrić K, Petrović ĐŽ, Vujasin R. Assessment of optimum ratio of Metal Organic Framework and activated carbon in composites for photocatalytic removal of Congo Red dye. in YCN 2023 : Young Ceramists Network Workshop : Book of Abstracts. 2023;:34-34.
https://hdl.handle.net/21.15107/rcub_vinar_12085 .

Egerić, Marija, Devečerski, Aleksandar, Matović, Ljiljana, Kumrić, Ksenija, Petrović, Đorđe Ž., Vujasin, Radojka, "Assessment of optimum ratio of Metal Organic Framework and activated carbon in composites for photocatalytic removal of Congo Red dye" in YCN 2023 : Young Ceramists Network Workshop : Book of Abstracts (2023):34-34,
https://hdl.handle.net/21.15107/rcub_vinar_12085 .

TY  - CONF
AU  - Vujasin, Radojka
AU  - Kumrić, Ksenija
AU  - Devečerski, Aleksandar
AU  - Omerašević, Mia
AU  - Egerić, Marija
AU  - Petrović, Đorđe Ž.
AU  - Matović, Ljiljana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12083
AB  - Dyes and pigments are used by many industries to color their products. In this study, we applied two different kinds of waste materials: used radioactive sources and carbon waste tire char (WTC) to study their simultaneous effect of irradiation/adsorption on dye degradation. Irradiation of methylene blue (MB) by high energy γ radiation derived from used radioactive sources in the presence of carbon based material made of waste tire granules caused enhanced decoloration of the MB. Delivered dose of  radiations differ depending on the type of isotope. The best decoloration was achieved using 60Co isotope. Complete decoloration of 20 ml of MB solution having concentration of 100 mg dm-3 of WTC was achieved with delivered doze of only 60 Gy. Decoloration of 90% was achieved after only 20 min while complete decoloration of MB solution (100%) was obtained in the irradiated samples after only 100 min. Processes that use ionizing radiation (α, β and γ) for decoloration of dyes are characterized as advanced oxidation processes which normally utilize a strong oxidizing species to break down the macromolecules. High energy radiation in water medium can produce radiolysis of water i.e. formation of several active species such as H2, H2O2, H+, OH− , eaq− , •OH and •H which are responsible for chemical reactions in water solutions. The significance of this approach is, except using waste materials for achieving enhanced degradation of organic pollutants in the solution, avoiding the need for safe disposal and storage of waste radioactive sources. Also, less waste material is generated at the end of the simultaneous irradiation/sorption process compared to the pure sorption process. Surface composition of WTC, needed to elucidate the key mechanism of synergism of MB degradation, during the simultaneous adsorption/irradiation was obtained using FTIR and XPS technique. OH-  ions, that originate from radiolysis of water induced by gamma irradiation and from the surface of WTC, play the crucial role in degradation of MB. MB molecule adsorbed at the surface of WTC is electronically reorganized and as a consequence degradated via the opening of the central aromatic ring containing both heteroatoms, S and N. OH-  ions produced by water radiolysis also cause degradation of MB molecules in the solution.The synergetic effect is a result of the attack of • OH radicals on electrostatic reorganized MB molecule adsorbed on surface of carbon material. Opening of central aromatic ring of MB firstly appeared in cleavage of the double C-S+ =C bond and then cleavage of double N=C bond.
PB  - Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade
PB  - Belgrade : Serbian Society for Innovative Materials in Extreme Conditions (SIM-EXTREME)
C3  - IMEC 2022 : 1st Intentational conference on innovativ materials in extreme conditions : Program and Book of abstracts
T1  - Water under extreme conditions: simultaneous gamma irradiation/carbon char adsorption resulted in improved methylene blue degradation
SP  - 56
EP  - 56
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12083
ER  - 

@conference{
author = "Vujasin, Radojka and Kumrić, Ksenija and Devečerski, Aleksandar and Omerašević, Mia and Egerić, Marija and Petrović, Đorđe Ž. and Matović, Ljiljana",
year = "2022",
abstract = "Dyes and pigments are used by many industries to color their products. In this study, we applied two different kinds of waste materials: used radioactive sources and carbon waste tire char (WTC) to study their simultaneous effect of irradiation/adsorption on dye degradation. Irradiation of methylene blue (MB) by high energy γ radiation derived from used radioactive sources in the presence of carbon based material made of waste tire granules caused enhanced decoloration of the MB. Delivered dose of  radiations differ depending on the type of isotope. The best decoloration was achieved using 60Co isotope. Complete decoloration of 20 ml of MB solution having concentration of 100 mg dm-3 of WTC was achieved with delivered doze of only 60 Gy. Decoloration of 90% was achieved after only 20 min while complete decoloration of MB solution (100%) was obtained in the irradiated samples after only 100 min. Processes that use ionizing radiation (α, β and γ) for decoloration of dyes are characterized as advanced oxidation processes which normally utilize a strong oxidizing species to break down the macromolecules. High energy radiation in water medium can produce radiolysis of water i.e. formation of several active species such as H2, H2O2, H+, OH− , eaq− , •OH and •H which are responsible for chemical reactions in water solutions. The significance of this approach is, except using waste materials for achieving enhanced degradation of organic pollutants in the solution, avoiding the need for safe disposal and storage of waste radioactive sources. Also, less waste material is generated at the end of the simultaneous irradiation/sorption process compared to the pure sorption process. Surface composition of WTC, needed to elucidate the key mechanism of synergism of MB degradation, during the simultaneous adsorption/irradiation was obtained using FTIR and XPS technique. OH-  ions, that originate from radiolysis of water induced by gamma irradiation and from the surface of WTC, play the crucial role in degradation of MB. MB molecule adsorbed at the surface of WTC is electronically reorganized and as a consequence degradated via the opening of the central aromatic ring containing both heteroatoms, S and N. OH-  ions produced by water radiolysis also cause degradation of MB molecules in the solution.The synergetic effect is a result of the attack of • OH radicals on electrostatic reorganized MB molecule adsorbed on surface of carbon material. Opening of central aromatic ring of MB firstly appeared in cleavage of the double C-S+ =C bond and then cleavage of double N=C bond.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade, Belgrade : Serbian Society for Innovative Materials in Extreme Conditions (SIM-EXTREME)",
journal = "IMEC 2022 : 1st Intentational conference on innovativ materials in extreme conditions : Program and Book of abstracts",
title = "Water under extreme conditions: simultaneous gamma irradiation/carbon char adsorption resulted in improved methylene blue degradation",
pages = "56-56",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12083"
}

Vujasin, R., Kumrić, K., Devečerski, A., Omerašević, M., Egerić, M., Petrović, Đ. Ž.,& Matović, L.. (2022). Water under extreme conditions: simultaneous gamma irradiation/carbon char adsorption resulted in improved methylene blue degradation. in IMEC 2022 : 1st Intentational conference on innovativ materials in extreme conditions : Program and Book of abstracts
Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade., 56-56.
https://hdl.handle.net/21.15107/rcub_vinar_12083

Vujasin R, Kumrić K, Devečerski A, Omerašević M, Egerić M, Petrović ĐŽ, Matović L. Water under extreme conditions: simultaneous gamma irradiation/carbon char adsorption resulted in improved methylene blue degradation. in IMEC 2022 : 1st Intentational conference on innovativ materials in extreme conditions : Program and Book of abstracts. 2022;:56-56.
https://hdl.handle.net/21.15107/rcub_vinar_12083 .

Vujasin, Radojka, Kumrić, Ksenija, Devečerski, Aleksandar, Omerašević, Mia, Egerić, Marija, Petrović, Đorđe Ž., Matović, Ljiljana, "Water under extreme conditions: simultaneous gamma irradiation/carbon char adsorption resulted in improved methylene blue degradation" in IMEC 2022 : 1st Intentational conference on innovativ materials in extreme conditions : Program and Book of abstracts (2022):56-56,
https://hdl.handle.net/21.15107/rcub_vinar_12083 .

TY  - CONF
AU  - Egerić, Marija
AU  - Kumrić, Ksenija
AU  - Vujasin, Radojka
AU  - Devečerski, Aleksandar
AU  - Krstić, Sanja
AU  - Matović, Ljiljana
AU  - Petrović, Đorđe Ž.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12084
AB  - Rapid industrialization and increasing population have increased the water demand. Various wastes from industries and anthropogenic activities are discharged into aquatic bodies such as lakes, ponds, rivers, oceans. Therefore, focus is placed on the removal of the contamination from the wastewater. Organic pollutants gained extensive attention because of their toxicity, persistence and significant impacts on human health Among them, organic dyes are complex molecules and most of them are water-soluble, resistant to detergents and heat, exhibit poor biodegradability, etc. Azo dyes are used in about 70% of commercial dyes today, from textile and plastic to cosmetics and food. In this work, removal of azo-type dye Congo Red (CR) from water was performed by using UiO-66 type MOF (Metal Organic Framework), activated carbon (AC) and their composite powder mixture (MOF/AC = 50/50 wt.%). Samples were exposed to solar light irradiation for 1h and 2.5 h, respectively, centrifuged to remove solid particles, and solutions were analyzed by UV-ViS spectrophotometer in order to determine the concentration of the remaining dye. Process was repeated three times in order to explore the renewability of the photocatalysts used, with catalysts dried at 50 °C between cycles. Results revieled superior photocatalytic cycling performance of the MOF compared to the MOF/AC composite, while AC showed decline in dye removal performance due to the saturation of available adsorption sites. MOF/AC composite exhibited beneficial cost/performance ratio.
PB  - University of Belgrade : Institute for Multidisciplinary Research
C3  - 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade
T1  - Enhanced photocatalytic removal of Congo red by MOF-activated carbon composite
SP  - 58
EP  - 58
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12084
ER  - 

@conference{
author = "Egerić, Marija and Kumrić, Ksenija and Vujasin, Radojka and Devečerski, Aleksandar and Krstić, Sanja and Matović, Ljiljana and Petrović, Đorđe Ž.",
year = "2022",
abstract = "Rapid industrialization and increasing population have increased the water demand. Various wastes from industries and anthropogenic activities are discharged into aquatic bodies such as lakes, ponds, rivers, oceans. Therefore, focus is placed on the removal of the contamination from the wastewater. Organic pollutants gained extensive attention because of their toxicity, persistence and significant impacts on human health Among them, organic dyes are complex molecules and most of them are water-soluble, resistant to detergents and heat, exhibit poor biodegradability, etc. Azo dyes are used in about 70% of commercial dyes today, from textile and plastic to cosmetics and food. In this work, removal of azo-type dye Congo Red (CR) from water was performed by using UiO-66 type MOF (Metal Organic Framework), activated carbon (AC) and their composite powder mixture (MOF/AC = 50/50 wt.%). Samples were exposed to solar light irradiation for 1h and 2.5 h, respectively, centrifuged to remove solid particles, and solutions were analyzed by UV-ViS spectrophotometer in order to determine the concentration of the remaining dye. Process was repeated three times in order to explore the renewability of the photocatalysts used, with catalysts dried at 50 °C between cycles. Results revieled superior photocatalytic cycling performance of the MOF compared to the MOF/AC composite, while AC showed decline in dye removal performance due to the saturation of available adsorption sites. MOF/AC composite exhibited beneficial cost/performance ratio.",
publisher = "University of Belgrade : Institute for Multidisciplinary Research",
journal = "6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade",
title = "Enhanced photocatalytic removal of Congo red by MOF-activated carbon composite",
pages = "58-58",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12084"
}

Egerić, M., Kumrić, K., Vujasin, R., Devečerski, A., Krstić, S., Matović, L.,& Petrović, Đ. Ž.. (2022). Enhanced photocatalytic removal of Congo red by MOF-activated carbon composite. in 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade
University of Belgrade : Institute for Multidisciplinary Research., 58-58.
https://hdl.handle.net/21.15107/rcub_vinar_12084

Egerić M, Kumrić K, Vujasin R, Devečerski A, Krstić S, Matović L, Petrović ĐŽ. Enhanced photocatalytic removal of Congo red by MOF-activated carbon composite. in 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade. 2022;:58-58.
https://hdl.handle.net/21.15107/rcub_vinar_12084 .

Egerić, Marija, Kumrić, Ksenija, Vujasin, Radojka, Devečerski, Aleksandar, Krstić, Sanja, Matović, Ljiljana, Petrović, Đorđe Ž., "Enhanced photocatalytic removal of Congo red by MOF-activated carbon composite" in 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade (2022):58-58,
https://hdl.handle.net/21.15107/rcub_vinar_12084 .

TY  - CONF
AU  - Krstić, Sanja S.
AU  - Dodevski, Vladimir
AU  - Čokeša, Đuro
AU  - Devečerski, Aleksandar
AU  - Vujasin, Radojka
AU  - Kumrić, Ksenija
AU  - Kaluđerović, Branka V.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10781
AB  - Carbon material with active surface properties have been synthesized by hydrothermal method from fructose using 40% and 80% phosphoric acid (H3 PO4 ) solution, at temperature of 260°C and fructose concentration of 2M. The aim of this investigation was active carbon material synthesis which is completed by one step reaction, which was not the case in our previous works. Thus, compared with other samples from our works, this way is more economic and faster since both reaction of carbonization and activation was finished in one step. The hydrothermal process, in general, includes heat treatment of carbohydrate solutions under autogenous pressure at low temperatures (150–260 °C). Obtained solid carbon material has uniform morphology, amorphous structure and high content of oxygen functional groups. Prepared active carbon material is made up of spherical microsphere particles with the diameter in the range of 0.6-2.7 μm. The morphology and surface properties of obtained material were characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectra. Adsorption and desorption isotherms of N2 were measured on carbon containing material at -196 °C using the gravimetric McBain method. Adsorption from aqueous solutions of Methylene Blue (MB) onto prepared carbon material was conducted by changing concentration of MB from 200-500mg/dm3 . The best fit of the kinetic results was achieved by a pseudo second-order equation. Also, this nature of material is applicable in other systems regarding environmental protection and dye pollution prevention.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade
T1  - Preparation and Characterization Of Active Carbon Microspheres Obtained From Fructose And Adsorption Application
SP  - 38
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10781
ER  - 

@conference{
author = "Krstić, Sanja S. and Dodevski, Vladimir and Čokeša, Đuro and Devečerski, Aleksandar and Vujasin, Radojka and Kumrić, Ksenija and Kaluđerović, Branka V.",
year = "2021",
abstract = "Carbon material with active surface properties have been synthesized by hydrothermal method from fructose using 40% and 80% phosphoric acid (H3 PO4 ) solution, at temperature of 260°C and fructose concentration of 2M. The aim of this investigation was active carbon material synthesis which is completed by one step reaction, which was not the case in our previous works. Thus, compared with other samples from our works, this way is more economic and faster since both reaction of carbonization and activation was finished in one step. The hydrothermal process, in general, includes heat treatment of carbohydrate solutions under autogenous pressure at low temperatures (150–260 °C). Obtained solid carbon material has uniform morphology, amorphous structure and high content of oxygen functional groups. Prepared active carbon material is made up of spherical microsphere particles with the diameter in the range of 0.6-2.7 μm. The morphology and surface properties of obtained material were characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectra. Adsorption and desorption isotherms of N2 were measured on carbon containing material at -196 °C using the gravimetric McBain method. Adsorption from aqueous solutions of Methylene Blue (MB) onto prepared carbon material was conducted by changing concentration of MB from 200-500mg/dm3 . The best fit of the kinetic results was achieved by a pseudo second-order equation. Also, this nature of material is applicable in other systems regarding environmental protection and dye pollution prevention.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade",
title = "Preparation and Characterization Of Active Carbon Microspheres Obtained From Fructose And Adsorption Application",
pages = "38",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10781"
}

Krstić, S. S., Dodevski, V., Čokeša, Đ., Devečerski, A., Vujasin, R., Kumrić, K.,& Kaluđerović, B. V.. (2021). Preparation and Characterization Of Active Carbon Microspheres Obtained From Fructose And Adsorption Application. in Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade
Belgrade : Serbian Ceramic Society., 38.
https://hdl.handle.net/21.15107/rcub_vinar_10781

Krstić SS, Dodevski V, Čokeša Đ, Devečerski A, Vujasin R, Kumrić K, Kaluđerović BV. Preparation and Characterization Of Active Carbon Microspheres Obtained From Fructose And Adsorption Application. in Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade. 2021;:38.
https://hdl.handle.net/21.15107/rcub_vinar_10781 .

Krstić, Sanja S., Dodevski, Vladimir, Čokeša, Đuro, Devečerski, Aleksandar, Vujasin, Radojka, Kumrić, Ksenija, Kaluđerović, Branka V., "Preparation and Characterization Of Active Carbon Microspheres Obtained From Fructose And Adsorption Application" in Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade (2021):38,
https://hdl.handle.net/21.15107/rcub_vinar_10781 .

TY  - CONF
AU  - Krstić, Sanja S.
AU  - Dodevski, Vladimir
AU  - Čokeša, Đuro
AU  - Devečerski, Aleksandar
AU  - Vujasin, Radojka
AU  - Kumrić, Ksenija
AU  - Kaluđerović, Branka V.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10841
AB  - A carbon-rich solid product has been synthesized by hydrothermal treatment from fructose with phosphoric acid (H3 PO4 ) at temperature of 250°C and pH value of 0.65. The concentration of the precursor was constant, i.e. 2M of fructose in form of aqueous solution. The formation of the carbon-rich solid material through the hydrothermal carbonization of fructose is the consequence of dehydration reactions. Obtained carbon material is made of spherical micrometer-sized particles with the diameter in the 4-7 μm. The structure and surface chemical properties of obtained material were characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectra. Investigation of surface area was determined by gravimetric McBain method where adsorption and desorption isotherms of N2 were measured on carbon material at -196 °C. Adsorption of Methylene Blue (MB) onto prepared carbon material were conducted by changing concentration of MB from 200-500 mg/dm 3 from aqueous solutions of investigated dye. Kinetic results were determined by a pseudo second-order equation.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade
T1  - Preparation and Characterization of Active Carbon Microspheres Obtained from Fructose and Adsorption Application
SP  - 81
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10841
ER  - 

@conference{
author = "Krstić, Sanja S. and Dodevski, Vladimir and Čokeša, Đuro and Devečerski, Aleksandar and Vujasin, Radojka and Kumrić, Ksenija and Kaluđerović, Branka V.",
year = "2021",
abstract = "A carbon-rich solid product has been synthesized by hydrothermal treatment from fructose with phosphoric acid (H3 PO4 ) at temperature of 250°C and pH value of 0.65. The concentration of the precursor was constant, i.e. 2M of fructose in form of aqueous solution. The formation of the carbon-rich solid material through the hydrothermal carbonization of fructose is the consequence of dehydration reactions. Obtained carbon material is made of spherical micrometer-sized particles with the diameter in the 4-7 μm. The structure and surface chemical properties of obtained material were characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectra. Investigation of surface area was determined by gravimetric McBain method where adsorption and desorption isotherms of N2 were measured on carbon material at -196 °C. Adsorption of Methylene Blue (MB) onto prepared carbon material were conducted by changing concentration of MB from 200-500 mg/dm 3 from aqueous solutions of investigated dye. Kinetic results were determined by a pseudo second-order equation.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade",
title = "Preparation and Characterization of Active Carbon Microspheres Obtained from Fructose and Adsorption Application",
pages = "81",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10841"
}

Krstić, S. S., Dodevski, V., Čokeša, Đ., Devečerski, A., Vujasin, R., Kumrić, K.,& Kaluđerović, B. V.. (2021). Preparation and Characterization of Active Carbon Microspheres Obtained from Fructose and Adsorption Application. in Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade
Belgrade : Serbian Ceramic Society., 81.
https://hdl.handle.net/21.15107/rcub_vinar_10841

Krstić SS, Dodevski V, Čokeša Đ, Devečerski A, Vujasin R, Kumrić K, Kaluđerović BV. Preparation and Characterization of Active Carbon Microspheres Obtained from Fructose and Adsorption Application. in Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade. 2021;:81.
https://hdl.handle.net/21.15107/rcub_vinar_10841 .

Krstić, Sanja S., Dodevski, Vladimir, Čokeša, Đuro, Devečerski, Aleksandar, Vujasin, Radojka, Kumrić, Ksenija, Kaluđerović, Branka V., "Preparation and Characterization of Active Carbon Microspheres Obtained from Fructose and Adsorption Application" in Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade (2021):81,
https://hdl.handle.net/21.15107/rcub_vinar_10841 .

TY  - CONF
AU  - Stanković, Katarina
AU  - Petrović, Đ.
AU  - Telečki, Igor
AU  - Vujasin, Radojka
AU  - Matović, Ljiljana
AU  - Devečerski, Aleksandar
AU  - Kumrić, Ksenija
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12078
AB  - Chitosan and its modified forms have received great attention as potential adsorbents due to its outstanding adsorption characteristics toward removal of vaious toxic heavy metal ions from aqueous solutions. In this work, a porous chitosan hydrogel beads (CHB) and CHB cross-linked with glutaraldehyde (GLA) and citric acid (CA) were synthesized and used for investigation of its adsorption performances toward the removal of Pb(II), Cu(II), Zn(II), Cd(II) and Cr(VI) ions from water in batch and dynamic systems. Maximum removal was achieved in the pH ranges of 4.0 - 6.5 and 2.0 - 3.5 for divalent cations and Cr(VI) oxyanion, respectively. The equilibrium adsorption data were best fitted by the Langmuir isotherm model. Based on the optimal conditions, the fixed-bed breakthrough curves for the removal of the studied metal ions from the aqueous solutions using fixedbed columns were experimentally evaluated, as well as theoretically predicted using COMSOL Multiphysics software.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry
T1  - Development of chitosan-based hydrogel beads for heavy metals removal from aqueous solutions
VL  - II
SP  - 588
EP  - 591
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12078
ER  - 

@conference{
author = "Stanković, Katarina and Petrović, Đ. and Telečki, Igor and Vujasin, Radojka and Matović, Ljiljana and Devečerski, Aleksandar and Kumrić, Ksenija",
year = "2021",
abstract = "Chitosan and its modified forms have received great attention as potential adsorbents due to its outstanding adsorption characteristics toward removal of vaious toxic heavy metal ions from aqueous solutions. In this work, a porous chitosan hydrogel beads (CHB) and CHB cross-linked with glutaraldehyde (GLA) and citric acid (CA) were synthesized and used for investigation of its adsorption performances toward the removal of Pb(II), Cu(II), Zn(II), Cd(II) and Cr(VI) ions from water in batch and dynamic systems. Maximum removal was achieved in the pH ranges of 4.0 - 6.5 and 2.0 - 3.5 for divalent cations and Cr(VI) oxyanion, respectively. The equilibrium adsorption data were best fitted by the Langmuir isotherm model. Based on the optimal conditions, the fixed-bed breakthrough curves for the removal of the studied metal ions from the aqueous solutions using fixedbed columns were experimentally evaluated, as well as theoretically predicted using COMSOL Multiphysics software.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry",
title = "Development of chitosan-based hydrogel beads for heavy metals removal from aqueous solutions",
volume = "II",
pages = "588-591",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12078"
}

Stanković, K., Petrović, Đ., Telečki, I., Vujasin, R., Matović, L., Devečerski, A.,& Kumrić, K.. (2021). Development of chitosan-based hydrogel beads for heavy metals removal from aqueous solutions. in Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., II, 588-591.
https://hdl.handle.net/21.15107/rcub_vinar_12078

Stanković K, Petrović Đ, Telečki I, Vujasin R, Matović L, Devečerski A, Kumrić K. Development of chitosan-based hydrogel beads for heavy metals removal from aqueous solutions. in Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry. 2021;II:588-591.
https://hdl.handle.net/21.15107/rcub_vinar_12078 .

Stanković, Katarina, Petrović, Đ., Telečki, Igor, Vujasin, Radojka, Matović, Ljiljana, Devečerski, Aleksandar, Kumrić, Ksenija, "Development of chitosan-based hydrogel beads for heavy metals removal from aqueous solutions" in Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry, II (2021):588-591,
https://hdl.handle.net/21.15107/rcub_vinar_12078 .

TY  - CONF
AU  - Kumrić, Ksenija
AU  - Vujasin, Radojka
AU  - Egerić, Marija
AU  - Petrović, Đ.
AU  - Stanković, Katarina
AU  - Devečerski, Aleksandar
AU  - Matović, Ljiljana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12077
AB  - An analytical method based on solid-phase extraction (SPE) using coconut shell activated carbon (CSAC) as a low-cost adsorbent and high performance liquid chromatography with diode array detector (HPLC-DAD) was developed and validated for the determination of four varying polarity pesticides in water samples. SPE procedure was optimized and under the optimized conditions the proposed method was validated. The method exhibited good linearity, satisfactory precision (1.4 – 5.1%), high enrichment factor, good recovery and low limits of detection (0.025 – 0.039 g/dm3 ). Optimized method was used to determine selected pesticides in tap water samples. The recoveries ranged from 58.2% to 105.3%, with low relative standard deviations. The obtained results indicated that the proposed SPE-HPLC-DAD method could be efficiently used for the determination of the selected pesticides in environmental water samples at trace levels.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry
T1  - Development and validation of a SPE-HPLC-DAD method for the determination of selected pesticides in water samples
VL  - II
SP  - 584
EP  - 587
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12077
ER  - 

@conference{
author = "Kumrić, Ksenija and Vujasin, Radojka and Egerić, Marija and Petrović, Đ. and Stanković, Katarina and Devečerski, Aleksandar and Matović, Ljiljana",
year = "2021",
abstract = "An analytical method based on solid-phase extraction (SPE) using coconut shell activated carbon (CSAC) as a low-cost adsorbent and high performance liquid chromatography with diode array detector (HPLC-DAD) was developed and validated for the determination of four varying polarity pesticides in water samples. SPE procedure was optimized and under the optimized conditions the proposed method was validated. The method exhibited good linearity, satisfactory precision (1.4 – 5.1%), high enrichment factor, good recovery and low limits of detection (0.025 – 0.039 g/dm3 ). Optimized method was used to determine selected pesticides in tap water samples. The recoveries ranged from 58.2% to 105.3%, with low relative standard deviations. The obtained results indicated that the proposed SPE-HPLC-DAD method could be efficiently used for the determination of the selected pesticides in environmental water samples at trace levels.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry",
title = "Development and validation of a SPE-HPLC-DAD method for the determination of selected pesticides in water samples",
volume = "II",
pages = "584-587",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12077"
}

Kumrić, K., Vujasin, R., Egerić, M., Petrović, Đ., Stanković, K., Devečerski, A.,& Matović, L.. (2021). Development and validation of a SPE-HPLC-DAD method for the determination of selected pesticides in water samples. in Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., II, 584-587.
https://hdl.handle.net/21.15107/rcub_vinar_12077

Kumrić K, Vujasin R, Egerić M, Petrović Đ, Stanković K, Devečerski A, Matović L. Development and validation of a SPE-HPLC-DAD method for the determination of selected pesticides in water samples. in Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry. 2021;II:584-587.
https://hdl.handle.net/21.15107/rcub_vinar_12077 .

Kumrić, Ksenija, Vujasin, Radojka, Egerić, Marija, Petrović, Đ., Stanković, Katarina, Devečerski, Aleksandar, Matović, Ljiljana, "Development and validation of a SPE-HPLC-DAD method for the determination of selected pesticides in water samples" in Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry, II (2021):584-587,
https://hdl.handle.net/21.15107/rcub_vinar_12077 .

TY  - CONF
AU  - Devečerski, Aleksandar
AU  - Kumrić, Ksenija
AU  - Stanković, S.
AU  - Egerić, Marija
AU  - Omerašević, Mia
AU  - Krstić, Sanja
AU  - Vujasin, Radojka
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12076
AB  - Hazardous industrial wastes are the most common source of environmental pollution. Waters originating from unregulated landfills and places of inadequate disposal of this type of wastes can pollute the water sources and affect the human health. In this study, electroplating waste sludge (ES) and various Fe-rich wastes were used as starting materials for the synthesis of inorganic pigments. Obtained black Cr1.3Fe0.7O3 pigments possess adequate properties required for use as inorganic pigments.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry
T1  - Black inorganic pigments obtained from waste materials
VL  - II
SP  - 580
EP  - 583
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12076
ER  - 

@conference{
author = "Devečerski, Aleksandar and Kumrić, Ksenija and Stanković, S. and Egerić, Marija and Omerašević, Mia and Krstić, Sanja and Vujasin, Radojka",
year = "2021",
abstract = "Hazardous industrial wastes are the most common source of environmental pollution. Waters originating from unregulated landfills and places of inadequate disposal of this type of wastes can pollute the water sources and affect the human health. In this study, electroplating waste sludge (ES) and various Fe-rich wastes were used as starting materials for the synthesis of inorganic pigments. Obtained black Cr1.3Fe0.7O3 pigments possess adequate properties required for use as inorganic pigments.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry",
title = "Black inorganic pigments obtained from waste materials",
volume = "II",
pages = "580-583",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12076"
}

Devečerski, A., Kumrić, K., Stanković, S., Egerić, M., Omerašević, M., Krstić, S.,& Vujasin, R.. (2021). Black inorganic pigments obtained from waste materials. in Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., II, 580-583.
https://hdl.handle.net/21.15107/rcub_vinar_12076

Devečerski A, Kumrić K, Stanković S, Egerić M, Omerašević M, Krstić S, Vujasin R. Black inorganic pigments obtained from waste materials. in Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry. 2021;II:580-583.
https://hdl.handle.net/21.15107/rcub_vinar_12076 .

Devečerski, Aleksandar, Kumrić, Ksenija, Stanković, S., Egerić, Marija, Omerašević, Mia, Krstić, Sanja, Vujasin, Radojka, "Black inorganic pigments obtained from waste materials" in Physical chemistry 2021 : 15th international conference on fundamental and applied aspects of physical chemistry, II (2021):580-583,
https://hdl.handle.net/21.15107/rcub_vinar_12076 .

TY  - JOUR
AU  - Matović, Ljiljana
AU  - Vujasin, Radojka
AU  - Kumrić, Ksenija
AU  - Krstić, Sanja S.
AU  - Wu, Yi-nan
AU  - Kabtamu, Daniel Manaye
AU  - Devečerski, Aleksandar
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9545
AB  - Development of method for the complete conversion of Cr-containing electroplating sludge (ES) into the black inorganic pigment was presented. Difficulties related to the ES complex, variable composition and inhomogeneity, where the dominant presence of Cr was followed by: Fe, P, Zn, Ni, Cu, etc., can be overcome by determination of the precise amount of Fe2O3 necessary to be added in order to firmly embed all the heavy metals into the pigment structure (i.e. the Fe0.7Cr1.3O3/FePO4 nanocomposite), taking care not only about weight/molar ratios, but also about average particle size, apparent densities, and volume fraction of the starting materials. As a source of Fe2O3, commercial (p.a.) Fe2O3 and two different Fe-wastes were used, thus completely fulfilling the principles of the circular economy. The obtained black inorganic pigments have consistent composition, no leaching of toxic metals, color (CIE L-a-b-values) comparable with those of commercial pigments and thus have the potential commercial large scale application. © 2021 Elsevier Ltd.
T2  - Journal of Environmental Chemical Engineering
T1  - Designing of technological scheme for conversion of Cr-rich electroplating sludge into the black ceramic pigments of consistent composition, following the principles of circular economy
VL  - 9
IS  - 1
SP  - 105038
DO  - 10.1016/j.jece.2021.105038
ER  - 

@article{
author = "Matović, Ljiljana and Vujasin, Radojka and Kumrić, Ksenija and Krstić, Sanja S. and Wu, Yi-nan and Kabtamu, Daniel Manaye and Devečerski, Aleksandar",
year = "2021",
abstract = "Development of method for the complete conversion of Cr-containing electroplating sludge (ES) into the black inorganic pigment was presented. Difficulties related to the ES complex, variable composition and inhomogeneity, where the dominant presence of Cr was followed by: Fe, P, Zn, Ni, Cu, etc., can be overcome by determination of the precise amount of Fe2O3 necessary to be added in order to firmly embed all the heavy metals into the pigment structure (i.e. the Fe0.7Cr1.3O3/FePO4 nanocomposite), taking care not only about weight/molar ratios, but also about average particle size, apparent densities, and volume fraction of the starting materials. As a source of Fe2O3, commercial (p.a.) Fe2O3 and two different Fe-wastes were used, thus completely fulfilling the principles of the circular economy. The obtained black inorganic pigments have consistent composition, no leaching of toxic metals, color (CIE L-a-b-values) comparable with those of commercial pigments and thus have the potential commercial large scale application. © 2021 Elsevier Ltd.",
journal = "Journal of Environmental Chemical Engineering",
title = "Designing of technological scheme for conversion of Cr-rich electroplating sludge into the black ceramic pigments of consistent composition, following the principles of circular economy",
volume = "9",
number = "1",
pages = "105038",
doi = "10.1016/j.jece.2021.105038"
}

Matović, L., Vujasin, R., Kumrić, K., Krstić, S. S., Wu, Y., Kabtamu, D. M.,& Devečerski, A.. (2021). Designing of technological scheme for conversion of Cr-rich electroplating sludge into the black ceramic pigments of consistent composition, following the principles of circular economy. in Journal of Environmental Chemical Engineering, 9(1), 105038.
https://doi.org/10.1016/j.jece.2021.105038

Matović L, Vujasin R, Kumrić K, Krstić SS, Wu Y, Kabtamu DM, Devečerski A. Designing of technological scheme for conversion of Cr-rich electroplating sludge into the black ceramic pigments of consistent composition, following the principles of circular economy. in Journal of Environmental Chemical Engineering. 2021;9(1):105038.
doi:10.1016/j.jece.2021.105038 .

Matović, Ljiljana, Vujasin, Radojka, Kumrić, Ksenija, Krstić, Sanja S., Wu, Yi-nan, Kabtamu, Daniel Manaye, Devečerski, Aleksandar, "Designing of technological scheme for conversion of Cr-rich electroplating sludge into the black ceramic pigments of consistent composition, following the principles of circular economy" in Journal of Environmental Chemical Engineering, 9, no. 1 (2021):105038,
https://doi.org/10.1016/j.jece.2021.105038 . .

TY  - JOUR
AU  - Matović, Ljiljana
AU  - Vujasin, Radojka
AU  - Kumrić, Ksenija
AU  - Devečerski, Aleksandar
AU  - Wu, Yi-nan 
AU  - Kabtamu, Daniel M.
AU  - Mirković, Marija D.
AU  - Omerašević, Mia
AU  - Petrović, Đorđe
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9791
AB  - Enhanced degradation of organic dye was achieved using two different kinds of waste materials: waste tire granules and spent sealed radioactive sources. Waste tire granules were used as raw material for the production of waste tire char (WTC), which was further utilized as an adsorbent matrix for synergetic adsorption/irradiation degradation of organic dye. The spent radioactive sources were radiographic sealed sources that originate from the industry which generate the high energy radiation. Methylene Blue (MB) was used as an organic model compound. Synthesized WTC has turbostratic structure, irregular shaped particles and developed mesoporous surface. Complete degradation of 0.02 dm3 of 100 mg dm−3 MB solution, having WTC dose of 1.25 g dm−3, was achieved with delivered doze of only 60 Gy. The applied doses were 100 times smaller than those presented in the literature. Degradation pathway was determined: OH radicals that originate from radiolysis of water and from the surface of WTC played the crucial role in the radiocatalytic degradation of MB. Breakage of the aromatic ring of MB appeared by the scission of the double C‒S+˭C bond as a result of the attack of OH species on adsorbed and electronically reorganized MB molecule. © 2020 Elsevier B.V.
T2  - Journal of Hazardous Materials
T1  - Waste tire carbon in synergetic interaction with spent gamma radioactive source for efficient radiocatalytic degradation of organic dye
VL  - 408
DO  - 10.1016/j.jhazmat.2020.124922
ER  - 

@article{
author = "Matović, Ljiljana and Vujasin, Radojka and Kumrić, Ksenija and Devečerski, Aleksandar and Wu, Yi-nan  and Kabtamu, Daniel M. and Mirković, Marija D. and Omerašević, Mia and Petrović, Đorđe",
year = "2021",
abstract = "Enhanced degradation of organic dye was achieved using two different kinds of waste materials: waste tire granules and spent sealed radioactive sources. Waste tire granules were used as raw material for the production of waste tire char (WTC), which was further utilized as an adsorbent matrix for synergetic adsorption/irradiation degradation of organic dye. The spent radioactive sources were radiographic sealed sources that originate from the industry which generate the high energy radiation. Methylene Blue (MB) was used as an organic model compound. Synthesized WTC has turbostratic structure, irregular shaped particles and developed mesoporous surface. Complete degradation of 0.02 dm3 of 100 mg dm−3 MB solution, having WTC dose of 1.25 g dm−3, was achieved with delivered doze of only 60 Gy. The applied doses were 100 times smaller than those presented in the literature. Degradation pathway was determined: OH radicals that originate from radiolysis of water and from the surface of WTC played the crucial role in the radiocatalytic degradation of MB. Breakage of the aromatic ring of MB appeared by the scission of the double C‒S+˭C bond as a result of the attack of OH species on adsorbed and electronically reorganized MB molecule. © 2020 Elsevier B.V.",
journal = "Journal of Hazardous Materials",
title = "Waste tire carbon in synergetic interaction with spent gamma radioactive source for efficient radiocatalytic degradation of organic dye",
volume = "408",
doi = "10.1016/j.jhazmat.2020.124922"
}

Matović, L., Vujasin, R., Kumrić, K., Devečerski, A., Wu, Y., Kabtamu, D. M., Mirković, M. D., Omerašević, M.,& Petrović, Đ.. (2021). Waste tire carbon in synergetic interaction with spent gamma radioactive source for efficient radiocatalytic degradation of organic dye. in Journal of Hazardous Materials, 408.
https://doi.org/10.1016/j.jhazmat.2020.124922

Matović L, Vujasin R, Kumrić K, Devečerski A, Wu Y, Kabtamu DM, Mirković MD, Omerašević M, Petrović Đ. Waste tire carbon in synergetic interaction with spent gamma radioactive source for efficient radiocatalytic degradation of organic dye. in Journal of Hazardous Materials. 2021;408.
doi:10.1016/j.jhazmat.2020.124922 .

Matović, Ljiljana, Vujasin, Radojka, Kumrić, Ksenija, Devečerski, Aleksandar, Wu, Yi-nan , Kabtamu, Daniel M., Mirković, Marija D., Omerašević, Mia, Petrović, Đorđe, "Waste tire carbon in synergetic interaction with spent gamma radioactive source for efficient radiocatalytic degradation of organic dye" in Journal of Hazardous Materials, 408 (2021),
https://doi.org/10.1016/j.jhazmat.2020.124922 . .

TY  - CONF
AU  - Petrović, Đorđe Ž.
AU  - Kumrić, Ksenija
AU  - Mirković, Marija D.
AU  - Ilić-Stojanović, Snežana
AU  - Matović, Ljiljana
AU  - Eraković, Zorica
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12080
AB  - The use of high energy, ionizing radiation in nuclear medicine is now pervasive and routine. The interaction of gamma radiation with aqueous solutions produces different kinds of reducing and oxidizing agents. Reducing agents represent eaq, H• and H2 while oxidizing agents represent H2O2, •OH, O2, O2 - and HO2 [1]. Production of such species under gamma irradiation, there may affect the rates or mechanisms of corrosion attack modes. In recent times, electrochemical frequency modulation (EFM) has caught the attention of corrosion scientists as a rapid and non–destructive technique for the instantaneous determination of corrosion rate. The advantage of the EFM technique is the fact that the measurement can be completed in a short time period [2]. The EFM technique offers an excellent alternative for the analysis of electrochemical corrosion behavior of metals compared with contemporary techniques like potentiodynamic polarization, linear polarization, electrochemical impedance spectroscopy and weight loss. This technique provides measurements of corrosion rate directly without knowledge of the Tafel constants. Even though the Tafel constants are not required, it measures them and a change in Tafel constant may indicate a change in corrosion mechanism. The theory behind the technique is the same Butler-Volmer kinetics that underpins all corrosion rate measurements. It is a small signal ac technique where two sine waves (at different frequencies) are applied to the cell simultaneously. In our work, we used the EFM technique to calculate the corrosion rate on stainless steel samples in saline and under gamma radiation.
AB  - Nerđajući čelici su omiljeni materijali u nuklearnoj medicini zbog jednostavnog održavanja (brisanje, dekontaminacija, itd.). Otpornost na rđanje ovih materijala je smanjena usled istovremenog delovanja hloridnih jona i jonizujućeg zračenja. Brza i nedestruktivna tehnika merenja korozije, kao što je elektrohemijska frekvenciona modulacija (EFM), korisna je za brzu procenu materijala koji moraju biti otporni na rđаnje. Tri različite cevi od nerđajućeg čelika su analizirane pomoću EFM metode i Gamry potenciostata / galvanostata, i izračunate su njihove brzine korozije. Uzorak označen kao S II, koji ne sadrži Mo u svom sastavu pokazuje veću brzinu korozije u odnosu na uzorke koji sadrže Mo ako je istovremeno izložen hloridnim jonima i gama zračenju. Ovaj rezultat je u sagalsnosti sa sastavom nerdjajučćeg čelika dobijenim rentgenskim fluorescentnim spektrometrom koji pokazuje nedostatak bakra i vanadijuma u tragovima, uključujući molibden.
PB  - Belgrade : Serbian Chemical Society
C3  - 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings
T1  - Corrosion Rate of Stainless Steel Tubes Calculated by Electrochemical Frequency Modulation
T1  - Brzina korozije cevi od nerđajućih čelika izračunata pomoću elektrohemijske frekvencione modulacije
SP  - 108
EP  - 113
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12080
ER  - 

@conference{
author = "Petrović, Đorđe Ž. and Kumrić, Ksenija and Mirković, Marija D. and Ilić-Stojanović, Snežana and Matović, Ljiljana and Eraković, Zorica",
year = "2021",
abstract = "The use of high energy, ionizing radiation in nuclear medicine is now pervasive and routine. The interaction of gamma radiation with aqueous solutions produces different kinds of reducing and oxidizing agents. Reducing agents represent eaq, H• and H2 while oxidizing agents represent H2O2, •OH, O2, O2 - and HO2 [1]. Production of such species under gamma irradiation, there may affect the rates or mechanisms of corrosion attack modes. In recent times, electrochemical frequency modulation (EFM) has caught the attention of corrosion scientists as a rapid and non–destructive technique for the instantaneous determination of corrosion rate. The advantage of the EFM technique is the fact that the measurement can be completed in a short time period [2]. The EFM technique offers an excellent alternative for the analysis of electrochemical corrosion behavior of metals compared with contemporary techniques like potentiodynamic polarization, linear polarization, electrochemical impedance spectroscopy and weight loss. This technique provides measurements of corrosion rate directly without knowledge of the Tafel constants. Even though the Tafel constants are not required, it measures them and a change in Tafel constant may indicate a change in corrosion mechanism. The theory behind the technique is the same Butler-Volmer kinetics that underpins all corrosion rate measurements. It is a small signal ac technique where two sine waves (at different frequencies) are applied to the cell simultaneously. In our work, we used the EFM technique to calculate the corrosion rate on stainless steel samples in saline and under gamma radiation., Nerđajući čelici su omiljeni materijali u nuklearnoj medicini zbog jednostavnog održavanja (brisanje, dekontaminacija, itd.). Otpornost na rđanje ovih materijala je smanjena usled istovremenog delovanja hloridnih jona i jonizujućeg zračenja. Brza i nedestruktivna tehnika merenja korozije, kao što je elektrohemijska frekvenciona modulacija (EFM), korisna je za brzu procenu materijala koji moraju biti otporni na rđаnje. Tri različite cevi od nerđajućeg čelika su analizirane pomoću EFM metode i Gamry potenciostata / galvanostata, i izračunate su njihove brzine korozije. Uzorak označen kao S II, koji ne sadrži Mo u svom sastavu pokazuje veću brzinu korozije u odnosu na uzorke koji sadrže Mo ako je istovremeno izložen hloridnim jonima i gama zračenju. Ovaj rezultat je u sagalsnosti sa sastavom nerdjajučćeg čelika dobijenim rentgenskim fluorescentnim spektrometrom koji pokazuje nedostatak bakra i vanadijuma u tragovima, uključujući molibden.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings",
title = "Corrosion Rate of Stainless Steel Tubes Calculated by Electrochemical Frequency Modulation, Brzina korozije cevi od nerđajućih čelika izračunata pomoću elektrohemijske frekvencione modulacije",
pages = "108-113",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12080"
}

Petrović, Đ. Ž., Kumrić, K., Mirković, M. D., Ilić-Stojanović, S., Matović, L.,& Eraković, Z.. (2021). Corrosion Rate of Stainless Steel Tubes Calculated by Electrochemical Frequency Modulation. in 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings
Belgrade : Serbian Chemical Society., 108-113.
https://hdl.handle.net/21.15107/rcub_vinar_12080

Petrović ĐŽ, Kumrić K, Mirković MD, Ilić-Stojanović S, Matović L, Eraković Z. Corrosion Rate of Stainless Steel Tubes Calculated by Electrochemical Frequency Modulation. in 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings. 2021;:108-113.
https://hdl.handle.net/21.15107/rcub_vinar_12080 .

Petrović, Đorđe Ž., Kumrić, Ksenija, Mirković, Marija D., Ilić-Stojanović, Snežana, Matović, Ljiljana, Eraković, Zorica, "Corrosion Rate of Stainless Steel Tubes Calculated by Electrochemical Frequency Modulation" in 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings (2021):108-113,
https://hdl.handle.net/21.15107/rcub_vinar_12080 .

TY  - CONF
AU  - Stanković, Katarina
AU  - Vujasin, Radojka
AU  - Egerić, Marija
AU  - Matović, Ljiljana
AU  - Petrović, Đorđe Ž.
AU  - Kumrić, Ksenija
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12081
AB  - Most heavy metals, such as Cr (chromium), Pb (lead), Cd (cadmium), Ni (nickel), Cu (copper) and Fe (iron), are extremely toxic above a tolerance limit. These heavy metals in wastewater are not biodegradable and can cause serious harm to human health and ecological environments.1 One of the top-priority toxic heavy metal in wastewater is chromium.2 In natural waters, chromium exists in both trivalent Cr(III) and hexavalent Cr(VI) forms. Cr(VI) is the most toxic one and have the tolerance limit 0.1 mg/L into surface water and 0.05 mg/L in potable water.3 Various methods, such as ion exchange, sedimentation, electrochemical process, cementation, coagulation, adsorption and solvent extraction have been developed for the removal of Cr(VI) and other toxic metals from wastewater.4 Among these methods, in some papers,5-8 adsorption has been used as one of the most effective method for the removal of Cr(VI) from aqueous solutions. Characteristics of adsorption, such as low cost, easy to perform, efficient and reversible method with high operating speed, make this method as most commonly used for the removal of Cr(VI) from aqueous solutions.9 Several adsorbents, like activated alumina,10 zeolites,11 natural bisorbents such as chitosan,12 but also activated carbon13 have been used for the removal of Cr(VI) from aqueous solutions. Due to the high cost, commercial activated carbon is not available in less developed countries and there is a considerable attention to produce activated carbon from less expensive and available materials. As a low-cost adsorbent, activated carbon can be produced from materials such as rice husk, seeds husk, tea leaves, sawdust, oil palm shell, coconut husk and coconut shell.14 Activated carbon is one of the most important adsorbents which is applied in different areas. In these areas it is important to determine and remove low concentrations of some pollutants, such as heavy metals. Very good features of this adsorbent are the main reason why it is used, such as large surface area, porous structure, high adsorption capacity, selective adsorption and low cost. Also, it is important to note that activated carbon has microcrystalline structure with different size and shape of pores, while surface groups plays important role in the adsorption process. Carbon - oxygen surface groups are the most important and they influence the surface characteristics, such as polarity and physicochemical properties of adsorbent. There are two processes for preparation of activated carbon, chemical activation which involves presence of chemical agents, and physical activation, which involves carbonization.15-16 For this research, low-cost powdered activated carbon made from coconut shell was used as adsorbent to remove Cr(VI) from aqueous solutions. Characterization of activated carbon, produced from coconut shell, was accomplished using scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) method. The effects of three 57. savetovanje SHD 137 adsorption parameters, such as solution pH, contact time and initial Cr(VI) concentration, were investigated with respect to the removal efficiency of Cr(VI) from aqueous solutions. Adsorption equilibrium characteristics were analyzed by using the two adsorption models, namely the Langmuir and the Freundlich isotherms.
AB  - Praškast ugljenični materijal proizveden iz kokosove ljuske korišćen je kao adsorbent za uklanjanje Cr(VI) jona iz vodenih rastvora. Karakterizacija adsorbenta rađena je primenom dve analitičke tehnike, skenirajućom elektronskom mikroskopijom (SEM) i BET metodom. Eksperimenti adsorpcije rađeni su u šaržnom režimu, kako bi se istražili uticaji pH rastvora, vremena kontakta i početne koncentracije Cr(VI) jona. Eksperimentalni rezultati su pokazali da je efikasnost uklanjanja Cr(VI) najveća u pH intervalu od 2,0 do 3,5, a da se ravnoteža uspostavlja nakon 60 minuta. Dva ravnotežna adsorpciona modela, Langmirov i Frojndlihov, korišćena su za fitovanje dobijenih podataka. Frojndlihova izoterma je obezbedila najbolju korelaciju za adsorpciju Cr(VI) jona na ugljeničnom materijalu proizvedenom iz kokosove ljuske. Na osnovu dobijenih rezultata može se zaključiti da ugljenični materijal proizveden iz kokosove ljuske predstavlja jeftin i efikasan adsorbent koji bi potencijalno mogao biti korišćen za tretman otpadnih voda koje sadrže toksični Cr(VI).
PB  - Belgrade : Serbian Chemical Society
C3  - 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings
T1  - Chromium(VI) removal from aqueous solutions using powdered coconut shell activated carbon as a low-cost adsorbent
T1  - Uklanjanje hroma(VI) iz vode primenom praškastog ugljeničnog materijala dobijenog iz kokosove ljuske kao jeftinog adsorbenta
SP  - 136
EP  - 142
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12081
ER  - 

@conference{
author = "Stanković, Katarina and Vujasin, Radojka and Egerić, Marija and Matović, Ljiljana and Petrović, Đorđe Ž. and Kumrić, Ksenija",
year = "2021",
abstract = "Most heavy metals, such as Cr (chromium), Pb (lead), Cd (cadmium), Ni (nickel), Cu (copper) and Fe (iron), are extremely toxic above a tolerance limit. These heavy metals in wastewater are not biodegradable and can cause serious harm to human health and ecological environments.1 One of the top-priority toxic heavy metal in wastewater is chromium.2 In natural waters, chromium exists in both trivalent Cr(III) and hexavalent Cr(VI) forms. Cr(VI) is the most toxic one and have the tolerance limit 0.1 mg/L into surface water and 0.05 mg/L in potable water.3 Various methods, such as ion exchange, sedimentation, electrochemical process, cementation, coagulation, adsorption and solvent extraction have been developed for the removal of Cr(VI) and other toxic metals from wastewater.4 Among these methods, in some papers,5-8 adsorption has been used as one of the most effective method for the removal of Cr(VI) from aqueous solutions. Characteristics of adsorption, such as low cost, easy to perform, efficient and reversible method with high operating speed, make this method as most commonly used for the removal of Cr(VI) from aqueous solutions.9 Several adsorbents, like activated alumina,10 zeolites,11 natural bisorbents such as chitosan,12 but also activated carbon13 have been used for the removal of Cr(VI) from aqueous solutions. Due to the high cost, commercial activated carbon is not available in less developed countries and there is a considerable attention to produce activated carbon from less expensive and available materials. As a low-cost adsorbent, activated carbon can be produced from materials such as rice husk, seeds husk, tea leaves, sawdust, oil palm shell, coconut husk and coconut shell.14 Activated carbon is one of the most important adsorbents which is applied in different areas. In these areas it is important to determine and remove low concentrations of some pollutants, such as heavy metals. Very good features of this adsorbent are the main reason why it is used, such as large surface area, porous structure, high adsorption capacity, selective adsorption and low cost. Also, it is important to note that activated carbon has microcrystalline structure with different size and shape of pores, while surface groups plays important role in the adsorption process. Carbon - oxygen surface groups are the most important and they influence the surface characteristics, such as polarity and physicochemical properties of adsorbent. There are two processes for preparation of activated carbon, chemical activation which involves presence of chemical agents, and physical activation, which involves carbonization.15-16 For this research, low-cost powdered activated carbon made from coconut shell was used as adsorbent to remove Cr(VI) from aqueous solutions. Characterization of activated carbon, produced from coconut shell, was accomplished using scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) method. The effects of three 57. savetovanje SHD 137 adsorption parameters, such as solution pH, contact time and initial Cr(VI) concentration, were investigated with respect to the removal efficiency of Cr(VI) from aqueous solutions. Adsorption equilibrium characteristics were analyzed by using the two adsorption models, namely the Langmuir and the Freundlich isotherms., Praškast ugljenični materijal proizveden iz kokosove ljuske korišćen je kao adsorbent za uklanjanje Cr(VI) jona iz vodenih rastvora. Karakterizacija adsorbenta rađena je primenom dve analitičke tehnike, skenirajućom elektronskom mikroskopijom (SEM) i BET metodom. Eksperimenti adsorpcije rađeni su u šaržnom režimu, kako bi se istražili uticaji pH rastvora, vremena kontakta i početne koncentracije Cr(VI) jona. Eksperimentalni rezultati su pokazali da je efikasnost uklanjanja Cr(VI) najveća u pH intervalu od 2,0 do 3,5, a da se ravnoteža uspostavlja nakon 60 minuta. Dva ravnotežna adsorpciona modela, Langmirov i Frojndlihov, korišćena su za fitovanje dobijenih podataka. Frojndlihova izoterma je obezbedila najbolju korelaciju za adsorpciju Cr(VI) jona na ugljeničnom materijalu proizvedenom iz kokosove ljuske. Na osnovu dobijenih rezultata može se zaključiti da ugljenični materijal proizveden iz kokosove ljuske predstavlja jeftin i efikasan adsorbent koji bi potencijalno mogao biti korišćen za tretman otpadnih voda koje sadrže toksični Cr(VI).",
publisher = "Belgrade : Serbian Chemical Society",
journal = "57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings",
title = "Chromium(VI) removal from aqueous solutions using powdered coconut shell activated carbon as a low-cost adsorbent, Uklanjanje hroma(VI) iz vode primenom praškastog ugljeničnog materijala dobijenog iz kokosove ljuske kao jeftinog adsorbenta",
pages = "136-142",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12081"
}

Stanković, K., Vujasin, R., Egerić, M., Matović, L., Petrović, Đ. Ž.,& Kumrić, K.. (2021). Chromium(VI) removal from aqueous solutions using powdered coconut shell activated carbon as a low-cost adsorbent. in 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings
Belgrade : Serbian Chemical Society., 136-142.
https://hdl.handle.net/21.15107/rcub_vinar_12081

Stanković K, Vujasin R, Egerić M, Matović L, Petrović ĐŽ, Kumrić K. Chromium(VI) removal from aqueous solutions using powdered coconut shell activated carbon as a low-cost adsorbent. in 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings. 2021;:136-142.
https://hdl.handle.net/21.15107/rcub_vinar_12081 .

Stanković, Katarina, Vujasin, Radojka, Egerić, Marija, Matović, Ljiljana, Petrović, Đorđe Ž., Kumrić, Ksenija, "Chromium(VI) removal from aqueous solutions using powdered coconut shell activated carbon as a low-cost adsorbent" in 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings (2021):136-142,
https://hdl.handle.net/21.15107/rcub_vinar_12081 .

TY  - CONF
AU  - Vujasin, Radojka
AU  - Stanković, Srboljub
AU  - Kumrić, Ksenija
AU  - Devečerski, Aleksandar
AU  - Wu, Yi-nan
AU  - Petrović, Đorđe Ž.
AU  - Matović, Ljiljana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12086
PB  - Leskovac : Faculty of Technology
C3  - 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts
T1  - Stabilization of heavy metals in electroplating sludge using chelating agent
SP  - 111
EP  - 111
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12086
ER  - 

@conference{
author = "Vujasin, Radojka and Stanković, Srboljub and Kumrić, Ksenija and Devečerski, Aleksandar and Wu, Yi-nan and Petrović, Đorđe Ž. and Matović, Ljiljana",
year = "2021",
publisher = "Leskovac : Faculty of Technology",
journal = "14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts",
title = "Stabilization of heavy metals in electroplating sludge using chelating agent",
pages = "111-111",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12086"
}

Vujasin, R., Stanković, S., Kumrić, K., Devečerski, A., Wu, Y., Petrović, Đ. Ž.,& Matović, L.. (2021). Stabilization of heavy metals in electroplating sludge using chelating agent. in 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts
Leskovac : Faculty of Technology., 111-111.
https://hdl.handle.net/21.15107/rcub_vinar_12086

Vujasin R, Stanković S, Kumrić K, Devečerski A, Wu Y, Petrović ĐŽ, Matović L. Stabilization of heavy metals in electroplating sludge using chelating agent. in 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts. 2021;:111-111.
https://hdl.handle.net/21.15107/rcub_vinar_12086 .

Vujasin, Radojka, Stanković, Srboljub, Kumrić, Ksenija, Devečerski, Aleksandar, Wu, Yi-nan, Petrović, Đorđe Ž., Matović, Ljiljana, "Stabilization of heavy metals in electroplating sludge using chelating agent" in 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts (2021):111-111,
https://hdl.handle.net/21.15107/rcub_vinar_12086 .

TY  - CONF
AU  - Stanković, Katarina
AU  - Kumrić, Ksenija
AU  - Wu, Yi-nan
AU  - Petrović, Đorđe Ž.
AU  - Egerić, Marija
AU  - Vujasin, Radojka
AU  - Matović, Ljiljana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12087
PB  - Leskovac : Faculty of Technology
C3  - 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts
T1  - Zirconium-based metal-organic framework UiO-66 as adsorbent for efficient removal of Cr(VI) from aqueous solutions
SP  - 112
EP  - 112
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12087
ER  - 

@conference{
author = "Stanković, Katarina and Kumrić, Ksenija and Wu, Yi-nan and Petrović, Đorđe Ž. and Egerić, Marija and Vujasin, Radojka and Matović, Ljiljana",
year = "2021",
publisher = "Leskovac : Faculty of Technology",
journal = "14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts",
title = "Zirconium-based metal-organic framework UiO-66 as adsorbent for efficient removal of Cr(VI) from aqueous solutions",
pages = "112-112",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12087"
}

Stanković, K., Kumrić, K., Wu, Y., Petrović, Đ. Ž., Egerić, M., Vujasin, R.,& Matović, L.. (2021). Zirconium-based metal-organic framework UiO-66 as adsorbent for efficient removal of Cr(VI) from aqueous solutions. in 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts
Leskovac : Faculty of Technology., 112-112.
https://hdl.handle.net/21.15107/rcub_vinar_12087

Stanković K, Kumrić K, Wu Y, Petrović ĐŽ, Egerić M, Vujasin R, Matović L. Zirconium-based metal-organic framework UiO-66 as adsorbent for efficient removal of Cr(VI) from aqueous solutions. in 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts. 2021;:112-112.
https://hdl.handle.net/21.15107/rcub_vinar_12087 .

Stanković, Katarina, Kumrić, Ksenija, Wu, Yi-nan, Petrović, Đorđe Ž., Egerić, Marija, Vujasin, Radojka, Matović, Ljiljana, "Zirconium-based metal-organic framework UiO-66 as adsorbent for efficient removal of Cr(VI) from aqueous solutions" in 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts (2021):112-112,
https://hdl.handle.net/21.15107/rcub_vinar_12087 .

TY  - CONF
AU  - Stanković, Katarina
AU  - Petrović, Đorđe Ž.
AU  - Telečki, Igor
AU  - Vujasin, Radojka
AU  - Matović, Ljiljana
AU  - Devečerski, Aleksandar
AU  - Kumrić, Ksenija
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12090
PB  - Leskovac : Faculty of Technology
C3  - 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts
T1  - Adsorptive removal of heavy metals by citric acid functionalized chitosan hydrogel beads: batch and continuous fixed-bed column study
SP  - 113
EP  - 113
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12090
ER  - 

@conference{
author = "Stanković, Katarina and Petrović, Đorđe Ž. and Telečki, Igor and Vujasin, Radojka and Matović, Ljiljana and Devečerski, Aleksandar and Kumrić, Ksenija",
year = "2021",
publisher = "Leskovac : Faculty of Technology",
journal = "14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts",
title = "Adsorptive removal of heavy metals by citric acid functionalized chitosan hydrogel beads: batch and continuous fixed-bed column study",
pages = "113-113",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12090"
}

Stanković, K., Petrović, Đ. Ž., Telečki, I., Vujasin, R., Matović, L., Devečerski, A.,& Kumrić, K.. (2021). Adsorptive removal of heavy metals by citric acid functionalized chitosan hydrogel beads: batch and continuous fixed-bed column study. in 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts
Leskovac : Faculty of Technology., 113-113.
https://hdl.handle.net/21.15107/rcub_vinar_12090

Stanković K, Petrović ĐŽ, Telečki I, Vujasin R, Matović L, Devečerski A, Kumrić K. Adsorptive removal of heavy metals by citric acid functionalized chitosan hydrogel beads: batch and continuous fixed-bed column study. in 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts. 2021;:113-113.
https://hdl.handle.net/21.15107/rcub_vinar_12090 .

Stanković, Katarina, Petrović, Đorđe Ž., Telečki, Igor, Vujasin, Radojka, Matović, Ljiljana, Devečerski, Aleksandar, Kumrić, Ksenija, "Adsorptive removal of heavy metals by citric acid functionalized chitosan hydrogel beads: batch and continuous fixed-bed column study" in 14th Symposium with International Participation "Novel Technologies and Economic Development" : Book of abstracts (2021):113-113,
https://hdl.handle.net/21.15107/rcub_vinar_12090 .

TY  - JOUR
AU  - Kumrić, Ksenija
AU  - Vujasin, Radojka
AU  - Egerić, Marija
AU  - Petrović, Đorđe
AU  - Devečerski, Aleksandar
AU  - Matović, Ljiljana
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8678
AB  - Solid-phase extraction (SPE) on activated carbon derived from coconut shell (CSAC) for the preconcentration of four varying polarity pesticides (imidacloprid, acetamiprid, simazine, and linuron) prior to their determination using high performance liquid chromatography with diode array detector (HPLC-DAD) was investigated. The characteristics of the CSAC were analyzed through X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) method. The effects of the solution pH, eluent type, eluent volume, and flow rate were investigated for optimization of the presented procedure. The adsorption was achieved quantitatively on the CSAC column in the pH range of 2.0–7.0, and then the retained pesticides were eluted with dichloromethane. The detection limit was found to be 0.025–0.039 μg L−1, depending on the pesticide. The proposed SPE-CSAC method was used to determine selected pesticides in tap water samples. The recoveries ranged from 58.2 to 105.3%, with low relative standard deviations. The obtained results indicated that the CSAC could be efficiently used as a low cost alternative to commercially available SPE adsorbents for the determination of the varying polarity pesticides in environmental water samples at trace levels. © 2019, Springer Nature Switzerland AG.
T2  - Water, Air, and Soil Pollution
T1  - Coconut Shell Activated Carbon as Solid-Phase Extraction Adsorbent for Preconcentration of Selected Pesticides from Water Samples
VL  - 230
IS  - 12
SP  - 302
DO  - 10.1007/s11270-019-4359-7
ER  - 

@article{
author = "Kumrić, Ksenija and Vujasin, Radojka and Egerić, Marija and Petrović, Đorđe and Devečerski, Aleksandar and Matović, Ljiljana",
year = "2019",
abstract = "Solid-phase extraction (SPE) on activated carbon derived from coconut shell (CSAC) for the preconcentration of four varying polarity pesticides (imidacloprid, acetamiprid, simazine, and linuron) prior to their determination using high performance liquid chromatography with diode array detector (HPLC-DAD) was investigated. The characteristics of the CSAC were analyzed through X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) method. The effects of the solution pH, eluent type, eluent volume, and flow rate were investigated for optimization of the presented procedure. The adsorption was achieved quantitatively on the CSAC column in the pH range of 2.0–7.0, and then the retained pesticides were eluted with dichloromethane. The detection limit was found to be 0.025–0.039 μg L−1, depending on the pesticide. The proposed SPE-CSAC method was used to determine selected pesticides in tap water samples. The recoveries ranged from 58.2 to 105.3%, with low relative standard deviations. The obtained results indicated that the CSAC could be efficiently used as a low cost alternative to commercially available SPE adsorbents for the determination of the varying polarity pesticides in environmental water samples at trace levels. © 2019, Springer Nature Switzerland AG.",
journal = "Water, Air, and Soil Pollution",
title = "Coconut Shell Activated Carbon as Solid-Phase Extraction Adsorbent for Preconcentration of Selected Pesticides from Water Samples",
volume = "230",
number = "12",
pages = "302",
doi = "10.1007/s11270-019-4359-7"
}

Kumrić, K., Vujasin, R., Egerić, M., Petrović, Đ., Devečerski, A.,& Matović, L.. (2019). Coconut Shell Activated Carbon as Solid-Phase Extraction Adsorbent for Preconcentration of Selected Pesticides from Water Samples. in Water, Air, and Soil Pollution, 230(12), 302.
https://doi.org/10.1007/s11270-019-4359-7

Kumrić K, Vujasin R, Egerić M, Petrović Đ, Devečerski A, Matović L. Coconut Shell Activated Carbon as Solid-Phase Extraction Adsorbent for Preconcentration of Selected Pesticides from Water Samples. in Water, Air, and Soil Pollution. 2019;230(12):302.
doi:10.1007/s11270-019-4359-7 .

Kumrić, Ksenija, Vujasin, Radojka, Egerić, Marija, Petrović, Đorđe, Devečerski, Aleksandar, Matović, Ljiljana, "Coconut Shell Activated Carbon as Solid-Phase Extraction Adsorbent for Preconcentration of Selected Pesticides from Water Samples" in Water, Air, and Soil Pollution, 230, no. 12 (2019):302,
https://doi.org/10.1007/s11270-019-4359-7 . .

TY  - JOUR
AU  - Zdolšek, Nikola
AU  - Kumrić, Ksenija
AU  - Kalijadis, Ana
AU  - Trtić-Petrović, Tatjana M.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1527
AB  - A sensitive method for the determination of six varying polarity pesticides (imidacloprid, acetamiprid, carbendazim, simazine, linuron, and tebufenozide) based on a solid-phase extraction disk with multiwalled nanotubes is proposed. A dispersion of multiwalled nanotubes in a surfactant aqueous solution (Triton X-100) was used for the preparation of the solid-phase extraction disk. The effect of surfactant on the functional groups of multiwalled nanotubes was examined by applying temperature-programmed desorption. It was found that this treatment increased the amount of oxygen groups of treated multiwalled nanotubes comparing with untreated ones. The factors that may influence the adsorption and recovery such as the kind and volume of eluent, volume, flow rate and pH of sample were investigated and optimized. Under the optimized conditions, the maximal enrichment factors for low polar pesticides are ranging from 4000 to 4985 and for more polar are 2250 and 2750. The linear range of calibration curves was 10-500 ng/L with correlation coefficient higher than 0.9960, and the detection limit was 6.2-23.7 ng/L. Finally optimized method was applied for determination trace level of five out of six pesticides in tap and river water samples with good recovery.
T2  - Journal of Separation Science
T1  - Solid-phase extraction disk based on multiwalled carbon nanotubes for the enrichment of targeted pesticides from aqueous samples
VL  - 40
IS  - 7
SP  - 1564
EP  - 1571
DO  - 10.1002/jssc.201600957
ER  - 

@article{
author = "Zdolšek, Nikola and Kumrić, Ksenija and Kalijadis, Ana and Trtić-Petrović, Tatjana M.",
year = "2017",
abstract = "A sensitive method for the determination of six varying polarity pesticides (imidacloprid, acetamiprid, carbendazim, simazine, linuron, and tebufenozide) based on a solid-phase extraction disk with multiwalled nanotubes is proposed. A dispersion of multiwalled nanotubes in a surfactant aqueous solution (Triton X-100) was used for the preparation of the solid-phase extraction disk. The effect of surfactant on the functional groups of multiwalled nanotubes was examined by applying temperature-programmed desorption. It was found that this treatment increased the amount of oxygen groups of treated multiwalled nanotubes comparing with untreated ones. The factors that may influence the adsorption and recovery such as the kind and volume of eluent, volume, flow rate and pH of sample were investigated and optimized. Under the optimized conditions, the maximal enrichment factors for low polar pesticides are ranging from 4000 to 4985 and for more polar are 2250 and 2750. The linear range of calibration curves was 10-500 ng/L with correlation coefficient higher than 0.9960, and the detection limit was 6.2-23.7 ng/L. Finally optimized method was applied for determination trace level of five out of six pesticides in tap and river water samples with good recovery.",
journal = "Journal of Separation Science",
title = "Solid-phase extraction disk based on multiwalled carbon nanotubes for the enrichment of targeted pesticides from aqueous samples",
volume = "40",
number = "7",
pages = "1564-1571",
doi = "10.1002/jssc.201600957"
}

Zdolšek, N., Kumrić, K., Kalijadis, A.,& Trtić-Petrović, T. M.. (2017). Solid-phase extraction disk based on multiwalled carbon nanotubes for the enrichment of targeted pesticides from aqueous samples. in Journal of Separation Science, 40(7), 1564-1571.
https://doi.org/10.1002/jssc.201600957

Zdolšek N, Kumrić K, Kalijadis A, Trtić-Petrović TM. Solid-phase extraction disk based on multiwalled carbon nanotubes for the enrichment of targeted pesticides from aqueous samples. in Journal of Separation Science. 2017;40(7):1564-1571.
doi:10.1002/jssc.201600957 .

Zdolšek, Nikola, Kumrić, Ksenija, Kalijadis, Ana, Trtić-Petrović, Tatjana M., "Solid-phase extraction disk based on multiwalled carbon nanotubes for the enrichment of targeted pesticides from aqueous samples" in Journal of Separation Science, 40, no. 7 (2017):1564-1571,
https://doi.org/10.1002/jssc.201600957 . .

TY  - JOUR
AU  - Matović, Ljiljana
AU  - Đukić, Anđelka B.
AU  - Omeraevic, M.
AU  - Kumrić, Ksenija
AU  - Rosskopfova, O.
AU  - Hamarova, A.
AU  - Rajec, Pavol
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1802
AB  - Low-cost adsorbents, synthesized by pyrolysis of waste rubber (CR) and activated with KOH (CRA), have shown the high removal ability of from aqueous solutions in wide range of pHs (2-10) with fast adsorption rate. The Langmuir and Freundlich models suggests monolayer and multilayer adsorption of onto CR and CRA surface, respectively. The removal mechanism of from solution occurs by replacement with OH- from surface groups (phenolic and/or accompanying carboxylic) of CR and CRA indicating anion exchange mechanism.
T2  - Journal of Radioanalytical and Nuclear Chemistry
T1  - Removal of pertechnetate from aqueous solution using activated pyrolytic rubber char
VL  - 314
IS  - 2
SP  - 897
EP  - 905
DO  - 10.1007/s10967-017-5442-4
ER  - 

@article{
author = "Matović, Ljiljana and Đukić, Anđelka B. and Omeraevic, M. and Kumrić, Ksenija and Rosskopfova, O. and Hamarova, A. and Rajec, Pavol",
year = "2017",
abstract = "Low-cost adsorbents, synthesized by pyrolysis of waste rubber (CR) and activated with KOH (CRA), have shown the high removal ability of from aqueous solutions in wide range of pHs (2-10) with fast adsorption rate. The Langmuir and Freundlich models suggests monolayer and multilayer adsorption of onto CR and CRA surface, respectively. The removal mechanism of from solution occurs by replacement with OH- from surface groups (phenolic and/or accompanying carboxylic) of CR and CRA indicating anion exchange mechanism.",
journal = "Journal of Radioanalytical and Nuclear Chemistry",
title = "Removal of pertechnetate from aqueous solution using activated pyrolytic rubber char",
volume = "314",
number = "2",
pages = "897-905",
doi = "10.1007/s10967-017-5442-4"
}

Matović, L., Đukić, A. B., Omeraevic, M., Kumrić, K., Rosskopfova, O., Hamarova, A.,& Rajec, P.. (2017). Removal of pertechnetate from aqueous solution using activated pyrolytic rubber char. in Journal of Radioanalytical and Nuclear Chemistry, 314(2), 897-905.
https://doi.org/10.1007/s10967-017-5442-4

Matović L, Đukić AB, Omeraevic M, Kumrić K, Rosskopfova O, Hamarova A, Rajec P. Removal of pertechnetate from aqueous solution using activated pyrolytic rubber char. in Journal of Radioanalytical and Nuclear Chemistry. 2017;314(2):897-905.
doi:10.1007/s10967-017-5442-4 .

Matović, Ljiljana, Đukić, Anđelka B., Omeraevic, M., Kumrić, Ksenija, Rosskopfova, O., Hamarova, A., Rajec, Pavol, "Removal of pertechnetate from aqueous solution using activated pyrolytic rubber char" in Journal of Radioanalytical and Nuclear Chemistry, 314, no. 2 (2017):897-905,
https://doi.org/10.1007/s10967-017-5442-4 . .

TY  - JOUR
AU  - Milicević, Sonja
AU  - Matović, Ljiljana
AU  - Petrović, Đorđe
AU  - Aukic, Andelka
AU  - Milošević, Vladan
AU  - Dokic, Divna
AU  - Kumrić, Ksenija
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1270
AB  - Natural clinoptilolite modified with a cationic surfactant stearyldimethylbenzylammonium chloride (SDBAC) was used as an adsorbent for the removal of pertechnetate from aqueous solutions. Adsorption studies were performed in a batch system. The effects of various experimental parameters (amount of surfactant loading, contact time, solution pH, competing anions) on the removal efficiency of TcO4 (-) were investigated. SDBAC-clinoptilolite with organo-bilayer was successfully used to remove TcO4 (-) from aqueous solutions in the pH range of 5.0-8.0. ReO4 (-) as an analogue of TcO4 (-) was used to model the isotherms. Adsorption capacity of the SDBAC-clinoptilolite and the mechanism of ReO4 (-) (TcO4 (-)) sorption were also determined.
T2  - Journal of Radioanalytical and Nuclear Chemistry
T1  - Surfactant modification and adsorption properties of clinoptilolite for the removal of pertechnetate from aqueous solutions
VL  - 310
IS  - 2
SP  - 805
EP  - 815
DO  - 10.1007/s10967-016-4850-1
ER  - 

@article{
author = "Milicević, Sonja and Matović, Ljiljana and Petrović, Đorđe and Aukic, Andelka and Milošević, Vladan and Dokic, Divna and Kumrić, Ksenija",
year = "2016",
abstract = "Natural clinoptilolite modified with a cationic surfactant stearyldimethylbenzylammonium chloride (SDBAC) was used as an adsorbent for the removal of pertechnetate from aqueous solutions. Adsorption studies were performed in a batch system. The effects of various experimental parameters (amount of surfactant loading, contact time, solution pH, competing anions) on the removal efficiency of TcO4 (-) were investigated. SDBAC-clinoptilolite with organo-bilayer was successfully used to remove TcO4 (-) from aqueous solutions in the pH range of 5.0-8.0. ReO4 (-) as an analogue of TcO4 (-) was used to model the isotherms. Adsorption capacity of the SDBAC-clinoptilolite and the mechanism of ReO4 (-) (TcO4 (-)) sorption were also determined.",
journal = "Journal of Radioanalytical and Nuclear Chemistry",
title = "Surfactant modification and adsorption properties of clinoptilolite for the removal of pertechnetate from aqueous solutions",
volume = "310",
number = "2",
pages = "805-815",
doi = "10.1007/s10967-016-4850-1"
}

Milicević, S., Matović, L., Petrović, Đ., Aukic, A., Milošević, V., Dokic, D.,& Kumrić, K.. (2016). Surfactant modification and adsorption properties of clinoptilolite for the removal of pertechnetate from aqueous solutions. in Journal of Radioanalytical and Nuclear Chemistry, 310(2), 805-815.
https://doi.org/10.1007/s10967-016-4850-1

Milicević S, Matović L, Petrović Đ, Aukic A, Milošević V, Dokic D, Kumrić K. Surfactant modification and adsorption properties of clinoptilolite for the removal of pertechnetate from aqueous solutions. in Journal of Radioanalytical and Nuclear Chemistry. 2016;310(2):805-815.
doi:10.1007/s10967-016-4850-1 .

Milicević, Sonja, Matović, Ljiljana, Petrović, Đorđe, Aukic, Andelka, Milošević, Vladan, Dokic, Divna, Kumrić, Ksenija, "Surfactant modification and adsorption properties of clinoptilolite for the removal of pertechnetate from aqueous solutions" in Journal of Radioanalytical and Nuclear Chemistry, 310, no. 2 (2016):805-815,
https://doi.org/10.1007/s10967-016-4850-1 . .

TY  - JOUR
AU  - Đukić, Anđelka B.
AU  - Kumrić, Ksenija
AU  - Vukelić, Nikola S.
AU  - Stojanović, Zoran S.
AU  - Stojmenović, Marija
AU  - Milošević, Sanja S.
AU  - Matović, Ljiljana
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/419
AB  - The aim of the present study was to investigate the effect of ageing of mechanochemically synthesized clay and its TiO2 composite on the simultaneous removal of Pb(II), Cd(II), Cu(II) and Zn(II) ions from acidic aqueous solutions. The effect of different ageing times on sorption behavior of 1, 2, 10 and 19 h milled clays, as well as the clay composite with 20 wt% of amorphous TiO2 (TiO2,a), was investigated. Ageing of the milled clays has stronger influence on the removal of Zn(II) and Cd(II) than on the removal of Pb(II) and Cu(1) ions. Ageing is particularly pronounced for the samples milled for 1, 2 and 10 h (which lost enhanced sorption properties after 3 months of ageing), and less pronounced for the samples milled longer period of time, 19 h (which retained sorption properties until 6 months). After these periods of time sorption capacities became nearly the same as the sorption capacities of the raw (unmilled) clay. The different responses on the ageing process of milled clays and composite are a consequence of microstructural changes such as recrystallization of montmorillonite phase and decrease in particle sizes. Slower ageing of composite compare to the milled clays can be related to the stabilization effect of TiO2 particles which are dispersed in the clay matrix thus preventing recrystallization of the sample particles. Only a slight tendency towards the formation of agglomerations was noticed after 12 months of ageing. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Influence of ageing of milled clay and its composite with TiO2 on the heavy metal adsorption characteristics
VL  - 41
IS  - 3
SP  - 5129
EP  - 5137
DO  - 10.1016/j.ceramint.2014.12.085
ER  - 

@article{
author = "Đukić, Anđelka B. and Kumrić, Ksenija and Vukelić, Nikola S. and Stojanović, Zoran S. and Stojmenović, Marija and Milošević, Sanja S. and Matović, Ljiljana",
year = "2015",
abstract = "The aim of the present study was to investigate the effect of ageing of mechanochemically synthesized clay and its TiO2 composite on the simultaneous removal of Pb(II), Cd(II), Cu(II) and Zn(II) ions from acidic aqueous solutions. The effect of different ageing times on sorption behavior of 1, 2, 10 and 19 h milled clays, as well as the clay composite with 20 wt% of amorphous TiO2 (TiO2,a), was investigated. Ageing of the milled clays has stronger influence on the removal of Zn(II) and Cd(II) than on the removal of Pb(II) and Cu(1) ions. Ageing is particularly pronounced for the samples milled for 1, 2 and 10 h (which lost enhanced sorption properties after 3 months of ageing), and less pronounced for the samples milled longer period of time, 19 h (which retained sorption properties until 6 months). After these periods of time sorption capacities became nearly the same as the sorption capacities of the raw (unmilled) clay. The different responses on the ageing process of milled clays and composite are a consequence of microstructural changes such as recrystallization of montmorillonite phase and decrease in particle sizes. Slower ageing of composite compare to the milled clays can be related to the stabilization effect of TiO2 particles which are dispersed in the clay matrix thus preventing recrystallization of the sample particles. Only a slight tendency towards the formation of agglomerations was noticed after 12 months of ageing. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Influence of ageing of milled clay and its composite with TiO2 on the heavy metal adsorption characteristics",
volume = "41",
number = "3",
pages = "5129-5137",
doi = "10.1016/j.ceramint.2014.12.085"
}

Đukić, A. B., Kumrić, K., Vukelić, N. S., Stojanović, Z. S., Stojmenović, M., Milošević, S. S.,& Matović, L.. (2015). Influence of ageing of milled clay and its composite with TiO2 on the heavy metal adsorption characteristics. in Ceramics International, 41(3), 5129-5137.
https://doi.org/10.1016/j.ceramint.2014.12.085

Đukić AB, Kumrić K, Vukelić NS, Stojanović ZS, Stojmenović M, Milošević SS, Matović L. Influence of ageing of milled clay and its composite with TiO2 on the heavy metal adsorption characteristics. in Ceramics International. 2015;41(3):5129-5137.
doi:10.1016/j.ceramint.2014.12.085 .

Đukić, Anđelka B., Kumrić, Ksenija, Vukelić, Nikola S., Stojanović, Zoran S., Stojmenović, Marija, Milošević, Sanja S., Matović, Ljiljana, "Influence of ageing of milled clay and its composite with TiO2 on the heavy metal adsorption characteristics" in Ceramics International, 41, no. 3 (2015):5129-5137,
https://doi.org/10.1016/j.ceramint.2014.12.085 . .

TY  - JOUR
AU  - Petrović, Đorđe
AU  - Trtić-Petrović, Tatjana M.
AU  - Vladisavljević, Goran T.
AU  - Stoiljković, Milovan
AU  - Slavković-Beškoski, Latinka J.
AU  - Kumrić, Ksenija
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/562
AB  - Separation of yttrium(III) from strontium(II) with 15% (v/v) di(2-ethylhexyl)phosphoric acid (DEHPA) in dodecane was carried out in a hollow fiber supported liquid membrane (SLM) extraction system operated under closed-loop recirculation of the donor and acceptor phase. The donor phase was a mixture of 5.7 mmol dm(-3) of Sr(II) and 0.23 mmol dm(-3) of Y(III) in 0.1 mol dm(-3) HCl, the acceptor solution was 3 mol dm(-3) HCl, and the donor to acceptor phase volume ratio was 6.2. At the donor flow rate of 4.7 cm(3) min(-1) and the acceptor flow rate of 0.8 cm(3) min(-1), the yield of Y(III) in the acceptor phase (in the form suitable for radiopharmaceutical preparation) reached 60% after 360 min with a molar ratio of Y(III) to Sr(II) in the acceptor of 250:1, as compared to 1:25 in the donor phase. The yield of Y(III) was 72% at the acceptor flow rate to 1.9 cm3 min(-1), but a breakthrough of Sr(II) through liquid membrane increased from 0.02 to 0.2%. (C) 2015 The Institution a Chemical Engineers. Published by Elsevier B.V. All rights reserved.
T2  - Chemical Engineering Research and Design
T1  - Novel Sr-90-Y-90 generator system based on a pertraction through supported liquid membrane in hollow fiber contactor
VL  - 97
SP  - 57
EP  - 67
DO  - 10.1016/j.cherd.2015.03.015
ER  - 

@article{
author = "Petrović, Đorđe and Trtić-Petrović, Tatjana M. and Vladisavljević, Goran T. and Stoiljković, Milovan and Slavković-Beškoski, Latinka J. and Kumrić, Ksenija",
year = "2015",
abstract = "Separation of yttrium(III) from strontium(II) with 15% (v/v) di(2-ethylhexyl)phosphoric acid (DEHPA) in dodecane was carried out in a hollow fiber supported liquid membrane (SLM) extraction system operated under closed-loop recirculation of the donor and acceptor phase. The donor phase was a mixture of 5.7 mmol dm(-3) of Sr(II) and 0.23 mmol dm(-3) of Y(III) in 0.1 mol dm(-3) HCl, the acceptor solution was 3 mol dm(-3) HCl, and the donor to acceptor phase volume ratio was 6.2. At the donor flow rate of 4.7 cm(3) min(-1) and the acceptor flow rate of 0.8 cm(3) min(-1), the yield of Y(III) in the acceptor phase (in the form suitable for radiopharmaceutical preparation) reached 60% after 360 min with a molar ratio of Y(III) to Sr(II) in the acceptor of 250:1, as compared to 1:25 in the donor phase. The yield of Y(III) was 72% at the acceptor flow rate to 1.9 cm3 min(-1), but a breakthrough of Sr(II) through liquid membrane increased from 0.02 to 0.2%. (C) 2015 The Institution a Chemical Engineers. Published by Elsevier B.V. All rights reserved.",
journal = "Chemical Engineering Research and Design",
title = "Novel Sr-90-Y-90 generator system based on a pertraction through supported liquid membrane in hollow fiber contactor",
volume = "97",
pages = "57-67",
doi = "10.1016/j.cherd.2015.03.015"
}

Petrović, Đ., Trtić-Petrović, T. M., Vladisavljević, G. T., Stoiljković, M., Slavković-Beškoski, L. J.,& Kumrić, K.. (2015). Novel Sr-90-Y-90 generator system based on a pertraction through supported liquid membrane in hollow fiber contactor. in Chemical Engineering Research and Design, 97, 57-67.
https://doi.org/10.1016/j.cherd.2015.03.015

Petrović Đ, Trtić-Petrović TM, Vladisavljević GT, Stoiljković M, Slavković-Beškoski LJ, Kumrić K. Novel Sr-90-Y-90 generator system based on a pertraction through supported liquid membrane in hollow fiber contactor. in Chemical Engineering Research and Design. 2015;97:57-67.
doi:10.1016/j.cherd.2015.03.015 .

Petrović, Đorđe, Trtić-Petrović, Tatjana M., Vladisavljević, Goran T., Stoiljković, Milovan, Slavković-Beškoski, Latinka J., Kumrić, Ksenija, "Novel Sr-90-Y-90 generator system based on a pertraction through supported liquid membrane in hollow fiber contactor" in Chemical Engineering Research and Design, 97 (2015):57-67,
https://doi.org/10.1016/j.cherd.2015.03.015 . .

TY  - JOUR
AU  - Đukić, Anđelka B.
AU  - Kumrić, Ksenija
AU  - Vukelić, Nikola S.
AU  - Dimitrijevic, Milena S.
AU  - Baščarević, Zvezdana D.
AU  - Kurko, Sandra V.
AU  - Matović, Ljiljana
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/345
AB  - The aim of the present study was to synthesize a composite of raw interstratified montmorillonite-kaolinite clay (Mt-K) with TiO2 as an additive by mechanochemical activation and investigate its usability as low-cost adsorbent for simultaneous removal of heavy metals from acidic aqueous solutions. The composite synthesized with amorphous TiO2 (TiO(2,)a) showed a significantly better removal ability of heavy metals from highly acidic solutions (pH = 2.0-4.0) compared with the Mt-K milled for an optimum period of time of 19 h (Mt-K,m) and composite synthesized with crystalline TiO2 (TiO(2,)c). As both of the composites showed the same morphologies, the same distribution of TiO2 particles on the clay matrix, the same particle size distribution (PSD) dependencies and point of zero charge (pH(PZC)) values, it has to be noticed that the difference in the adsorption behavior lies only in the different crystalline forms of the additive, i.e. TiO2 that was used for the composite preparation. It has been shown that 20% of TiO(2,)a was the optimal amount of an additive in the composite to achieve improved adsorption ability. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Applied Clay Science
T1  - Simultaneous removal of Pb2+, Cu2+, Zn2+ and Cd2+ from highly acidic solutions using mechanochemically synthesized montmorillonite-kaolinite/TiO2 composite
VL  - 103
SP  - 20
EP  - 27
DO  - 10.1016/j.clay.2014.10.021
ER  - 

@article{
author = "Đukić, Anđelka B. and Kumrić, Ksenija and Vukelić, Nikola S. and Dimitrijevic, Milena S. and Baščarević, Zvezdana D. and Kurko, Sandra V. and Matović, Ljiljana",
year = "2015",
abstract = "The aim of the present study was to synthesize a composite of raw interstratified montmorillonite-kaolinite clay (Mt-K) with TiO2 as an additive by mechanochemical activation and investigate its usability as low-cost adsorbent for simultaneous removal of heavy metals from acidic aqueous solutions. The composite synthesized with amorphous TiO2 (TiO(2,)a) showed a significantly better removal ability of heavy metals from highly acidic solutions (pH = 2.0-4.0) compared with the Mt-K milled for an optimum period of time of 19 h (Mt-K,m) and composite synthesized with crystalline TiO2 (TiO(2,)c). As both of the composites showed the same morphologies, the same distribution of TiO2 particles on the clay matrix, the same particle size distribution (PSD) dependencies and point of zero charge (pH(PZC)) values, it has to be noticed that the difference in the adsorption behavior lies only in the different crystalline forms of the additive, i.e. TiO2 that was used for the composite preparation. It has been shown that 20% of TiO(2,)a was the optimal amount of an additive in the composite to achieve improved adsorption ability. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Applied Clay Science",
title = "Simultaneous removal of Pb2+, Cu2+, Zn2+ and Cd2+ from highly acidic solutions using mechanochemically synthesized montmorillonite-kaolinite/TiO2 composite",
volume = "103",
pages = "20-27",
doi = "10.1016/j.clay.2014.10.021"
}

Đukić, A. B., Kumrić, K., Vukelić, N. S., Dimitrijevic, M. S., Baščarević, Z. D., Kurko, S. V.,& Matović, L.. (2015). Simultaneous removal of Pb2+, Cu2+, Zn2+ and Cd2+ from highly acidic solutions using mechanochemically synthesized montmorillonite-kaolinite/TiO2 composite. in Applied Clay Science, 103, 20-27.
https://doi.org/10.1016/j.clay.2014.10.021

Đukić AB, Kumrić K, Vukelić NS, Dimitrijevic MS, Baščarević ZD, Kurko SV, Matović L. Simultaneous removal of Pb2+, Cu2+, Zn2+ and Cd2+ from highly acidic solutions using mechanochemically synthesized montmorillonite-kaolinite/TiO2 composite. in Applied Clay Science. 2015;103:20-27.
doi:10.1016/j.clay.2014.10.021 .

Đukić, Anđelka B., Kumrić, Ksenija, Vukelić, Nikola S., Dimitrijevic, Milena S., Baščarević, Zvezdana D., Kurko, Sandra V., Matović, Ljiljana, "Simultaneous removal of Pb2+, Cu2+, Zn2+ and Cd2+ from highly acidic solutions using mechanochemically synthesized montmorillonite-kaolinite/TiO2 composite" in Applied Clay Science, 103 (2015):20-27,
https://doi.org/10.1016/j.clay.2014.10.021 . .