TY  - CONF
AU  - Živković, Ljiljana
AU  - Savić, Andrija
AU  - Castvan-Janković, Ivona
AU  - Lazarević, Slavica
AU  - Rogan, Jelena
AU  - Babić, Biljana
AU  - Petrović, Rada
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10664
AB  - Carbon cryogel (CC) was impregnated with magnetite to produce a multifunctional magnetic adsorbent capable of removing phenoles and phosphates from water. Adsorbents were prepared via co-precipitation of Fe2+ and Fe3+ ions in aqueous solution in the presence of CC. Non-treated or acid-activated CC was used. The CC: Fe3O4 ratios of 1:1 and 3:1 were applied. The addition of HCl in the synthesis process was also investigated. XRD confirmed the formation of nanocrystalline magnetite. BET analysis showed that the pre-treatment diminished the CC porous structure, reducing also specific surface area (Sp). Formation of magnetite decreases Sp and total volume of micro and meso pores, but their distribution remained unchanged. FTIR spectra revealed that magnetite was attached to the surface of the acid activated CC via C═O bond. DTA-TGA and SEM indicated that acid treatment and presence of HCl were beneficial for homogeneous nucleation and distribution of magnetite, increasing adsorption properties of composite. Batch adsorption proved that the maximum adsorption capacity for phenoles was accomplished with 3:1 ratio with non-treated CC. Samples synthesized with pre- treated CC, under 1:1 ratio, gave the best results for phosphate removal. The CC/magnetite composite was found as promising adsorbent for the simultaneous removal of both polutants.
PB  - Banja Luka : University PIM
C3  - XI International conference on social and technological development - STED 2022 : book of abstracts, Trebinje, June 2-5, 2022
T1  - Carbon Cryogel Magnetite Composites-Effective Adsorbents for the Phosphate and Phenol Removal from Water
SP  - 92
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10664
ER  - 

@conference{
author = "Živković, Ljiljana and Savić, Andrija and Castvan-Janković, Ivona and Lazarević, Slavica and Rogan, Jelena and Babić, Biljana and Petrović, Rada",
year = "2022",
abstract = "Carbon cryogel (CC) was impregnated with magnetite to produce a multifunctional magnetic adsorbent capable of removing phenoles and phosphates from water. Adsorbents were prepared via co-precipitation of Fe2+ and Fe3+ ions in aqueous solution in the presence of CC. Non-treated or acid-activated CC was used. The CC: Fe3O4 ratios of 1:1 and 3:1 were applied. The addition of HCl in the synthesis process was also investigated. XRD confirmed the formation of nanocrystalline magnetite. BET analysis showed that the pre-treatment diminished the CC porous structure, reducing also specific surface area (Sp). Formation of magnetite decreases Sp and total volume of micro and meso pores, but their distribution remained unchanged. FTIR spectra revealed that magnetite was attached to the surface of the acid activated CC via C═O bond. DTA-TGA and SEM indicated that acid treatment and presence of HCl were beneficial for homogeneous nucleation and distribution of magnetite, increasing adsorption properties of composite. Batch adsorption proved that the maximum adsorption capacity for phenoles was accomplished with 3:1 ratio with non-treated CC. Samples synthesized with pre- treated CC, under 1:1 ratio, gave the best results for phosphate removal. The CC/magnetite composite was found as promising adsorbent for the simultaneous removal of both polutants.",
publisher = "Banja Luka : University PIM",
journal = "XI International conference on social and technological development - STED 2022 : book of abstracts, Trebinje, June 2-5, 2022",
title = "Carbon Cryogel Magnetite Composites-Effective Adsorbents for the Phosphate and Phenol Removal from Water",
pages = "92",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10664"
}

Živković, L., Savić, A., Castvan-Janković, I., Lazarević, S., Rogan, J., Babić, B.,& Petrović, R.. (2022). Carbon Cryogel Magnetite Composites-Effective Adsorbents for the Phosphate and Phenol Removal from Water. in XI International conference on social and technological development - STED 2022 : book of abstracts, Trebinje, June 2-5, 2022
Banja Luka : University PIM., 92.
https://hdl.handle.net/21.15107/rcub_vinar_10664

Živković L, Savić A, Castvan-Janković I, Lazarević S, Rogan J, Babić B, Petrović R. Carbon Cryogel Magnetite Composites-Effective Adsorbents for the Phosphate and Phenol Removal from Water. in XI International conference on social and technological development - STED 2022 : book of abstracts, Trebinje, June 2-5, 2022. 2022;:92.
https://hdl.handle.net/21.15107/rcub_vinar_10664 .

Živković, Ljiljana, Savić, Andrija, Castvan-Janković, Ivona, Lazarević, Slavica, Rogan, Jelena, Babić, Biljana, Petrović, Rada, "Carbon Cryogel Magnetite Composites-Effective Adsorbents for the Phosphate and Phenol Removal from Water" in XI International conference on social and technological development - STED 2022 : book of abstracts, Trebinje, June 2-5, 2022 (2022):92,
https://hdl.handle.net/21.15107/rcub_vinar_10664 .

TY  - CONF
AU  - Matić, Tamara
AU  - Cvijović-Alagić, Ivana
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
AU  - Veljović, Đorđe
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10843
AB  - Calcium hydroxyapatite (HAP) presents the main mineral component of human bones and teeth, and thus is widely used bioceramic material for thehard tissue repair and regeneration. The biological HAP is never found pure in nature butdoped with multiple therapeutic ions, such as Cu, Mg, Sr, Zn, etc., which are found to play important roles in bone metabolism and growth. Hence, foreign cations have been introduced into the synthetic calcium hydroxyapatite, in order to induce a specific biological response after implementation, such as osteogenesis, angiogenesis, improved cell attachment and proliferation. However, the presence of the cations leads to the lattice distortion of the calcium-hydroxyapatite, resulting in different physico-chemical and mechanical properties. The hydrothermal synthesis of calcium hydroxyapatite leads to nanosized rod-like particles, which were found to possess properties close to those of the biological HAP. The aim of this study was to investigate the effect of hydrothermal synthesis parameters on physico-chemical and mechanical properties of mono- and binary cation-doped calcium hydroxyapatite by employing XRD, SEM and Hardness by Vickers tests. The temperature applied during the hydrothermal synthesis (150- 180 °C) was found to influence the hardness of the HAP based compacts sintered at 1200 °C.
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  - The effect of hydrothermal synthesis parameters on cation-doped calciumhydroxyapatite
SP  - 84
EP  - 85
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10843
ER  - 

@conference{
author = "Matić, Tamara and Cvijović-Alagić, Ivana and Petrović, Rada and Janaćković, Đorđe and Veljović, Đorđe",
year = "2021",
abstract = "Calcium hydroxyapatite (HAP) presents the main mineral component of human bones and teeth, and thus is widely used bioceramic material for thehard tissue repair and regeneration. The biological HAP is never found pure in nature butdoped with multiple therapeutic ions, such as Cu, Mg, Sr, Zn, etc., which are found to play important roles in bone metabolism and growth. Hence, foreign cations have been introduced into the synthetic calcium hydroxyapatite, in order to induce a specific biological response after implementation, such as osteogenesis, angiogenesis, improved cell attachment and proliferation. However, the presence of the cations leads to the lattice distortion of the calcium-hydroxyapatite, resulting in different physico-chemical and mechanical properties. The hydrothermal synthesis of calcium hydroxyapatite leads to nanosized rod-like particles, which were found to possess properties close to those of the biological HAP. The aim of this study was to investigate the effect of hydrothermal synthesis parameters on physico-chemical and mechanical properties of mono- and binary cation-doped calcium hydroxyapatite by employing XRD, SEM and Hardness by Vickers tests. The temperature applied during the hydrothermal synthesis (150- 180 °C) was found to influence the hardness of the HAP based compacts sintered at 1200 °C.",
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 = "The effect of hydrothermal synthesis parameters on cation-doped calciumhydroxyapatite",
pages = "84-85",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10843"
}

Matić, T., Cvijović-Alagić, I., Petrović, R., Janaćković, Đ.,& Veljović, Đ.. (2021). The effect of hydrothermal synthesis parameters on cation-doped calciumhydroxyapatite. 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., 84-85.
https://hdl.handle.net/21.15107/rcub_vinar_10843

Matić T, Cvijović-Alagić I, Petrović R, Janaćković Đ, Veljović Đ. The effect of hydrothermal synthesis parameters on cation-doped calciumhydroxyapatite. in Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade. 2021;:84-85.
https://hdl.handle.net/21.15107/rcub_vinar_10843 .

Matić, Tamara, Cvijović-Alagić, Ivana, Petrović, Rada, Janaćković, Đorđe, Veljović, Đorđe, "The effect of hydrothermal synthesis parameters on cation-doped calciumhydroxyapatite" in Advanced Ceramics and Application : 9th Serbian Ceramic Society Conference : program and the book of abstracts; September 20-21, 2021; Belgrade (2021):84-85,
https://hdl.handle.net/21.15107/rcub_vinar_10843 .

TY  - JOUR
AU  - Bjelajac, Anđelika
AU  - Petrović, Rada
AU  - Popović, Maja
AU  - Rakočević, Zlatko Lj.
AU  - Socol, Gabriel
AU  - Mihailescu, Ion N.
AU  - Janaćković, Đorđe T.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8589
AB  - The ∼60 nm wide and ∼2 μm long TiO2 nanotubes were obtained by anodization of Ti films sputtered on F-doped tin oxide glass. For N-doping the samples were annealed in ammonia atmosphere. The effect of pre- and post-annealing in air on the nature and amount of incorporated N was studied by X-ray photoelectron spectroscopy. By measuring the absorption spectra of the obtained samples and interpreting the corresponding Tauc plots it was shown that the sample annealed just in ammonia showed the highest visible light absorption even after sputtering cleaning and a decrease of N amount from 3.8% to 1%. Pre and/or post annealing in air led to smaller amount of incorporated N, that caused less pronounced absorption enhancement and smaller band gap narrowing compared to the sample annealed only in ammonia. By fitting of N 1 s line, the contribution that was assigned to substitutional N was detected only in the samples that did not sustained post-annealing. The study showed that post-annealing in air might lead to partial conversion of N atoms in TiO2 to oxidized nitrogen species that are easily removed with sputtering. It is also possible that substitutional nitrogen was suppressed by oxygen from air to move to interstitial site. Weakly bonded NOx surface species, which are cleaned away by sputtering, can be removed by post-annealing in air. Those surface species could act as sensitizers and when their amounts are reduced, the core absorption properties, as a result of interstitial incorporation of N in TiO2 structure, were revealed. Much lower visible light sensitization was achieved in the case of pre-annealed sample in comparison to sample without pre-annealing, regardless the same quantity and type of incorporated nitrogen.
T2  - Thin Solid Films
T1  - Doping of TiO2 nanotubes with nitrogen by annealing in ammonia for visible light activation: Influence of pre- and post-annealing in air
VL  - 692
SP  - 137598
DO  - 10.1016/j.tsf.2019.137598
ER  - 

@article{
author = "Bjelajac, Anđelika and Petrović, Rada and Popović, Maja and Rakočević, Zlatko Lj. and Socol, Gabriel and Mihailescu, Ion N. and Janaćković, Đorđe T.",
year = "2019",
abstract = "The ∼60 nm wide and ∼2 μm long TiO2 nanotubes were obtained by anodization of Ti films sputtered on F-doped tin oxide glass. For N-doping the samples were annealed in ammonia atmosphere. The effect of pre- and post-annealing in air on the nature and amount of incorporated N was studied by X-ray photoelectron spectroscopy. By measuring the absorption spectra of the obtained samples and interpreting the corresponding Tauc plots it was shown that the sample annealed just in ammonia showed the highest visible light absorption even after sputtering cleaning and a decrease of N amount from 3.8% to 1%. Pre and/or post annealing in air led to smaller amount of incorporated N, that caused less pronounced absorption enhancement and smaller band gap narrowing compared to the sample annealed only in ammonia. By fitting of N 1 s line, the contribution that was assigned to substitutional N was detected only in the samples that did not sustained post-annealing. The study showed that post-annealing in air might lead to partial conversion of N atoms in TiO2 to oxidized nitrogen species that are easily removed with sputtering. It is also possible that substitutional nitrogen was suppressed by oxygen from air to move to interstitial site. Weakly bonded NOx surface species, which are cleaned away by sputtering, can be removed by post-annealing in air. Those surface species could act as sensitizers and when their amounts are reduced, the core absorption properties, as a result of interstitial incorporation of N in TiO2 structure, were revealed. Much lower visible light sensitization was achieved in the case of pre-annealed sample in comparison to sample without pre-annealing, regardless the same quantity and type of incorporated nitrogen.",
journal = "Thin Solid Films",
title = "Doping of TiO2 nanotubes with nitrogen by annealing in ammonia for visible light activation: Influence of pre- and post-annealing in air",
volume = "692",
pages = "137598",
doi = "10.1016/j.tsf.2019.137598"
}

Bjelajac, A., Petrović, R., Popović, M., Rakočević, Z. Lj., Socol, G., Mihailescu, I. N.,& Janaćković, Đ. T.. (2019). Doping of TiO2 nanotubes with nitrogen by annealing in ammonia for visible light activation: Influence of pre- and post-annealing in air. in Thin Solid Films, 692, 137598.
https://doi.org/10.1016/j.tsf.2019.137598

Bjelajac A, Petrović R, Popović M, Rakočević ZL, Socol G, Mihailescu IN, Janaćković ĐT. Doping of TiO2 nanotubes with nitrogen by annealing in ammonia for visible light activation: Influence of pre- and post-annealing in air. in Thin Solid Films. 2019;692:137598.
doi:10.1016/j.tsf.2019.137598 .

Bjelajac, Anđelika, Petrović, Rada, Popović, Maja, Rakočević, Zlatko Lj., Socol, Gabriel, Mihailescu, Ion N., Janaćković, Đorđe T., "Doping of TiO2 nanotubes with nitrogen by annealing in ammonia for visible light activation: Influence of pre- and post-annealing in air" in Thin Solid Films, 692 (2019):137598,
https://doi.org/10.1016/j.tsf.2019.137598 . .

TY  - JOUR
AU  - Lazarević, Slavica
AU  - Marjanović, Vesna
AU  - Janković-Častvan, Ivona
AU  - Živković, Ljiljana
AU  - Janaćković, Đorđe T.
AU  - Petrović, Rada
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8594
AB  - Natural and acid-activated sepiolites, functionalized by covalent grafting of [3-(2-aminoethylamino) propyl]trimethoxy-silane were used as adsorbents for the removal of an anionic Reactive Orange 16 dye from aqueous solutions. The influence of initial pH (pHi) on the adsorption was first investigated in comparison with the adsorption onto unmodified sepiolites; then the dye removal process by modified samples was subjected to kinetic and equilibrium studies at pHi = 2.0 or 5.0, at different temperatures. Results showed that the adsorption of dye was favorable at lower pHi and at higher temperatures, in terms of adsorption capacity and rate of adsorption. The binding sites on the adsorbents surfaces were considered to be protonated amine groups, which play a role in the electrostatic interactions with the dye anions at pHi = 2.0. Formation of hydrogen bonds between hydrogen from amine groups and oxygen from the dye and van der Waals forces were proposed as the mechanisms of adsorption at pHi = 5.0. The adsorption kinetics was well fitted to the pseudo-second- order kinetic model, while the equilibrium adsorption data were well correlated with the Sips isotherm. The adsorption capacity of both modified sepiolites was much higher than of the parent samples, whereas the capacity of the functionalized acid-activated sepiolite was higher (~172 mg/g) than of the functionalized natural sepiolite (~158 mg/g) at 298 K, pHi 5.0.
T2  - Desalination and Water Treatment
T1  - Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites
VL  - 163
SP  - 376
EP  - 384
DO  - 10.5004/dwt.2019.24437
ER  - 

@article{
author = "Lazarević, Slavica and Marjanović, Vesna and Janković-Častvan, Ivona and Živković, Ljiljana and Janaćković, Đorđe T. and Petrović, Rada",
year = "2019",
abstract = "Natural and acid-activated sepiolites, functionalized by covalent grafting of [3-(2-aminoethylamino) propyl]trimethoxy-silane were used as adsorbents for the removal of an anionic Reactive Orange 16 dye from aqueous solutions. The influence of initial pH (pHi) on the adsorption was first investigated in comparison with the adsorption onto unmodified sepiolites; then the dye removal process by modified samples was subjected to kinetic and equilibrium studies at pHi = 2.0 or 5.0, at different temperatures. Results showed that the adsorption of dye was favorable at lower pHi and at higher temperatures, in terms of adsorption capacity and rate of adsorption. The binding sites on the adsorbents surfaces were considered to be protonated amine groups, which play a role in the electrostatic interactions with the dye anions at pHi = 2.0. Formation of hydrogen bonds between hydrogen from amine groups and oxygen from the dye and van der Waals forces were proposed as the mechanisms of adsorption at pHi = 5.0. The adsorption kinetics was well fitted to the pseudo-second- order kinetic model, while the equilibrium adsorption data were well correlated with the Sips isotherm. The adsorption capacity of both modified sepiolites was much higher than of the parent samples, whereas the capacity of the functionalized acid-activated sepiolite was higher (~172 mg/g) than of the functionalized natural sepiolite (~158 mg/g) at 298 K, pHi 5.0.",
journal = "Desalination and Water Treatment",
title = "Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites",
volume = "163",
pages = "376-384",
doi = "10.5004/dwt.2019.24437"
}

Lazarević, S., Marjanović, V., Janković-Častvan, I., Živković, L., Janaćković, Đ. T.,& Petrović, R.. (2019). Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites. in Desalination and Water Treatment, 163, 376-384.
https://doi.org/10.5004/dwt.2019.24437

Lazarević S, Marjanović V, Janković-Častvan I, Živković L, Janaćković ĐT, Petrović R. Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites. in Desalination and Water Treatment. 2019;163:376-384.
doi:10.5004/dwt.2019.24437 .

Lazarević, Slavica, Marjanović, Vesna, Janković-Častvan, Ivona, Živković, Ljiljana, Janaćković, Đorđe T., Petrović, Rada, "Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites" in Desalination and Water Treatment, 163 (2019):376-384,
https://doi.org/10.5004/dwt.2019.24437 . .