TY  - JOUR
AU  - Milojkov, Dušan V.
AU  - Radosavljević-Mihajlović, Ana S.
AU  - Stanić, Vojislav
AU  - Nastasijević, Branislav J.
AU  - Radotić, Ksenija
AU  - Janković-Častvan, Ivona
AU  - Živković-Radovanović, Vukosava
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10612
AB  - Nanomaterials based on metal–doped fluorapatite (FAP) have attracted considerable interest as potential next–generation antimicrobial agents. In this study, Cu2+–doped FAP nanocrystals have been successfully synthesized by a neutralization method at room temperature. Their structural, optical, antimicrobial, and hemcompatible properties have been investigated. XRD, FTIR, FESEM, and N2 adsorption–desorption studies indicate the formation of single–phase FAP mesoporous nanopowders, composed of rod–like particles. TEM images confirmed the formation of nanorodes with a length of 60 nm and a width of about 18 nm. Rietveld analysis shows that the Cu2+ ions preferentially substitute Ca2 (6 h) sites in the hexagonal fluorapatite crystal structure. Fluorescence spectroscopy accompanied by MCR–ALS method confirms substitution of Cu2+ ions in FAP crystal lattice with extracting additional d–d band transition at green color from FAP broadband self–activated luminescence in violet–blue color. Antimicrobial studies conducted on Staphylococcus aureus, Escherichia coli and Micrococcus lysodeikticus showed that FAP nanopowder with the highest Cu2+ content have strong bacteriostatic action on Staphylococcus aureus bacterial strain in mediums containing nutrition matters. In addition, this sample in comparison to pure FAP achieved a high percentage of relative reduction of bacterial population for all three species, being >90% in most cases. Fungistatic action is noticed too, throwgh the slowing down mycelium growth of fungus Aspergillus niger, Aspergillus flavus and Penicillium roqueforti and reduction of sporulation of Aspergillus niger species. Cu2+–doped FAP nanocrystals shows a synergistic antimicrobial effect with Cu2+ and F− ions. Concerning the potential biomedical applications, the hemolysis ratios of the Cu2+–doped FAP samples were below 5%. The obtained results pointed out the possible use of the synthesized nanocrystals as broad–spectrum antimicrobial agents for various biomedical and health care preparations.
T2  - Journal of Photochemistry and Photobiology B: Biology
T1  - Synthesis and characterization of luminescent Cu2+–doped fluorapatite nanocrystals as potential broad–spectrum antimicrobial agents
VL  - 239
SP  - 112649
DO  - 10.1016/j.jphotobiol.2023.112649
ER  - 

@article{
author = "Milojkov, Dušan V. and Radosavljević-Mihajlović, Ana S. and Stanić, Vojislav and Nastasijević, Branislav J. and Radotić, Ksenija and Janković-Častvan, Ivona and Živković-Radovanović, Vukosava",
year = "2023",
abstract = "Nanomaterials based on metal–doped fluorapatite (FAP) have attracted considerable interest as potential next–generation antimicrobial agents. In this study, Cu2+–doped FAP nanocrystals have been successfully synthesized by a neutralization method at room temperature. Their structural, optical, antimicrobial, and hemcompatible properties have been investigated. XRD, FTIR, FESEM, and N2 adsorption–desorption studies indicate the formation of single–phase FAP mesoporous nanopowders, composed of rod–like particles. TEM images confirmed the formation of nanorodes with a length of 60 nm and a width of about 18 nm. Rietveld analysis shows that the Cu2+ ions preferentially substitute Ca2 (6 h) sites in the hexagonal fluorapatite crystal structure. Fluorescence spectroscopy accompanied by MCR–ALS method confirms substitution of Cu2+ ions in FAP crystal lattice with extracting additional d–d band transition at green color from FAP broadband self–activated luminescence in violet–blue color. Antimicrobial studies conducted on Staphylococcus aureus, Escherichia coli and Micrococcus lysodeikticus showed that FAP nanopowder with the highest Cu2+ content have strong bacteriostatic action on Staphylococcus aureus bacterial strain in mediums containing nutrition matters. In addition, this sample in comparison to pure FAP achieved a high percentage of relative reduction of bacterial population for all three species, being >90% in most cases. Fungistatic action is noticed too, throwgh the slowing down mycelium growth of fungus Aspergillus niger, Aspergillus flavus and Penicillium roqueforti and reduction of sporulation of Aspergillus niger species. Cu2+–doped FAP nanocrystals shows a synergistic antimicrobial effect with Cu2+ and F− ions. Concerning the potential biomedical applications, the hemolysis ratios of the Cu2+–doped FAP samples were below 5%. The obtained results pointed out the possible use of the synthesized nanocrystals as broad–spectrum antimicrobial agents for various biomedical and health care preparations.",
journal = "Journal of Photochemistry and Photobiology B: Biology",
title = "Synthesis and characterization of luminescent Cu2+–doped fluorapatite nanocrystals as potential broad–spectrum antimicrobial agents",
volume = "239",
pages = "112649",
doi = "10.1016/j.jphotobiol.2023.112649"
}

Milojkov, D. V., Radosavljević-Mihajlović, A. S., Stanić, V., Nastasijević, B. J., Radotić, K., Janković-Častvan, I.,& Živković-Radovanović, V.. (2023). Synthesis and characterization of luminescent Cu2+–doped fluorapatite nanocrystals as potential broad–spectrum antimicrobial agents. in Journal of Photochemistry and Photobiology B: Biology, 239, 112649.
https://doi.org/10.1016/j.jphotobiol.2023.112649

Milojkov DV, Radosavljević-Mihajlović AS, Stanić V, Nastasijević BJ, Radotić K, Janković-Častvan I, Živković-Radovanović V. Synthesis and characterization of luminescent Cu2+–doped fluorapatite nanocrystals as potential broad–spectrum antimicrobial agents. in Journal of Photochemistry and Photobiology B: Biology. 2023;239:112649.
doi:10.1016/j.jphotobiol.2023.112649 .

Milojkov, Dušan V., Radosavljević-Mihajlović, Ana S., Stanić, Vojislav, Nastasijević, Branislav J., Radotić, Ksenija, Janković-Častvan, Ivona, Živković-Radovanović, Vukosava, "Synthesis and characterization of luminescent Cu2+–doped fluorapatite nanocrystals as potential broad–spectrum antimicrobial agents" in Journal of Photochemistry and Photobiology B: Biology, 239 (2023):112649,
https://doi.org/10.1016/j.jphotobiol.2023.112649 . .

TY  - JOUR
AU  - Stanković, Dalibor M.
AU  - Kukuruzar, Andrej
AU  - Savić, Slađana
AU  - Ognjanović, Miloš
AU  - Janković-Častvan, Ivona
AU  - Roglić, Goran
AU  - Antić, Bratislav
AU  - Manojlović, Dragan
AU  - Dojčinović, Biljana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9902
AB  - The textile industry is one of the major pollutants of waterbodies with effluents high in biochemical and chemical oxygen demand values, high values of total dissolved solids, total suspended solids, and low dissolved oxygen values along with strong color. The existence of a successful method for its decontamination would be beneficial. In this work, we synthesized sponge-like europium oxide (Eu2O3) using a template-directed route from carbon hollow spheres, obtained from glucose as a carbon source. The material synthesis method was done in an aqueous environment, without using any organic solvents. Electrochemical properties of the synthesized material were investigated using cyclic voltammetry and electrical impedance spectroscopy, while morphological characterization was done using scanning electron microscopy and X-ray powder diffraction analysis. Eu2O3 were successfully immobilized at the surface of a screen-printed carbon electrode (Eu2O3/SPCE) using the drop-casting method. Finally, the prepared electrodes were tested toward the removal of Reactive Blue 52 (RB52) using electrochemical advanced oxidation processes (EAOPs). Important parameters, that is, the supporting electrolyte, its concentration, pH value, and the applied voltage, were optimized for RB52 degradation. The rate of removal was monitored spectrophotometrically and by high-performance liquid chromatography with a diode array detector (HPLC-DAD). It was found that the proposed approach reaches complete decolorization of the RB52 solution after a 60-min treatment, at pH 5.6 of KCl supporting electrolyte at a concentration of 0.05 M. Under optimal parameters, after 3 h of treatment, total organic carbon (TOC) was lowered by ~40%. The obtained results indicate that the proposed method may find potential application in EAOPs, considering electrode stability, durability, and efficiency and simplicity of the method.
T2  - Materials Chemistry and Physics
T1  - Sponge-like europium oxide from hollow carbon sphere as a template for an anode material for Reactive Blue 52 electrochemical degradation
VL  - 273
SP  - 125154
DO  - 10.1016/j.matchemphys.2021.125154
ER  - 

@article{
author = "Stanković, Dalibor M. and Kukuruzar, Andrej and Savić, Slađana and Ognjanović, Miloš and Janković-Častvan, Ivona and Roglić, Goran and Antić, Bratislav and Manojlović, Dragan and Dojčinović, Biljana",
year = "2021",
abstract = "The textile industry is one of the major pollutants of waterbodies with effluents high in biochemical and chemical oxygen demand values, high values of total dissolved solids, total suspended solids, and low dissolved oxygen values along with strong color. The existence of a successful method for its decontamination would be beneficial. In this work, we synthesized sponge-like europium oxide (Eu2O3) using a template-directed route from carbon hollow spheres, obtained from glucose as a carbon source. The material synthesis method was done in an aqueous environment, without using any organic solvents. Electrochemical properties of the synthesized material were investigated using cyclic voltammetry and electrical impedance spectroscopy, while morphological characterization was done using scanning electron microscopy and X-ray powder diffraction analysis. Eu2O3 were successfully immobilized at the surface of a screen-printed carbon electrode (Eu2O3/SPCE) using the drop-casting method. Finally, the prepared electrodes were tested toward the removal of Reactive Blue 52 (RB52) using electrochemical advanced oxidation processes (EAOPs). Important parameters, that is, the supporting electrolyte, its concentration, pH value, and the applied voltage, were optimized for RB52 degradation. The rate of removal was monitored spectrophotometrically and by high-performance liquid chromatography with a diode array detector (HPLC-DAD). It was found that the proposed approach reaches complete decolorization of the RB52 solution after a 60-min treatment, at pH 5.6 of KCl supporting electrolyte at a concentration of 0.05 M. Under optimal parameters, after 3 h of treatment, total organic carbon (TOC) was lowered by ~40%. The obtained results indicate that the proposed method may find potential application in EAOPs, considering electrode stability, durability, and efficiency and simplicity of the method.",
journal = "Materials Chemistry and Physics",
title = "Sponge-like europium oxide from hollow carbon sphere as a template for an anode material for Reactive Blue 52 electrochemical degradation",
volume = "273",
pages = "125154",
doi = "10.1016/j.matchemphys.2021.125154"
}

Stanković, D. M., Kukuruzar, A., Savić, S., Ognjanović, M., Janković-Častvan, I., Roglić, G., Antić, B., Manojlović, D.,& Dojčinović, B.. (2021). Sponge-like europium oxide from hollow carbon sphere as a template for an anode material for Reactive Blue 52 electrochemical degradation. in Materials Chemistry and Physics, 273, 125154.
https://doi.org/10.1016/j.matchemphys.2021.125154

Stanković DM, Kukuruzar A, Savić S, Ognjanović M, Janković-Častvan I, Roglić G, Antić B, Manojlović D, Dojčinović B. Sponge-like europium oxide from hollow carbon sphere as a template for an anode material for Reactive Blue 52 electrochemical degradation. in Materials Chemistry and Physics. 2021;273:125154.
doi:10.1016/j.matchemphys.2021.125154 .

Stanković, Dalibor M., Kukuruzar, Andrej, Savić, Slađana, Ognjanović, Miloš, Janković-Častvan, Ivona, Roglić, Goran, Antić, Bratislav, Manojlović, Dragan, Dojčinović, Biljana, "Sponge-like europium oxide from hollow carbon sphere as a template for an anode material for Reactive Blue 52 electrochemical degradation" in Materials Chemistry and Physics, 273 (2021):125154,
https://doi.org/10.1016/j.matchemphys.2021.125154 . .

TY  - JOUR
AU  - Lazić, Vesna M.
AU  - Pirković, Andrea
AU  - Sredojević, Dušan
AU  - Marković, Jelena P.
AU  - Papan, Jelena
AU  - Ahrenkiel, S. Phillip
AU  - Janković-Častvan, Ivona
AU  - Dekanski, Dragana
AU  - Jovanović Krivokuća, Milica
AU  - Nedeljković, Jovan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9897
AB  - The toxicity of hybrid nanoparticles, consisting of non-toxic components, zirconium dioxide nanoparticles (ZrO2 NPs), and caffeic acid (CA), was examined against four different cell lines (HTR-8 SV/Neo, JEG-3, JAR, and HeLa). Stable aqueous ZrO2 sol, synthesized by forced hydrolysis, consists of 3–4 nm in size primary particles organized in 30–60 nm in size snowflake-like particles, as determined by transmission electron microscopy and direct light scattering measurements. The surface modification of ZrO2 NPs with CA leads to the formation of an interfacial charge transfer (ICT) complex followed by the appearance of absorption in the visible spectral range. The spectroscopic observations are complemented with the density functional theory calculations using a cluster model. The ZrO2 NPs and CA are non-toxic against four different cell lines in investigated concentration range. Also, ZrO2 NPs promote the proliferation of HTR-8 SV/Neo, JAR, and HeLa cells. On the other hand, hybrid ZrO2/CA NPs induced a significant reduction of the viability of the JEG-3 cells (39 %) for the high concentration of components (1.6 mM ZrO2 and 0.4 mM CA).
T2  - Chemico-Biological Interactions
T1  - Surface-modified ZrO2 nanoparticles with caffeic acid: Characterization and in vitro evaluation of biosafety for placental cells
VL  - 347
SP  - 109618
DO  - 10.1016/j.cbi.2021.109618
ER  - 

@article{
author = "Lazić, Vesna M. and Pirković, Andrea and Sredojević, Dušan and Marković, Jelena P. and Papan, Jelena and Ahrenkiel, S. Phillip and Janković-Častvan, Ivona and Dekanski, Dragana and Jovanović Krivokuća, Milica and Nedeljković, Jovan",
year = "2021",
abstract = "The toxicity of hybrid nanoparticles, consisting of non-toxic components, zirconium dioxide nanoparticles (ZrO2 NPs), and caffeic acid (CA), was examined against four different cell lines (HTR-8 SV/Neo, JEG-3, JAR, and HeLa). Stable aqueous ZrO2 sol, synthesized by forced hydrolysis, consists of 3–4 nm in size primary particles organized in 30–60 nm in size snowflake-like particles, as determined by transmission electron microscopy and direct light scattering measurements. The surface modification of ZrO2 NPs with CA leads to the formation of an interfacial charge transfer (ICT) complex followed by the appearance of absorption in the visible spectral range. The spectroscopic observations are complemented with the density functional theory calculations using a cluster model. The ZrO2 NPs and CA are non-toxic against four different cell lines in investigated concentration range. Also, ZrO2 NPs promote the proliferation of HTR-8 SV/Neo, JAR, and HeLa cells. On the other hand, hybrid ZrO2/CA NPs induced a significant reduction of the viability of the JEG-3 cells (39 %) for the high concentration of components (1.6 mM ZrO2 and 0.4 mM CA).",
journal = "Chemico-Biological Interactions",
title = "Surface-modified ZrO2 nanoparticles with caffeic acid: Characterization and in vitro evaluation of biosafety for placental cells",
volume = "347",
pages = "109618",
doi = "10.1016/j.cbi.2021.109618"
}

Lazić, V. M., Pirković, A., Sredojević, D., Marković, J. P., Papan, J., Ahrenkiel, S. P., Janković-Častvan, I., Dekanski, D., Jovanović Krivokuća, M.,& Nedeljković, J.. (2021). Surface-modified ZrO2 nanoparticles with caffeic acid: Characterization and in vitro evaluation of biosafety for placental cells. in Chemico-Biological Interactions, 347, 109618.
https://doi.org/10.1016/j.cbi.2021.109618

Lazić VM, Pirković A, Sredojević D, Marković JP, Papan J, Ahrenkiel SP, Janković-Častvan I, Dekanski D, Jovanović Krivokuća M, Nedeljković J. Surface-modified ZrO2 nanoparticles with caffeic acid: Characterization and in vitro evaluation of biosafety for placental cells. in Chemico-Biological Interactions. 2021;347:109618.
doi:10.1016/j.cbi.2021.109618 .

Lazić, Vesna M., Pirković, Andrea, Sredojević, Dušan, Marković, Jelena P., Papan, Jelena, Ahrenkiel, S. Phillip, Janković-Častvan, Ivona, Dekanski, Dragana, Jovanović Krivokuća, Milica, Nedeljković, Jovan, "Surface-modified ZrO2 nanoparticles with caffeic acid: Characterization and in vitro evaluation of biosafety for placental cells" in Chemico-Biological Interactions, 347 (2021):109618,
https://doi.org/10.1016/j.cbi.2021.109618 . .

TY  - CONF
AU  - Prokić, Danijela
AU  - Vukčević, Marija
AU  - Maletić, Marina
AU  - Kalijadis, Ana
AU  - Babić, Biljana M.
AU  - Janković-Častvan, Ivona
AU  - Đurkić, Tatjana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11598
AB  - Za ekstrakciju estrogenih hormona (estrona, 17β-estradiola i 17α-etinilestradiola) iz vodenih rastvora metodom ekstrakcije na čvrstoj fazi, u ovom radu korišćen je ugljenični kriogel kao sorbent. Metoda ekstrakcije na čvrstoj fazi optimizovana je izborom odgovarajuće mase sorbenta, zapremine i početne pH vrednosti vodenog rastvora hormona, kao i odabirom organskog rastvarača za eluira-nje. Koncentracija ispitivanih hormona u rastvoru nakon ekstrakcije određivana je metodom tečne hromatografije visoke performance u sprezi sa tandem masenom spektrometrijom. Na osnovu prinosa ispitivanih hormona, dobijeni su optimalni parametri metode ekstrakcije na čvrstoj fazi za predkon-centrisanje hormona iz vodenog rastvora: ekstrakcija hormona iz 100 cm3 vodenog rastvora, početne pH vrednosti podešene na 7, vrši se na 20 mg sorpcionog materijala, a smeša dihlormetan/methanol koristi se kao organski rastvarač za eluiranje. Vrednosti prinosa, dobijenih pri optimalnim uslovima, iznosile su od 77 % za estron, do 86 % za 17β-estradiol, uz relativnu standardnu devijaciju od 7,4 do 18 %.
AB  - In this study, carbon cryogel was used as solid-phase extraction sorbent for the extraction of estrogenic hormones (estrone, 17β-estradiol, and 17α-ethinylestradiol) from water solution.
The solid-phase extraction (SPE) method was optimized by choosing an appropriate mass of the sorbent, volume, and initial pH of estrogenic hormone water solution, as well as by choosing an appropriate organic solvent. The concentration of tested hormones after extraction was measured by liquid
chromatography coupled with tandem mass spectrometry. Based on the obtained hormone recoveries, the following optimal conditions of the SPE procedure were chosen: 100 cm3
of hormone water
solution at initial pH adjusted to 7, 20 mg of the sorbent, the methanol-dichloromethane mixture was
used for hormone elution. Recoveries obtained under the optimal conditions ranged from 77 % for
estrone, to 86 % for 17β-estradiol, with relative standard deviation from 7,4 to 18 %.
PB  - Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS) : Društvo za procesnu tehniku
C3  - 34. Međunarodni kongres o procesnoj industriji - PROCESING ′21 : zbornik radova
T1  - Ekstrakcija estrogenih hormona iz vode korišćenjem ugljeničnog kriogela kao sorbenta
T1  - Extraction of estrogen hormones from water using
carbon cryogel as sorbent
SP  - 123
EP  - 127
DO  - 10.24094/ptk.021.34.1.123
ER  - 

@conference{
author = "Prokić, Danijela and Vukčević, Marija and Maletić, Marina and Kalijadis, Ana and Babić, Biljana M. and Janković-Častvan, Ivona and Đurkić, Tatjana",
year = "2021",
abstract = "Za ekstrakciju estrogenih hormona (estrona, 17β-estradiola i 17α-etinilestradiola) iz vodenih rastvora metodom ekstrakcije na čvrstoj fazi, u ovom radu korišćen je ugljenični kriogel kao sorbent. Metoda ekstrakcije na čvrstoj fazi optimizovana je izborom odgovarajuće mase sorbenta, zapremine i početne pH vrednosti vodenog rastvora hormona, kao i odabirom organskog rastvarača za eluira-nje. Koncentracija ispitivanih hormona u rastvoru nakon ekstrakcije određivana je metodom tečne hromatografije visoke performance u sprezi sa tandem masenom spektrometrijom. Na osnovu prinosa ispitivanih hormona, dobijeni su optimalni parametri metode ekstrakcije na čvrstoj fazi za predkon-centrisanje hormona iz vodenog rastvora: ekstrakcija hormona iz 100 cm3 vodenog rastvora, početne pH vrednosti podešene na 7, vrši se na 20 mg sorpcionog materijala, a smeša dihlormetan/methanol koristi se kao organski rastvarač za eluiranje. Vrednosti prinosa, dobijenih pri optimalnim uslovima, iznosile su od 77 % za estron, do 86 % za 17β-estradiol, uz relativnu standardnu devijaciju od 7,4 do 18 %., In this study, carbon cryogel was used as solid-phase extraction sorbent for the extraction of estrogenic hormones (estrone, 17β-estradiol, and 17α-ethinylestradiol) from water solution.
The solid-phase extraction (SPE) method was optimized by choosing an appropriate mass of the sorbent, volume, and initial pH of estrogenic hormone water solution, as well as by choosing an appropriate organic solvent. The concentration of tested hormones after extraction was measured by liquid
chromatography coupled with tandem mass spectrometry. Based on the obtained hormone recoveries, the following optimal conditions of the SPE procedure were chosen: 100 cm3
of hormone water
solution at initial pH adjusted to 7, 20 mg of the sorbent, the methanol-dichloromethane mixture was
used for hormone elution. Recoveries obtained under the optimal conditions ranged from 77 % for
estrone, to 86 % for 17β-estradiol, with relative standard deviation from 7,4 to 18 %.",
publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS) : Društvo za procesnu tehniku",
journal = "34. Međunarodni kongres o procesnoj industriji - PROCESING ′21 : zbornik radova",
title = "Ekstrakcija estrogenih hormona iz vode korišćenjem ugljeničnog kriogela kao sorbenta, Extraction of estrogen hormones from water using
carbon cryogel as sorbent",
pages = "123-127",
doi = "10.24094/ptk.021.34.1.123"
}

Prokić, D., Vukčević, M., Maletić, M., Kalijadis, A., Babić, B. M., Janković-Častvan, I.,& Đurkić, T.. (2021). Ekstrakcija estrogenih hormona iz vode korišćenjem ugljeničnog kriogela kao sorbenta. in 34. Međunarodni kongres o procesnoj industriji - PROCESING ′21 : zbornik radova
Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS) : Društvo za procesnu tehniku., 123-127.
https://doi.org/10.24094/ptk.021.34.1.123

Prokić D, Vukčević M, Maletić M, Kalijadis A, Babić BM, Janković-Častvan I, Đurkić T. Ekstrakcija estrogenih hormona iz vode korišćenjem ugljeničnog kriogela kao sorbenta. in 34. Međunarodni kongres o procesnoj industriji - PROCESING ′21 : zbornik radova. 2021;:123-127.
doi:10.24094/ptk.021.34.1.123 .

Prokić, Danijela, Vukčević, Marija, Maletić, Marina, Kalijadis, Ana, Babić, Biljana M., Janković-Častvan, Ivona, Đurkić, Tatjana, "Ekstrakcija estrogenih hormona iz vode korišćenjem ugljeničnog kriogela kao sorbenta" in 34. Međunarodni kongres o procesnoj industriji - PROCESING ′21 : zbornik radova (2021):123-127,
https://doi.org/10.24094/ptk.021.34.1.123 . .

TY  - JOUR
AU  - Ivanović, Marija M.
AU  - Kljajević, Ljiljana M.
AU  - Gulicovski, Jelena J.
AU  - Petković, Marijana
AU  - Janković-Častvan, Ivona
AU  - Bučevac, Dušan
AU  - Nenadović, Snežana S.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9642
AB  - This paper outlines the production of an inorganic polymer/geopolymer using a metakaolin by an environmental friendly, energy saving, clean technology to conserve natural environment and resources. The influence of alkali activation, i.e. different concentration of NaOH as a component of alkali activator mixture on the process of geopolymerization of metakaolin is investigated. Also, process of aging time of geopolymer is followed by several analytical methods. The structure of metakaolin and metakaolin based geopolymers and their physicochemical properties were studied using X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR) and after 28 days scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) was applied for the surface characterization of the samples. A shift of the Si-O or Si-O-X (X=Al, Si, Na...) bands as the molarity of activator increasing during geopolymerization process was observed by FTIR. Mass spectra of geopolymers were characterized by MALDI TOF mass spectrometer. Structural reorganization of geopolymer samples occurs during the curing/aging in accordance with a geopolymerization mechanism.
T2  - Science of Sintering
T1  - The effect of the concentration of alkaline activator and aging time on the structure of metakaolin based geopolymer
VL  - 52
IS  - 2
SP  - 219
EP  - 229
DO  - 10.2298/SOS2002219I
ER  - 

@article{
author = "Ivanović, Marija M. and Kljajević, Ljiljana M. and Gulicovski, Jelena J. and Petković, Marijana and Janković-Častvan, Ivona and Bučevac, Dušan and Nenadović, Snežana S.",
year = "2020",
abstract = "This paper outlines the production of an inorganic polymer/geopolymer using a metakaolin by an environmental friendly, energy saving, clean technology to conserve natural environment and resources. The influence of alkali activation, i.e. different concentration of NaOH as a component of alkali activator mixture on the process of geopolymerization of metakaolin is investigated. Also, process of aging time of geopolymer is followed by several analytical methods. The structure of metakaolin and metakaolin based geopolymers and their physicochemical properties were studied using X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR) and after 28 days scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) was applied for the surface characterization of the samples. A shift of the Si-O or Si-O-X (X=Al, Si, Na...) bands as the molarity of activator increasing during geopolymerization process was observed by FTIR. Mass spectra of geopolymers were characterized by MALDI TOF mass spectrometer. Structural reorganization of geopolymer samples occurs during the curing/aging in accordance with a geopolymerization mechanism.",
journal = "Science of Sintering",
title = "The effect of the concentration of alkaline activator and aging time on the structure of metakaolin based geopolymer",
volume = "52",
number = "2",
pages = "219-229",
doi = "10.2298/SOS2002219I"
}

Ivanović, M. M., Kljajević, L. M., Gulicovski, J. J., Petković, M., Janković-Častvan, I., Bučevac, D.,& Nenadović, S. S.. (2020). The effect of the concentration of alkaline activator and aging time on the structure of metakaolin based geopolymer. in Science of Sintering, 52(2), 219-229.
https://doi.org/10.2298/SOS2002219I

Ivanović MM, Kljajević LM, Gulicovski JJ, Petković M, Janković-Častvan I, Bučevac D, Nenadović SS. The effect of the concentration of alkaline activator and aging time on the structure of metakaolin based geopolymer. in Science of Sintering. 2020;52(2):219-229.
doi:10.2298/SOS2002219I .

Ivanović, Marija M., Kljajević, Ljiljana M., Gulicovski, Jelena J., Petković, Marijana, Janković-Častvan, Ivona, Bučevac, Dušan, Nenadović, Snežana S., "The effect of the concentration of alkaline activator and aging time on the structure of metakaolin based geopolymer" in Science of Sintering, 52, no. 2 (2020):219-229,
https://doi.org/10.2298/SOS2002219I . .

TY  - JOUR
AU  - Vasiljević, Zorka
AU  - Dojčinović, Milena
AU  - Vujančević, Jelena
AU  - Janković-Častvan, Ivona
AU  - Ognjanović, Miloš
AU  - Tadić, Nenad B.
AU  - Stojadinović, Stevan
AU  - Branković, Goran O.
AU  - Nikolić, Maria Vesna
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9706
AB  - The aim of this work was to synthesize semiconducting oxide nanoparticles using a simple method with low production cost to be applied in natural sunlight for photocatalytic degradation of pollutants in waste water. Iron titanate (Fe2TiO5) nanoparticles with an orthorhombic structure were successfully synthesized using a modified sol–gel method and calcination at 750°C. The as-prepared Fe2TiO5 nanoparticles exhibited a moderate specific surface area. The mesoporous Fe2TiO5 nanoparticles possessed strong absorption in the visible-light region and the band gap was estimated to be around 2.16 eV. The photocatalytic activity was evaluated by the degradation of methylene blue under natural sunlight. The effect of parameters such as the amount of catalyst, initial concentration of the dye and pH of the dye solution on the removal efficiency of methylene blue was investigated. Fe2TiO5 showed high degradation efficiency in a strong alkaline medium that can be the result of the facilitated formation of OH radicals due to an increased concentration of hydroxyl ions.
T2  - Royal Society Open Science
T1  - Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method
VL  - 7
IS  - 9
SP  - 200708
DO  - 10.1098/rsos.200708
ER  - 

@article{
author = "Vasiljević, Zorka and Dojčinović, Milena and Vujančević, Jelena and Janković-Častvan, Ivona and Ognjanović, Miloš and Tadić, Nenad B. and Stojadinović, Stevan and Branković, Goran O. and Nikolić, Maria Vesna",
year = "2020",
abstract = "The aim of this work was to synthesize semiconducting oxide nanoparticles using a simple method with low production cost to be applied in natural sunlight for photocatalytic degradation of pollutants in waste water. Iron titanate (Fe2TiO5) nanoparticles with an orthorhombic structure were successfully synthesized using a modified sol–gel method and calcination at 750°C. The as-prepared Fe2TiO5 nanoparticles exhibited a moderate specific surface area. The mesoporous Fe2TiO5 nanoparticles possessed strong absorption in the visible-light region and the band gap was estimated to be around 2.16 eV. The photocatalytic activity was evaluated by the degradation of methylene blue under natural sunlight. The effect of parameters such as the amount of catalyst, initial concentration of the dye and pH of the dye solution on the removal efficiency of methylene blue was investigated. Fe2TiO5 showed high degradation efficiency in a strong alkaline medium that can be the result of the facilitated formation of OH radicals due to an increased concentration of hydroxyl ions.",
journal = "Royal Society Open Science",
title = "Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method",
volume = "7",
number = "9",
pages = "200708",
doi = "10.1098/rsos.200708"
}

Vasiljević, Z., Dojčinović, M., Vujančević, J., Janković-Častvan, I., Ognjanović, M., Tadić, N. B., Stojadinović, S., Branković, G. O.,& Nikolić, M. V.. (2020). Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method. in Royal Society Open Science, 7(9), 200708.
https://doi.org/10.1098/rsos.200708

Vasiljević Z, Dojčinović M, Vujančević J, Janković-Častvan I, Ognjanović M, Tadić NB, Stojadinović S, Branković GO, Nikolić MV. Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method. in Royal Society Open Science. 2020;7(9):200708.
doi:10.1098/rsos.200708 .

Vasiljević, Zorka, Dojčinović, Milena, Vujančević, Jelena, Janković-Častvan, Ivona, Ognjanović, Miloš, Tadić, Nenad B., Stojadinović, Stevan, Branković, Goran O., Nikolić, Maria Vesna, "Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method" in Royal Society Open Science, 7, no. 9 (2020):200708,
https://doi.org/10.1098/rsos.200708 . .

TY  - JOUR
AU  - Savić, Andrija B.
AU  - Čokeša, Đuro
AU  - Savić-Biserčić, Marjetka
AU  - Janković-Častvan, Ivona
AU  - Petrović, Rada
AU  - Živković, Ljiljana
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0921883119301529
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8221
AB  - Natural filtration material tuff (T) was modified by coating with nano-sized magnetite. The grain fraction of 0.6–1.9 mm was submitted to hydrothermal synthesis of magnetite. Thus formed magnetite modified tuff (MMT) was characterized in terms of Fe-content, N2 adsorption- desorption isotherm, SEM, zeta potential-pH analyses and adsorption behavior towards phosphates/arsenates in batch and column conditions. Elemental analysis showed that 36.54 mg g−1 of magnetite was attached to the porous tuff grains. This modification changed pore structure and specific surface area. An increase of cca 35% in Sp value was obtained. Batch experiments proved that MMT was 4-5 times more efficient in removal of phosphates/arsenates than non-modified T. The maximum sorption capacities of phosphates calculated based on Langmuir equation were 0.45 and 1.91 mg g−1, while those for arsenate were 0.551 m g−1 and 2.36 mg g−1 for T and MMT, respectively. The intra-particle diffusion model was the most suited for describing the adsorption process of phosphate and arsenate onto MMT. Fixed-bed column data corroborated batch results, i.e. MMT was 6 times superior in contaminant adsorption than T. Modification with magnetite improved T potential for usage in water treatment applications: its filtration ability remained unchanged, while adsorption capacity for phosphates/arsenates removal was improved. © 2019 The Society of Powder Technology Japan
T2  - Advanced Powder Technology
T1  - Multifunctional use of magnetite-coated tuff grains in water treatment: Removal of arsenates and phosphates
VL  - 30
IS  - 8
SP  - 1687
EP  - 1695
DO  - 10.1016/j.apt.2019.05.020
ER  - 

@article{
author = "Savić, Andrija B. and Čokeša, Đuro and Savić-Biserčić, Marjetka and Janković-Častvan, Ivona and Petrović, Rada and Živković, Ljiljana",
year = "2019",
abstract = "Natural filtration material tuff (T) was modified by coating with nano-sized magnetite. The grain fraction of 0.6–1.9 mm was submitted to hydrothermal synthesis of magnetite. Thus formed magnetite modified tuff (MMT) was characterized in terms of Fe-content, N2 adsorption- desorption isotherm, SEM, zeta potential-pH analyses and adsorption behavior towards phosphates/arsenates in batch and column conditions. Elemental analysis showed that 36.54 mg g−1 of magnetite was attached to the porous tuff grains. This modification changed pore structure and specific surface area. An increase of cca 35% in Sp value was obtained. Batch experiments proved that MMT was 4-5 times more efficient in removal of phosphates/arsenates than non-modified T. The maximum sorption capacities of phosphates calculated based on Langmuir equation were 0.45 and 1.91 mg g−1, while those for arsenate were 0.551 m g−1 and 2.36 mg g−1 for T and MMT, respectively. The intra-particle diffusion model was the most suited for describing the adsorption process of phosphate and arsenate onto MMT. Fixed-bed column data corroborated batch results, i.e. MMT was 6 times superior in contaminant adsorption than T. Modification with magnetite improved T potential for usage in water treatment applications: its filtration ability remained unchanged, while adsorption capacity for phosphates/arsenates removal was improved. © 2019 The Society of Powder Technology Japan",
journal = "Advanced Powder Technology",
title = "Multifunctional use of magnetite-coated tuff grains in water treatment: Removal of arsenates and phosphates",
volume = "30",
number = "8",
pages = "1687-1695",
doi = "10.1016/j.apt.2019.05.020"
}

Savić, A. B., Čokeša, Đ., Savić-Biserčić, M., Janković-Častvan, I., Petrović, R.,& Živković, L.. (2019). Multifunctional use of magnetite-coated tuff grains in water treatment: Removal of arsenates and phosphates. in Advanced Powder Technology, 30(8), 1687-1695.
https://doi.org/10.1016/j.apt.2019.05.020

Savić AB, Čokeša Đ, Savić-Biserčić M, Janković-Častvan I, Petrović R, Živković L. Multifunctional use of magnetite-coated tuff grains in water treatment: Removal of arsenates and phosphates. in Advanced Powder Technology. 2019;30(8):1687-1695.
doi:10.1016/j.apt.2019.05.020 .

Savić, Andrija B., Čokeša, Đuro, Savić-Biserčić, Marjetka, Janković-Častvan, Ivona, Petrović, Rada, Živković, Ljiljana, "Multifunctional use of magnetite-coated tuff grains in water treatment: Removal of arsenates and phosphates" in Advanced Powder Technology, 30, no. 8 (2019):1687-1695,
https://doi.org/10.1016/j.apt.2019.05.020 . .

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 . .

TY  - CONF
AU  - Maletić, Marina
AU  - Vukčević, Mira
AU  - Kalijadis, Ana
AU  - Janković-Častvan, Ivona
AU  - Dapčević, Aleksandra
AU  - Laušević, Zoran
AU  - Laušević, Mila
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9172
AB  - TiO2/carbon    composite    (TiO2/HTC),    synthesized    by    hydrothermal carbonization,  was  characterized  by  thermogravimetric  analysis,  nitrogen adsorption–desorption  isotherms  and  X-ray  diffraction.  The  possibility  of using   TiO2/HTC   as   photocatalysts   for   UV   and   visible   light   assisted degradation  of  methylene  blue  inaqueous  solution  was  examined.  It  was found  that  carbon  presence  in  TiO2/HTC  leads  to  the  higher  porosity  and increase in the share of photocatalytically active anatase phase. Compared to the   hydrothermally   synthesized   TiO2,   TiO2/HTC   showed   the   superior photocatalytic  activity  under  UV  irradiation.  In  addition,  TiO2/HTC  show high  recycling  ability  with  degradation  ratio  of  methylene  blue  higher  than 81%  after  five  cycles.  Also,  TiO2/HTC  is  expected  to  be  a  promising candidate for photocatalytic processes using visible light.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
T1  - One-step hydrothermal synthesis of photocatalytically active TiO2/carbon composite
SP  - C-12-P
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9172
ER  - 

@conference{
author = "Maletić, Marina and Vukčević, Mira and Kalijadis, Ana and Janković-Častvan, Ivona and Dapčević, Aleksandra and Laušević, Zoran and Laušević, Mila",
year = "2016",
abstract = "TiO2/carbon    composite    (TiO2/HTC),    synthesized    by    hydrothermal carbonization,  was  characterized  by  thermogravimetric  analysis,  nitrogen adsorption–desorption  isotherms  and  X-ray  diffraction.  The  possibility  of using   TiO2/HTC   as   photocatalysts   for   UV   and   visible   light   assisted degradation  of  methylene  blue  inaqueous  solution  was  examined.  It  was found  that  carbon  presence  in  TiO2/HTC  leads  to  the  higher  porosity  and increase in the share of photocatalytically active anatase phase. Compared to the   hydrothermally   synthesized   TiO2,   TiO2/HTC   showed   the   superior photocatalytic  activity  under  UV  irradiation.  In  addition,  TiO2/HTC  show high  recycling  ability  with  degradation  ratio  of  methylene  blue  higher  than 81%  after  five  cycles.  Also,  TiO2/HTC  is  expected  to  be  a  promising candidate for photocatalytic processes using visible light.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry",
title = "One-step hydrothermal synthesis of photocatalytically active TiO2/carbon composite",
pages = "C-12-P",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9172"
}

Maletić, M., Vukčević, M., Kalijadis, A., Janković-Častvan, I., Dapčević, A., Laušević, Z.,& Laušević, M.. (2016). One-step hydrothermal synthesis of photocatalytically active TiO2/carbon composite. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., C-12-P.
https://hdl.handle.net/21.15107/rcub_vinar_9172

Maletić M, Vukčević M, Kalijadis A, Janković-Častvan I, Dapčević A, Laušević Z, Laušević M. One-step hydrothermal synthesis of photocatalytically active TiO2/carbon composite. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry. 2016;:C-12-P.
https://hdl.handle.net/21.15107/rcub_vinar_9172 .

Maletić, Marina, Vukčević, Mira, Kalijadis, Ana, Janković-Častvan, Ivona, Dapčević, Aleksandra, Laušević, Zoran, Laušević, Mila, "One-step hydrothermal synthesis of photocatalytically active TiO2/carbon composite" in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry (2016):C-12-P,
https://hdl.handle.net/21.15107/rcub_vinar_9172 .

TY  - JOUR
AU  - Nikolić, Irena
AU  - Marković, Smilja
AU  - Janković-Častvan, Ivona
AU  - Radmilović, Vuk V.
AU  - Karanović, Ljiljana
AU  - Babić, Biljana M.
AU  - Radmilovíć, Velimir R.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1073
AB  - Geopolymeric binders (GB) were produced using fly ash (FA) and electric arc furnace slag (EAFS). The slag has been added in the range of 0-40%. The effects of slag content on the strength, microstructure and thermal resistance were evaluated. It was found that the amount of EAFS up to 30% positively affects the strength evolution of GB. The main reaction product of FA/EAFS blends was amorphous N-(C)-A-S-H gel along with geopolymer-type gel (N-A-S-H). Thermal resistance of GB was considered from the standpoint of their mechanical and dimensional stability after heating in the temperature interval of 600800 C. The changes in mechanical and thermal properties of GB after heating are attributed to the changes in their structure. The results have shown that EAFS negatively affects the thermal resistance of GB above 600 degrees C due to the phase transition and morphological transformation of the amorphous gel phase. (C) 2016 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Materials Letters
T1  - Modification of mechanical and thermal properties of fly ash-based geopolymer by the incorporation of steel slag
VL  - 176
SP  - 301
EP  - 305
DO  - 10.1016/j.matlet.2016.04.121
ER  - 

@article{
author = "Nikolić, Irena and Marković, Smilja and Janković-Častvan, Ivona and Radmilović, Vuk V. and Karanović, Ljiljana and Babić, Biljana M. and Radmilovíć, Velimir R.",
year = "2016",
abstract = "Geopolymeric binders (GB) were produced using fly ash (FA) and electric arc furnace slag (EAFS). The slag has been added in the range of 0-40%. The effects of slag content on the strength, microstructure and thermal resistance were evaluated. It was found that the amount of EAFS up to 30% positively affects the strength evolution of GB. The main reaction product of FA/EAFS blends was amorphous N-(C)-A-S-H gel along with geopolymer-type gel (N-A-S-H). Thermal resistance of GB was considered from the standpoint of their mechanical and dimensional stability after heating in the temperature interval of 600800 C. The changes in mechanical and thermal properties of GB after heating are attributed to the changes in their structure. The results have shown that EAFS negatively affects the thermal resistance of GB above 600 degrees C due to the phase transition and morphological transformation of the amorphous gel phase. (C) 2016 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Materials Letters",
title = "Modification of mechanical and thermal properties of fly ash-based geopolymer by the incorporation of steel slag",
volume = "176",
pages = "301-305",
doi = "10.1016/j.matlet.2016.04.121"
}

Nikolić, I., Marković, S., Janković-Častvan, I., Radmilović, V. V., Karanović, L., Babić, B. M.,& Radmilovíć, V. R.. (2016). Modification of mechanical and thermal properties of fly ash-based geopolymer by the incorporation of steel slag. in Materials Letters
Elsevier., 176, 301-305.
https://doi.org/10.1016/j.matlet.2016.04.121

Nikolić I, Marković S, Janković-Častvan I, Radmilović VV, Karanović L, Babić BM, Radmilovíć VR. Modification of mechanical and thermal properties of fly ash-based geopolymer by the incorporation of steel slag. in Materials Letters. 2016;176:301-305.
doi:10.1016/j.matlet.2016.04.121 .

Nikolić, Irena, Marković, Smilja, Janković-Častvan, Ivona, Radmilović, Vuk V., Karanović, Ljiljana, Babić, Biljana M., Radmilovíć, Velimir R., "Modification of mechanical and thermal properties of fly ash-based geopolymer by the incorporation of steel slag" in Materials Letters, 176 (2016):301-305,
https://doi.org/10.1016/j.matlet.2016.04.121 . .

TY  - CONF
AU  - Veljović, Đorđe N.
AU  - Jokić, Bojan M.
AU  - Janković-Častvan, Ivona
AU  - Smičiklas, Ivana D.
AU  - Petrovic, R.
AU  - Janaćković, Đorđe T.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6645
AB  - The influences of temperature and time on sintering behaviour of nanosized HAP powder were investigate in this paper. The calcium hydroxyapatite powder, with the average crystallite size of 34 +/- 1 nm, was uniaxially pressed at a pressure of 500 MPa. Obtained green compacts were sintered at temperature ranging from 1000 degrees C to 1200 degrees C in air atmosphere at various times. According to the results of scanning electron microscopy, X-ray and FTIR analyses, it is shown that HAP compacts with dense microstructure and average grain size below 250 nm is obtained.
C3  - Key Engineering Materials
T1  - Sintering behaviour of nanosized HAP powder
VL  - 330-332
SP  - 259
EP  - +
DO  - 10.4028/www.scientific.net/KEM.330-332.259
ER  - 

@conference{
author = "Veljović, Đorđe N. and Jokić, Bojan M. and Janković-Častvan, Ivona and Smičiklas, Ivana D. and Petrovic, R. and Janaćković, Đorđe T.",
year = "2007",
abstract = "The influences of temperature and time on sintering behaviour of nanosized HAP powder were investigate in this paper. The calcium hydroxyapatite powder, with the average crystallite size of 34 +/- 1 nm, was uniaxially pressed at a pressure of 500 MPa. Obtained green compacts were sintered at temperature ranging from 1000 degrees C to 1200 degrees C in air atmosphere at various times. According to the results of scanning electron microscopy, X-ray and FTIR analyses, it is shown that HAP compacts with dense microstructure and average grain size below 250 nm is obtained.",
journal = "Key Engineering Materials",
title = "Sintering behaviour of nanosized HAP powder",
volume = "330-332",
pages = "259-+",
doi = "10.4028/www.scientific.net/KEM.330-332.259"
}

Veljović, Đ. N., Jokić, B. M., Janković-Častvan, I., Smičiklas, I. D., Petrovic, R.,& Janaćković, Đ. T.. (2007). Sintering behaviour of nanosized HAP powder. in Key Engineering Materials, 330-332, 259-+.
https://doi.org/10.4028/www.scientific.net/KEM.330-332.259

Veljović ĐN, Jokić BM, Janković-Častvan I, Smičiklas ID, Petrovic R, Janaćković ĐT. Sintering behaviour of nanosized HAP powder. in Key Engineering Materials. 2007;330-332:259-+.
doi:10.4028/www.scientific.net/KEM.330-332.259 .

Veljović, Đorđe N., Jokić, Bojan M., Janković-Častvan, Ivona, Smičiklas, Ivana D., Petrovic, R., Janaćković, Đorđe T., "Sintering behaviour of nanosized HAP powder" in Key Engineering Materials, 330-332 (2007):259-+,
https://doi.org/10.4028/www.scientific.net/KEM.330-332.259 . .

TY  - JOUR
AU  - Jokić, Bojan M.
AU  - Janković-Častvan, Ivona
AU  - Veljović, Đorđe N.
AU  - Bučevac, Dušan
AU  - Obradović-Đuričić, K.
AU  - Petrović, R.
AU  - Janaćković, Đorđe T.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2574
AB  - The aim of this work is the investigation of alpha-tricalcium-phosphate (alpha-TCP) formation from calcium-deficient hydroxyapatite (CDHAP), synthesized by hydrothermal method from CaCl2, EDTA, NaH2PO4 center dot 2H(2)O and urea as precursors at 160 degrees C. Further, the influence of Ca/P ratios in the starting solution on alpha-TCP formation and the settings of obtained cements in simulated body fluid (SBF) were investigated. According to the results of X-ray, FTIR and SEM analyses, it is shown that CDHAP is transformed to beta-TCP at 800 degrees C, and to alpha-TCP at 1200 degrees C. Almost complete transformation of CDHAP into alpha-TCP occur after heating at 1500 degrees C in the case when Ca/P ratio in starting solution was 1,42. Cement powder mixed with the cement liquid (2.5 wt.% solution of Na2HPO4) completely hydrolyzes after 7 days in SBF, forming only CDHAP phase.
T2  - Journal of Optoelectronics and Advanced Materials
T1  - Synthesis and settings behavior of alpha-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method
VL  - 9
IS  - 6
SP  - 1904
EP  - 1910
UR  - https://hdl.handle.net/21.15107/rcub_vinar_2574
ER  - 

@article{
author = "Jokić, Bojan M. and Janković-Častvan, Ivona and Veljović, Đorđe N. and Bučevac, Dušan and Obradović-Đuričić, K. and Petrović, R. and Janaćković, Đorđe T.",
year = "2007",
abstract = "The aim of this work is the investigation of alpha-tricalcium-phosphate (alpha-TCP) formation from calcium-deficient hydroxyapatite (CDHAP), synthesized by hydrothermal method from CaCl2, EDTA, NaH2PO4 center dot 2H(2)O and urea as precursors at 160 degrees C. Further, the influence of Ca/P ratios in the starting solution on alpha-TCP formation and the settings of obtained cements in simulated body fluid (SBF) were investigated. According to the results of X-ray, FTIR and SEM analyses, it is shown that CDHAP is transformed to beta-TCP at 800 degrees C, and to alpha-TCP at 1200 degrees C. Almost complete transformation of CDHAP into alpha-TCP occur after heating at 1500 degrees C in the case when Ca/P ratio in starting solution was 1,42. Cement powder mixed with the cement liquid (2.5 wt.% solution of Na2HPO4) completely hydrolyzes after 7 days in SBF, forming only CDHAP phase.",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "Synthesis and settings behavior of alpha-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method",
volume = "9",
number = "6",
pages = "1904-1910",
url = "https://hdl.handle.net/21.15107/rcub_vinar_2574"
}

Jokić, B. M., Janković-Častvan, I., Veljović, Đ. N., Bučevac, D., Obradović-Đuričić, K., Petrović, R.,& Janaćković, Đ. T.. (2007). Synthesis and settings behavior of alpha-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method. in Journal of Optoelectronics and Advanced Materials, 9(6), 1904-1910.
https://hdl.handle.net/21.15107/rcub_vinar_2574

Jokić BM, Janković-Častvan I, Veljović ĐN, Bučevac D, Obradović-Đuričić K, Petrović R, Janaćković ĐT. Synthesis and settings behavior of alpha-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method. in Journal of Optoelectronics and Advanced Materials. 2007;9(6):1904-1910.
https://hdl.handle.net/21.15107/rcub_vinar_2574 .

Jokić, Bojan M., Janković-Častvan, Ivona, Veljović, Đorđe N., Bučevac, Dušan, Obradović-Đuričić, K., Petrović, R., Janaćković, Đorđe T., "Synthesis and settings behavior of alpha-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method" in Journal of Optoelectronics and Advanced Materials, 9, no. 6 (2007):1904-1910,
https://hdl.handle.net/21.15107/rcub_vinar_2574 .