TY  - JOUR
AU  - Obradović, Maja D.
AU  - Lačnjevac, Uroš Č.
AU  - Radmilović, Vuk V.
AU  - Gavrilović-Wohlmuther, Aleksandra
AU  - Kovač, Janez
AU  - Rogan, Jelena R.
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6587
AB  - Two types of Cu-modified Pd catalysts supported on high area carbon were prepared: Pd nanoparticles modified with a sub-monolayer of underpotentially deposited Cu (Cu@Pd/C) and Pd-Cu alloy nanoparticles (Pd-Cu/C), and examined for the ethanol oxidation reaction (EOR) in alkaline solution. The catalysts were characterized by energy-dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy, as well as cyclic voltammetry. As reference catalysts, Pd/C and Pt/C were used. The electrochemically active surface area of all samples was determined from COads and Cuupd desorption and Pd oxide reduction, and used to assess their intrinsic activity for EOR. Intimate contact of Pd with Cu atoms enhanced its activity, regardless of the type of bimetal catalyst. The atomic Pd:Cu ratio between 2:1 and 4:1 appears to be optimal for high activity. The most active catalyst under the potentiodynamic conditions was Cu@Pd/C with θ(Cu) = 0.21,although Pd-Cu/C was superior during the potentiostatic test. All bimetallic catalysts surpassed Pd/C in mass activity. The EOR activity of Pt/C was higher compared to Pd-based catalysts at low potentials, both in terms of specific and mass activity, but with a significant decline over a 30-min potentiostatic stability test.
PB  - Elsevier B.V.
T2  - Journal of Electroanalytical Chemistry
T1  - Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium
SP  - 117673
VL  - 944
DO  - 10.1016/j.jelechem.2023.117673
ER  - 

@article{
author = "Obradović, Maja D. and Lačnjevac, Uroš Č. and Radmilović, Vuk V. and Gavrilović-Wohlmuther, Aleksandra and Kovač, Janez and Rogan, Jelena R. and Radmilović, Velimir R. and Gojković, Snežana Lj.",
year = "2023",
abstract = "Two types of Cu-modified Pd catalysts supported on high area carbon were prepared: Pd nanoparticles modified with a sub-monolayer of underpotentially deposited Cu (Cu@Pd/C) and Pd-Cu alloy nanoparticles (Pd-Cu/C), and examined for the ethanol oxidation reaction (EOR) in alkaline solution. The catalysts were characterized by energy-dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy, as well as cyclic voltammetry. As reference catalysts, Pd/C and Pt/C were used. The electrochemically active surface area of all samples was determined from COads and Cuupd desorption and Pd oxide reduction, and used to assess their intrinsic activity for EOR. Intimate contact of Pd with Cu atoms enhanced its activity, regardless of the type of bimetal catalyst. The atomic Pd:Cu ratio between 2:1 and 4:1 appears to be optimal for high activity. The most active catalyst under the potentiodynamic conditions was Cu@Pd/C with θ(Cu) = 0.21,although Pd-Cu/C was superior during the potentiostatic test. All bimetallic catalysts surpassed Pd/C in mass activity. The EOR activity of Pt/C was higher compared to Pd-based catalysts at low potentials, both in terms of specific and mass activity, but with a significant decline over a 30-min potentiostatic stability test.",
publisher = "Elsevier B.V.",
journal = "Journal of Electroanalytical Chemistry",
title = "Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium",
pages = "117673",
volume = "944",
doi = "10.1016/j.jelechem.2023.117673"
}

Obradović, M. D., Lačnjevac, U. Č., Radmilović, V. V., Gavrilović-Wohlmuther, A., Kovač, J., Rogan, J. R., Radmilović, V. R.,& Gojković, S. Lj.. (2023). Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium. in Journal of Electroanalytical Chemistry
Elsevier B.V.., 944, 117673.
https://doi.org/10.1016/j.jelechem.2023.117673

Obradović MD, Lačnjevac UČ, Radmilović VV, Gavrilović-Wohlmuther A, Kovač J, Rogan JR, Radmilović VR, Gojković SL. Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium. in Journal of Electroanalytical Chemistry. 2023;944:117673.
doi:10.1016/j.jelechem.2023.117673 .

Obradović, Maja D., Lačnjevac, Uroš Č., Radmilović, Vuk V., Gavrilović-Wohlmuther, Aleksandra, Kovač, Janez, Rogan, Jelena R., Radmilović, Velimir R., Gojković, Snežana Lj., "Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium" in Journal of Electroanalytical Chemistry, 944 (2023):117673,
https://doi.org/10.1016/j.jelechem.2023.117673 . .

TY  - CONF
AU  - Kalebić, Barbara
AU  - Škoro, Nikola
AU  - Kovač, Janez
AU  - Rajić, Nevenka
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6573
AB  - The use of antibiotics constantly increases which has a notable negative impact on water bodies. Ciprofloxacin (CIP) is widely applied
antibiotic in both human and veterinary medicine, as well as in a livestock breeding. Due to its extensive use, CIP has been found in
wastewater effluents in a wide concentration range from ng to mg dm^(–3). An extremely high concentration of up to 50 mg dm^(–3)
has been found near drug manufacturing plants [1]. Since CIP, as well as many other pharmaceuticals, cannot be efficiently removed
from wastewater streams by conventional wastewater treatments, it is of a great importance to find an acceptable method for their
removal.
This study reports the use of natural calcium-rich clinoptilolite (CLI) for the adsorption of CIP and regeneration of the spent adsorbent
(CLI-CIP) by non-thermal atmospheric pressure plasma (NTP). The results show that the CLI possesses a high adsorption efficiency in
removal of CIP at 283, 288 and 293 K in a slightly acidic medium (pH= 5) for the initial concentrations from 15 to 75 mg dm^(–3). The
CIP adsorption by CLI follows the Lagergren’s pseudo-second-order kinetics and it can be described well by the Langmuir isotherm
model. For all studied temperatures and initial concentrations more than 85% of the CIP is removed within the first 10 minutes. The
results also indicate that the CIP adsorption mechanism includes two phenomena: 1) electrostatic interactions between negatively
charged aluminosilicate lattice and cationic form of CIP species and 2) ion-exchange reaction.
The use of NTP for the regeneration of CLI-CIP was based on the assumption that NTP generates highly reactive species which can
induce a cleavage of the bonds formed between active sites on the CLI surface and CIP, and also induce the CIP decomposition. The
NTP treatment was performed for a short time, with a low energy consumption, and without using the additional chemicals. All these
make the procedure acceptable not only from economical point of view but also regarding environmental issues [2].
A surface dielectric barrier discharge plasma source was used for the treatment of CLI-CIP. The regeneration study was consisted of five
successive adsorption/NTP cycles. Powder X-ray diffraction and Brunauer–Emmett–Teller surface area analyses confirmed that the
plasma treatment did not influence the CLI lattice nor its textural properties. Moreover, X-ray photoelectron spectroscopy confirmed
that the NTP reduces carbon content in the regenerated CLI for more than 90% and that the plasma reactive species are involved in the
CLI regeneration process.
The obtained results strongly support the applicability of the NTP treatment in regeneration of zeolite-based adsorbents used in
pharmaceutical removal from wastewater.
PB  - Slovenian Zeoilte Association
C3  - Book of abstracts / 9th Conference of the Federation of European Zeolite Associations (FEZA
2023), 2nd-6th of July
T1  - ON THE ADSORPTION OF CIPROFLOXACIN BY CLINOPTILOLITE AND USE OF NON THERMAL ATMOSPHERIC PRESSURE PLASMA FOR REGENERATION OF THE SPENT ZEOLITE
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6573
ER  - 

@conference{
author = "Kalebić, Barbara and Škoro, Nikola and Kovač, Janez and Rajić, Nevenka",
year = "2023",
abstract = "The use of antibiotics constantly increases which has a notable negative impact on water bodies. Ciprofloxacin (CIP) is widely applied
antibiotic in both human and veterinary medicine, as well as in a livestock breeding. Due to its extensive use, CIP has been found in
wastewater effluents in a wide concentration range from ng to mg dm^(–3). An extremely high concentration of up to 50 mg dm^(–3)
has been found near drug manufacturing plants [1]. Since CIP, as well as many other pharmaceuticals, cannot be efficiently removed
from wastewater streams by conventional wastewater treatments, it is of a great importance to find an acceptable method for their
removal.
This study reports the use of natural calcium-rich clinoptilolite (CLI) for the adsorption of CIP and regeneration of the spent adsorbent
(CLI-CIP) by non-thermal atmospheric pressure plasma (NTP). The results show that the CLI possesses a high adsorption efficiency in
removal of CIP at 283, 288 and 293 K in a slightly acidic medium (pH= 5) for the initial concentrations from 15 to 75 mg dm^(–3). The
CIP adsorption by CLI follows the Lagergren’s pseudo-second-order kinetics and it can be described well by the Langmuir isotherm
model. For all studied temperatures and initial concentrations more than 85% of the CIP is removed within the first 10 minutes. The
results also indicate that the CIP adsorption mechanism includes two phenomena: 1) electrostatic interactions between negatively
charged aluminosilicate lattice and cationic form of CIP species and 2) ion-exchange reaction.
The use of NTP for the regeneration of CLI-CIP was based on the assumption that NTP generates highly reactive species which can
induce a cleavage of the bonds formed between active sites on the CLI surface and CIP, and also induce the CIP decomposition. The
NTP treatment was performed for a short time, with a low energy consumption, and without using the additional chemicals. All these
make the procedure acceptable not only from economical point of view but also regarding environmental issues [2].
A surface dielectric barrier discharge plasma source was used for the treatment of CLI-CIP. The regeneration study was consisted of five
successive adsorption/NTP cycles. Powder X-ray diffraction and Brunauer–Emmett–Teller surface area analyses confirmed that the
plasma treatment did not influence the CLI lattice nor its textural properties. Moreover, X-ray photoelectron spectroscopy confirmed
that the NTP reduces carbon content in the regenerated CLI for more than 90% and that the plasma reactive species are involved in the
CLI regeneration process.
The obtained results strongly support the applicability of the NTP treatment in regeneration of zeolite-based adsorbents used in
pharmaceutical removal from wastewater.",
publisher = "Slovenian Zeoilte Association",
journal = "Book of abstracts / 9th Conference of the Federation of European Zeolite Associations (FEZA
2023), 2nd-6th of July",
title = "ON THE ADSORPTION OF CIPROFLOXACIN BY CLINOPTILOLITE AND USE OF NON THERMAL ATMOSPHERIC PRESSURE PLASMA FOR REGENERATION OF THE SPENT ZEOLITE",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6573"
}

Kalebić, B., Škoro, N., Kovač, J.,& Rajić, N.. (2023). ON THE ADSORPTION OF CIPROFLOXACIN BY CLINOPTILOLITE AND USE OF NON THERMAL ATMOSPHERIC PRESSURE PLASMA FOR REGENERATION OF THE SPENT ZEOLITE. in Book of abstracts / 9th Conference of the Federation of European Zeolite Associations (FEZA
2023), 2nd-6th of July
Slovenian Zeoilte Association..
https://hdl.handle.net/21.15107/rcub_technorep_6573

Kalebić B, Škoro N, Kovač J, Rajić N. ON THE ADSORPTION OF CIPROFLOXACIN BY CLINOPTILOLITE AND USE OF NON THERMAL ATMOSPHERIC PRESSURE PLASMA FOR REGENERATION OF THE SPENT ZEOLITE. in Book of abstracts / 9th Conference of the Federation of European Zeolite Associations (FEZA
2023), 2nd-6th of July. 2023;.
https://hdl.handle.net/21.15107/rcub_technorep_6573 .

Kalebić, Barbara, Škoro, Nikola, Kovač, Janez, Rajić, Nevenka, "ON THE ADSORPTION OF CIPROFLOXACIN BY CLINOPTILOLITE AND USE OF NON THERMAL ATMOSPHERIC PRESSURE PLASMA FOR REGENERATION OF THE SPENT ZEOLITE" in Book of abstracts / 9th Conference of the Federation of European Zeolite Associations (FEZA
2023), 2nd-6th of July (2023),
https://hdl.handle.net/21.15107/rcub_technorep_6573 .

TY  - JOUR
AU  - Vasiljević, Zorka Ž.
AU  - Dojčinović, Milena P.
AU  - Vujančević, Jelena D.
AU  - Spreitzer, Matjaz
AU  - Kovač, Janez
AU  - Bartolić, Dragana
AU  - Marković, Smilja
AU  - Janković-Častvan, Ivona
AU  - Tadić, Nenad B.
AU  - Nikolić, Maria Vesna
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4845
AB  - Nanostructured Fe2TiO5 (pseudobrookite), a mixed metal oxide material holds significant promise for utilization in energy and environmental applications. However, its full application is still hindered due to the difficulty to synthesize monophasic Fe2TiO5 with high crystallinity and a large specific surface area. Herein, Fe2TiO5 nanofibers were synthesized via a versatile and low-cost electrospinning method, followed by a calcination process at different temperatures. We found a significant effect of the calcination process and its duration on the crystalline phase in the form of either pseudobrookite or pseudobrookite-hematite-rutile and the morphology of calcined nanofibers. The crystallite size increased whereas the specific surface area decreased with an increase in calcination temperature. At higher temperatures, the growth of Fe2TiO5 nanoparticles and simultaneous coalescence of small particles was noted. The highest specific surface area was obtained for the sample calcined at 500 degrees C for 6 h (S-BET = 64.4 m(2) g(-1)). This work opens new opportunities in the synthesis of Fe2TiO5 nanostructures using the electrospinning method and a subsequent optimized calcination process for energy-related applications.
PB  - Royal Society of Chemistry
T2  - RSC Advances
T1  - Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe2TiO5 nanofibers
EP  - 32368
IS  - 51
SP  - 32358
VL  - 11
DO  - 10.1039/d1ra05748k
ER  - 

@article{
author = "Vasiljević, Zorka Ž. and Dojčinović, Milena P. and Vujančević, Jelena D. and Spreitzer, Matjaz and Kovač, Janez and Bartolić, Dragana and Marković, Smilja and Janković-Častvan, Ivona and Tadić, Nenad B. and Nikolić, Maria Vesna",
year = "2021",
abstract = "Nanostructured Fe2TiO5 (pseudobrookite), a mixed metal oxide material holds significant promise for utilization in energy and environmental applications. However, its full application is still hindered due to the difficulty to synthesize monophasic Fe2TiO5 with high crystallinity and a large specific surface area. Herein, Fe2TiO5 nanofibers were synthesized via a versatile and low-cost electrospinning method, followed by a calcination process at different temperatures. We found a significant effect of the calcination process and its duration on the crystalline phase in the form of either pseudobrookite or pseudobrookite-hematite-rutile and the morphology of calcined nanofibers. The crystallite size increased whereas the specific surface area decreased with an increase in calcination temperature. At higher temperatures, the growth of Fe2TiO5 nanoparticles and simultaneous coalescence of small particles was noted. The highest specific surface area was obtained for the sample calcined at 500 degrees C for 6 h (S-BET = 64.4 m(2) g(-1)). This work opens new opportunities in the synthesis of Fe2TiO5 nanostructures using the electrospinning method and a subsequent optimized calcination process for energy-related applications.",
publisher = "Royal Society of Chemistry",
journal = "RSC Advances",
title = "Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe2TiO5 nanofibers",
pages = "32368-32358",
number = "51",
volume = "11",
doi = "10.1039/d1ra05748k"
}

Vasiljević, Z. Ž., Dojčinović, M. P., Vujančević, J. D., Spreitzer, M., Kovač, J., Bartolić, D., Marković, S., Janković-Častvan, I., Tadić, N. B.,& Nikolić, M. V.. (2021). Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe2TiO5 nanofibers. in RSC Advances
Royal Society of Chemistry., 11(51), 32358-32368.
https://doi.org/10.1039/d1ra05748k

Vasiljević ZŽ, Dojčinović MP, Vujančević JD, Spreitzer M, Kovač J, Bartolić D, Marković S, Janković-Častvan I, Tadić NB, Nikolić MV. Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe2TiO5 nanofibers. in RSC Advances. 2021;11(51):32358-32368.
doi:10.1039/d1ra05748k .

Vasiljević, Zorka Ž., Dojčinović, Milena P., Vujančević, Jelena D., Spreitzer, Matjaz, Kovač, Janez, Bartolić, Dragana, Marković, Smilja, Janković-Častvan, Ivona, Tadić, Nenad B., Nikolić, Maria Vesna, "Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe2TiO5 nanofibers" in RSC Advances, 11, no. 51 (2021):32358-32368,
https://doi.org/10.1039/d1ra05748k . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Ercius, P.
AU  - Kovac, Janez
AU  - Radmilović, Velimir R
AU  - Babić, Biljana M.
AU  - Krstajić, Nedeljko V
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5799
AB  - Ruthenium oxide/titanium oxide, with a Ru:Ti atomic ratio of 7:3 was synthesized by modified sol-gel procedure and used as a support for platinum nanocatalyst for oxygen reduction reaction. The synthesized materials were characterized in terms of morphology, particle size distribution, chemical and phase composition by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high angle annular dark filed scanning transmission electron microscopy (HAADF, STEM) and electron energy loss spectroscopy (EELS). XPS spectra revealed that Ru atoms were in mainly in Ru(4+) oxidation state, the Ti atoms in Ti(4+) oxidation state, whereas the Pt-atoms were in metallic state. TEM analysis proved that platinum nanoparticles nucleated at both oxide species and homogeneous distribution was observed. The average platinum nanoparticle size was 3.05 nm. Electrochemically active surface area of platinum was 32 m(2) g(-1). Kinetics of the oxygen reduction was studied at rotating disc electrode in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The catalytic activities expressed in terms of specific activity (per electrochemically active surface area of platinum) and mass activity (per mass of platinum) were determined and compared to Pt catalyst on carbon support. The high catalytic activity was proven by electrochemical characterization.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - Synthesis and characterization of Pt nanocatalyst on Ru0.7Ti0.3O2 support as a cathode for fuel cells application
EP  - 171
SP  - 164
VL  - 739
DO  - 10.1016/j.jelechem.2014.12.033
ER  - 

@article{
author = "Elezović, Nevenka R. and Ercius, P. and Kovac, Janez and Radmilović, Velimir R and Babić, Biljana M. and Krstajić, Nedeljko V",
year = "2015",
abstract = "Ruthenium oxide/titanium oxide, with a Ru:Ti atomic ratio of 7:3 was synthesized by modified sol-gel procedure and used as a support for platinum nanocatalyst for oxygen reduction reaction. The synthesized materials were characterized in terms of morphology, particle size distribution, chemical and phase composition by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high angle annular dark filed scanning transmission electron microscopy (HAADF, STEM) and electron energy loss spectroscopy (EELS). XPS spectra revealed that Ru atoms were in mainly in Ru(4+) oxidation state, the Ti atoms in Ti(4+) oxidation state, whereas the Pt-atoms were in metallic state. TEM analysis proved that platinum nanoparticles nucleated at both oxide species and homogeneous distribution was observed. The average platinum nanoparticle size was 3.05 nm. Electrochemically active surface area of platinum was 32 m(2) g(-1). Kinetics of the oxygen reduction was studied at rotating disc electrode in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The catalytic activities expressed in terms of specific activity (per electrochemically active surface area of platinum) and mass activity (per mass of platinum) were determined and compared to Pt catalyst on carbon support. The high catalytic activity was proven by electrochemical characterization.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Synthesis and characterization of Pt nanocatalyst on Ru0.7Ti0.3O2 support as a cathode for fuel cells application",
pages = "171-164",
volume = "739",
doi = "10.1016/j.jelechem.2014.12.033"
}

Elezović, N. R., Ercius, P., Kovac, J., Radmilović, V. R., Babić, B. M.,& Krstajić, N. V.. (2015). Synthesis and characterization of Pt nanocatalyst on Ru0.7Ti0.3O2 support as a cathode for fuel cells application. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 739, 164-171.
https://doi.org/10.1016/j.jelechem.2014.12.033

Elezović NR, Ercius P, Kovac J, Radmilović VR, Babić BM, Krstajić NV. Synthesis and characterization of Pt nanocatalyst on Ru0.7Ti0.3O2 support as a cathode for fuel cells application. in Journal of Electroanalytical Chemistry. 2015;739:164-171.
doi:10.1016/j.jelechem.2014.12.033 .

Elezović, Nevenka R., Ercius, P., Kovac, Janez, Radmilović, Velimir R, Babić, Biljana M., Krstajić, Nedeljko V, "Synthesis and characterization of Pt nanocatalyst on Ru0.7Ti0.3O2 support as a cathode for fuel cells application" in Journal of Electroanalytical Chemistry, 739 (2015):164-171,
https://doi.org/10.1016/j.jelechem.2014.12.033 . .