Milojković, Natalija

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orcid::0000-0002-6112-6219
  • Milojković, Natalija (2)
  • Milojković, Natalija D. (1)
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Author's Bibliography

Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light

Milojković, Natalija; Simović, Bojana; Žunić, Milan; Radovanović, Lidija; Dapčević, Aleksandra

(Novi Sad : Faculty of Technology, 2023)

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Radovanović, Lidija
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7402
AB  - It is well known that titanium dioxide is usually used as a photocatalyst due to its nontoxicity, low cost, and stability. Conductive polymer, polypyrrole (PPy) is also appropriate for photocatalytic application being stable and easy to synthesize. The aim of this study was to obtain TiO2/PPy composites reaching higher photocatalytic efficiency compared to pure TiO2. Therefore, TiO2 was synthesized by the hydrothermal route, while PPy was obtained by the chemical oxidative polymerization method. TiO2/x% PPy nanocomposites (x = 0, 0.5, 1, 1.5, 3, 5 wt.%) were prepared by hand-mixing of powders in agate mortar for 30 min in order to find the optimal PPy content. Obtained materials were characterized by XRD, FTIR, TG/DSC, FESEM, and UV-Vis methods while their photocatalytic activity was estimated towards degradation of Reactive Orange 16 dye (RO16). A kinetic study was performed and a detailed mechanism of RO16 photocatalytic degradation in the presence of TiO2/PPy composites was proposed based on scavenger tests. The results showed that, despite PPy addition, TiO2 was present in anatase form in all samples with sufficiently small crystallites (around 26 nm) and preserved structure with no significant deviations in unit cell parameters. The band gap energy decreased with increasing of PPy content, from 3.14 eV for pure TiO2 to 2.94 eV for TiO2/5% PPy. All the obtained nanocomposites demonstrated higher photocatalytic activity than pure TiO2, whereby TiO2/1% PPy nanocomposite was the most efficient by degrading 99.6% of the dye for 105 min under simulated solar light. Therefore, the amount of 1 wt.% should be consider as optimal amount of PPy in a composite. It is established that the photodegradation of RO16 using TiO2/PPy nanocomposites follows pseudo-first kinetic order. RO16 photocatalytic degradation mechanism in the presence of TiO2/PPy nanocomposites can be well described by direct Z-scheme heterojunction which has never been reported for TiO2/PPy system.
PB  - Novi Sad : Faculty of Technology
C3  - Programme and book of abstracts / 15th ECerS Conference for Young Scientists in Ceramics, October 11-14, 2023, Novi Sad, Serbia
T1  - Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light
SP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7402
ER  - 
@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Radovanović, Lidija and Dapčević, Aleksandra",
year = "2023",
abstract = "It is well known that titanium dioxide is usually used as a photocatalyst due to its nontoxicity, low cost, and stability. Conductive polymer, polypyrrole (PPy) is also appropriate for photocatalytic application being stable and easy to synthesize. The aim of this study was to obtain TiO2/PPy composites reaching higher photocatalytic efficiency compared to pure TiO2. Therefore, TiO2 was synthesized by the hydrothermal route, while PPy was obtained by the chemical oxidative polymerization method. TiO2/x% PPy nanocomposites (x = 0, 0.5, 1, 1.5, 3, 5 wt.%) were prepared by hand-mixing of powders in agate mortar for 30 min in order to find the optimal PPy content. Obtained materials were characterized by XRD, FTIR, TG/DSC, FESEM, and UV-Vis methods while their photocatalytic activity was estimated towards degradation of Reactive Orange 16 dye (RO16). A kinetic study was performed and a detailed mechanism of RO16 photocatalytic degradation in the presence of TiO2/PPy composites was proposed based on scavenger tests. The results showed that, despite PPy addition, TiO2 was present in anatase form in all samples with sufficiently small crystallites (around 26 nm) and preserved structure with no significant deviations in unit cell parameters. The band gap energy decreased with increasing of PPy content, from 3.14 eV for pure TiO2 to 2.94 eV for TiO2/5% PPy. All the obtained nanocomposites demonstrated higher photocatalytic activity than pure TiO2, whereby TiO2/1% PPy nanocomposite was the most efficient by degrading 99.6% of the dye for 105 min under simulated solar light. Therefore, the amount of 1 wt.% should be consider as optimal amount of PPy in a composite. It is established that the photodegradation of RO16 using TiO2/PPy nanocomposites follows pseudo-first kinetic order. RO16 photocatalytic degradation mechanism in the presence of TiO2/PPy nanocomposites can be well described by direct Z-scheme heterojunction which has never been reported for TiO2/PPy system.",
publisher = "Novi Sad : Faculty of Technology",
journal = "Programme and book of abstracts / 15th ECerS Conference for Young Scientists in Ceramics, October 11-14, 2023, Novi Sad, Serbia",
title = "Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light",
pages = "87",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7402"
}
Milojković, N., Simović, B., Žunić, M., Radovanović, L.,& Dapčević, A.. (2023). Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light. in Programme and book of abstracts / 15th ECerS Conference for Young Scientists in Ceramics, October 11-14, 2023, Novi Sad, Serbia
Novi Sad : Faculty of Technology., 87.
https://hdl.handle.net/21.15107/rcub_technorep_7402
Milojković N, Simović B, Žunić M, Radovanović L, Dapčević A. Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light. in Programme and book of abstracts / 15th ECerS Conference for Young Scientists in Ceramics, October 11-14, 2023, Novi Sad, Serbia. 2023;:87.
https://hdl.handle.net/21.15107/rcub_technorep_7402 .
Milojković, Natalija, Simović, Bojana, Žunić, Milan, Radovanović, Lidija, Dapčević, Aleksandra, "Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light" in Programme and book of abstracts / 15th ECerS Conference for Young Scientists in Ceramics, October 11-14, 2023, Novi Sad, Serbia (2023):87,
https://hdl.handle.net/21.15107/rcub_technorep_7402 .

Nanokompoziti TiO2/PPy za primenu u fotokatalizi

Milojković, Natalija D.; Simović, Bojana M.; Žunić, Milan M.; Radovanović, Lidija D.; Dapčević, Aleksandra H.

(Beograd : Srpsko hemijsko društvo = Serbian Chemical Society, 2023)

TY  - CONF
AU  - Milojković, Natalija D.
AU  - Simović, Bojana M.
AU  - Žunić, Milan M.
AU  - Radovanović, Lidija D.
AU  - Dapčević, Aleksandra H.
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7403
AB  - Titan(IV)-oksid je jedan od najčešće korišćenih fotokatalizatora, dok za polipirol (PPy) postoje potvrde da je pogodan za ovu primenu. Cilj ovog rada bio je dobijanje kompozita TiO2/PPy sa boljom fotokatalitičkom aktivnosti u odnosu na TiO2. Kako bi se optimizovao sadržaj PPy u kompozitu, sintetisani su uzorci TiO2/x%PPy (x = 0, 0,5, 1, 1,5, 3, 5 mas.%), koji su okarakterisani TG/DTA, XRD, FTIR, FESEM i UV-Vis metodama, dok su njihova fotokatalitička svojstva ispitana kroz razgradnju tekstilne boje RO16. Nanokristalni TiO2 je dobijen u obliku anatasa veličine kristalita oko 2 nm, dok su izračunati parametri jedinične ćelije potvrdili da je kristalna struktura anatasa ostala nepromenjena nakon dodatka PPy. Gotovo svi uzorci (izuzev TiO2/3%PPy) su fotokatalitički aktivniji od TiO2, dok je TiO2/1%PPy pokazao najizraženiju fotokatalitičku aktivnost razgradivši 9 % boje nakon 75 min.
AB  - Titanium(IV) oxide is one of the most used photocatalysts while polypyrrole (PPy) is a promising material for photocatalytic application. The aim of this work was to obtain TiO2/PPy composites exhibiting higher photocatalytic activity than TiO2. In order to determine the optimal PPy content in a composite, TiO2/x%PPy (x = 0, 0.5, 1, 1.5, 3, 5 wt.%) samples were synthesized and characterized by TG/DTA, XRD, FTIR, FESEM and UV-Vis methods, while the photocatalytic behavior was examined towards the degradation of the textile dye RO16. Nanocrystalline TiO2 was obtained in anatase form with crystallite size around 26 nm and preserved anatase crystal structure despite the addition of PPy according to the calculated unit cell parameters. Almost all samples (except TiO2/3%PPy) showed better photocatalytic activity than TiO2 while the best photocatalytic activity was demonstrated by TiO2/1%PPy which degraded 98 % of the dye after 75 min.
PB  - Beograd : Srpsko hemijsko društvo = Serbian Chemical Society
C3  - Kratki izvodi radova ; Knjiga radova = Book of Abstracts ; Proceedings / 59. savetovanje Srpskog hemijskog društva, Novi Sad 1. i 2. jun 2023. godine = 59th meeting of the Serbian Chemical Society, Novi Sad, Serbia, June 1-2, 2023
T1  - Nanokompoziti TiO2/PPy za primenu u fotokatalizi
T1  - TiO2/PPy nanocomposites for photocatalytic application
SP  - 144
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7403
ER  - 
@conference{
author = "Milojković, Natalija D. and Simović, Bojana M. and Žunić, Milan M. and Radovanović, Lidija D. and Dapčević, Aleksandra H.",
year = "2023",
abstract = "Titan(IV)-oksid je jedan od najčešće korišćenih fotokatalizatora, dok za polipirol (PPy) postoje potvrde da je pogodan za ovu primenu. Cilj ovog rada bio je dobijanje kompozita TiO2/PPy sa boljom fotokatalitičkom aktivnosti u odnosu na TiO2. Kako bi se optimizovao sadržaj PPy u kompozitu, sintetisani su uzorci TiO2/x%PPy (x = 0, 0,5, 1, 1,5, 3, 5 mas.%), koji su okarakterisani TG/DTA, XRD, FTIR, FESEM i UV-Vis metodama, dok su njihova fotokatalitička svojstva ispitana kroz razgradnju tekstilne boje RO16. Nanokristalni TiO2 je dobijen u obliku anatasa veličine kristalita oko 2 nm, dok su izračunati parametri jedinične ćelije potvrdili da je kristalna struktura anatasa ostala nepromenjena nakon dodatka PPy. Gotovo svi uzorci (izuzev TiO2/3%PPy) su fotokatalitički aktivniji od TiO2, dok je TiO2/1%PPy pokazao najizraženiju fotokatalitičku aktivnost razgradivši 9 % boje nakon 75 min., Titanium(IV) oxide is one of the most used photocatalysts while polypyrrole (PPy) is a promising material for photocatalytic application. The aim of this work was to obtain TiO2/PPy composites exhibiting higher photocatalytic activity than TiO2. In order to determine the optimal PPy content in a composite, TiO2/x%PPy (x = 0, 0.5, 1, 1.5, 3, 5 wt.%) samples were synthesized and characterized by TG/DTA, XRD, FTIR, FESEM and UV-Vis methods, while the photocatalytic behavior was examined towards the degradation of the textile dye RO16. Nanocrystalline TiO2 was obtained in anatase form with crystallite size around 26 nm and preserved anatase crystal structure despite the addition of PPy according to the calculated unit cell parameters. Almost all samples (except TiO2/3%PPy) showed better photocatalytic activity than TiO2 while the best photocatalytic activity was demonstrated by TiO2/1%PPy which degraded 98 % of the dye after 75 min.",
publisher = "Beograd : Srpsko hemijsko društvo = Serbian Chemical Society",
journal = "Kratki izvodi radova ; Knjiga radova = Book of Abstracts ; Proceedings / 59. savetovanje Srpskog hemijskog društva, Novi Sad 1. i 2. jun 2023. godine = 59th meeting of the Serbian Chemical Society, Novi Sad, Serbia, June 1-2, 2023",
title = "Nanokompoziti TiO2/PPy za primenu u fotokatalizi, TiO2/PPy nanocomposites for photocatalytic application",
pages = "144",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7403"
}
Milojković, N. D., Simović, B. M., Žunić, M. M., Radovanović, L. D.,& Dapčević, A. H.. (2023). Nanokompoziti TiO2/PPy za primenu u fotokatalizi. in Kratki izvodi radova ; Knjiga radova = Book of Abstracts ; Proceedings / 59. savetovanje Srpskog hemijskog društva, Novi Sad 1. i 2. jun 2023. godine = 59th meeting of the Serbian Chemical Society, Novi Sad, Serbia, June 1-2, 2023
Beograd : Srpsko hemijsko društvo = Serbian Chemical Society., 144.
https://hdl.handle.net/21.15107/rcub_technorep_7403
Milojković ND, Simović BM, Žunić MM, Radovanović LD, Dapčević AH. Nanokompoziti TiO2/PPy za primenu u fotokatalizi. in Kratki izvodi radova ; Knjiga radova = Book of Abstracts ; Proceedings / 59. savetovanje Srpskog hemijskog društva, Novi Sad 1. i 2. jun 2023. godine = 59th meeting of the Serbian Chemical Society, Novi Sad, Serbia, June 1-2, 2023. 2023;:144.
https://hdl.handle.net/21.15107/rcub_technorep_7403 .
Milojković, Natalija D., Simović, Bojana M., Žunić, Milan M., Radovanović, Lidija D., Dapčević, Aleksandra H., "Nanokompoziti TiO2/PPy za primenu u fotokatalizi" in Kratki izvodi radova ; Knjiga radova = Book of Abstracts ; Proceedings / 59. savetovanje Srpskog hemijskog društva, Novi Sad 1. i 2. jun 2023. godine = 59th meeting of the Serbian Chemical Society, Novi Sad, Serbia, June 1-2, 2023 (2023):144,
https://hdl.handle.net/21.15107/rcub_technorep_7403 .

A novel disinfectant based on zinc orthotitanate

Milojković, Natalija; Orlić, Marina; Dikić, Jelena; Zunic, Milan; Simović, Bojana; Dapčević, Aleksandra

(European Powder Diffraction Conference (17 ; 2022 ; Šibenik), 2022)

TY  - CONF
AU  - Milojković, Natalija
AU  - Orlić, Marina
AU  - Dikić, Jelena
AU  - Zunic, Milan
AU  - Simović, Bojana
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6478
AB  - Regarding enormous expansion of bacterial contamination as well as their increase resistivity to commonly used disinfectants, there is a great demand for antibacterial material, which will not be based on organic compounds. Among various inorganic substances, environmentally friendly, low-cost and chemically stable ZnO and TiO2 demonstrate considerable antibacterial activity.This work primarily focuses on idea of developing novel disinfectant based on both, ZnO and TiO2, which would integrate all the worthy properties of both oxides. For that matter, titanium(IV) butoxide was dissolved in a solution of zinc acetate following with the ammonia addition until pH value was 8.5. Half of the initial solution was hydrothermally treated, dried and calcined at 500 (H-ZnTi-500) and 800°C (H-ZnTi-800). Two other samples (ZnTi-500 and ZnTi-800) were obtained from the other half of the initial solution which was directly dried and calcined under the same conditions. The samples were characterized by XRD including Rietveld refinement, FESEMand TG/DTA. Antibacterial activity was examined towards Gram-positive S. aureus and Gram-negative E. coli .The results showed that only ZnTi-800 consisted of pure Zn2TiO4 (Fd-3m) while Zn TiO was the major phase in three other samples. In the case of samples calcined at 500 °C, traces of ZnO were found. H-ZnTi-800 contained three phases: Zn2TiO4, ZnO and Zn2Ti3O8 (P4332). Cubic Zn2TiO4 contains two cation sites: tetrahedrally coordinated Zn at 0,0,0 and octahedral site at 5/8,5/8,5/8 shared between Zn and Ti. The calculated a-parameters of all obtained Zn2TiO4 as well as Zn–O and Zn/Ti–O bond distances were independent of synthesis. At 500 °C nanocrystalline Zn2TiO4 were obtained with the crystallite sizes 26 and 71 nm for H-ZnTi-500 and ZnTi-500, respectively, while microcrystalline phases were obtained at 800 °C with the crystallite sizes larger than 110 nm. The soft agglomerates consisted of smaller particles were obtained at 500 °C comparing to samples at 800 °C having more compact agglomerates.The best antibacterial activity with high reduction in the number of bacteria cells (87.6 % of E. coli and 63.4 % of S. aureus) was exhibited by the ZnTi-500. It means that the purity of samples, crystallite size and softness of agglomerates, influence antibacterial activity and that optimal level of all factors should be reached since ZnTi-500 was almost pure with sufficiently small crystallites and soft agglomerates.
PB  - European Powder Diffraction Conference (17 ; 2022 ; Šibenik)
C3  - European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts
T1  - A novel disinfectant based on zinc orthotitanate
SP  - 206
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1969
ER  - 
@conference{
author = "Milojković, Natalija and Orlić, Marina and Dikić, Jelena and Zunic, Milan and Simović, Bojana and Dapčević, Aleksandra",
year = "2022",
abstract = "Regarding enormous expansion of bacterial contamination as well as their increase resistivity to commonly used disinfectants, there is a great demand for antibacterial material, which will not be based on organic compounds. Among various inorganic substances, environmentally friendly, low-cost and chemically stable ZnO and TiO2 demonstrate considerable antibacterial activity.This work primarily focuses on idea of developing novel disinfectant based on both, ZnO and TiO2, which would integrate all the worthy properties of both oxides. For that matter, titanium(IV) butoxide was dissolved in a solution of zinc acetate following with the ammonia addition until pH value was 8.5. Half of the initial solution was hydrothermally treated, dried and calcined at 500 (H-ZnTi-500) and 800°C (H-ZnTi-800). Two other samples (ZnTi-500 and ZnTi-800) were obtained from the other half of the initial solution which was directly dried and calcined under the same conditions. The samples were characterized by XRD including Rietveld refinement, FESEMand TG/DTA. Antibacterial activity was examined towards Gram-positive S. aureus and Gram-negative E. coli .The results showed that only ZnTi-800 consisted of pure Zn2TiO4 (Fd-3m) while Zn TiO was the major phase in three other samples. In the case of samples calcined at 500 °C, traces of ZnO were found. H-ZnTi-800 contained three phases: Zn2TiO4, ZnO and Zn2Ti3O8 (P4332). Cubic Zn2TiO4 contains two cation sites: tetrahedrally coordinated Zn at 0,0,0 and octahedral site at 5/8,5/8,5/8 shared between Zn and Ti. The calculated a-parameters of all obtained Zn2TiO4 as well as Zn–O and Zn/Ti–O bond distances were independent of synthesis. At 500 °C nanocrystalline Zn2TiO4 were obtained with the crystallite sizes 26 and 71 nm for H-ZnTi-500 and ZnTi-500, respectively, while microcrystalline phases were obtained at 800 °C with the crystallite sizes larger than 110 nm. The soft agglomerates consisted of smaller particles were obtained at 500 °C comparing to samples at 800 °C having more compact agglomerates.The best antibacterial activity with high reduction in the number of bacteria cells (87.6 % of E. coli and 63.4 % of S. aureus) was exhibited by the ZnTi-500. It means that the purity of samples, crystallite size and softness of agglomerates, influence antibacterial activity and that optimal level of all factors should be reached since ZnTi-500 was almost pure with sufficiently small crystallites and soft agglomerates.",
publisher = "European Powder Diffraction Conference (17 ; 2022 ; Šibenik)",
journal = "European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts",
title = "A novel disinfectant based on zinc orthotitanate",
pages = "206",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1969"
}
Milojković, N., Orlić, M., Dikić, J., Zunic, M., Simović, B.,& Dapčević, A.. (2022). A novel disinfectant based on zinc orthotitanate. in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts
European Powder Diffraction Conference (17 ; 2022 ; Šibenik)., 206.
https://hdl.handle.net/21.15107/rcub_rimsi_1969
Milojković N, Orlić M, Dikić J, Zunic M, Simović B, Dapčević A. A novel disinfectant based on zinc orthotitanate. in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts. 2022;:206.
https://hdl.handle.net/21.15107/rcub_rimsi_1969 .
Milojković, Natalija, Orlić, Marina, Dikić, Jelena, Zunic, Milan, Simović, Bojana, Dapčević, Aleksandra, "A novel disinfectant based on zinc orthotitanate" in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts (2022):206,
https://hdl.handle.net/21.15107/rcub_rimsi_1969 .