TY  - JOUR
AU  - Gavrilov, Nemanja
AU  - Momcilovic, Milan
AU  - Dobrota, Ana S.
AU  - Stanković, Dalibor
AU  - Jokić, Bojan
AU  - Babić, Biljana
AU  - Skorodumova, Natalia V.
AU  - Mentus, Slavko V.
AU  - Pasti, Igor A.
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2088
AB  - The incorporation of trace amounts ( lt  0.2%) of Co and Ni noticeably enhanced the catalytic activity of nitrogen free ordered mesoporous carbon (OMC) towards oxygen reduction reaction (ORR). (Co,Ni)-doped OMCs were characterized by N-2-adsorption measurements, X-ray powder diffraction, field emission scanning electron microscopy and Raman spectroscopy methods, and their ORR activity was estimated by voltammetry on rotating disk electrode in acidic and alkaline media. (Co,Ni)-doped OMCs show modest activities in acidic media, while the catalytic activity in alkaline media is rather high. The measured activities are compared to the Pt-based and Pt-free ORR catalysts reported in the literature. The number of electrons consumed per O-2 in metal-doped OMCs was found to vary between 2 and 4, which is advantageous in comparison to metal-free OMC. Also, the mass activities of metal-doped OMCs were found to be up to 2.5 times higher compared to that of metal-free OMC. We suggest that the ORR activity is governed by a balance between (i) textural properties, which determine the electrochemically accessible surface of the catalyst and which are influenced by the addition of a metal precursor, and (ii) novel active sites formed upon the introduction of metals into the carbon structure. In particular, our Density Functional Theory calculations suggest that Co and Ni atoms embedded into the single vacancies of graphene can activate the O-2 molecule and contribute to the decomposition of peroxide.
PB  - Elsevier Science Sa, Lausanne
T2  - Surface and Coatings Technology
T1  - A study of ordered mesoporous carbon doped with Co and Ni as a catalyst of oxygen reduction reaction in both alkaline and acidic media
VL  - 349
SP  - 511
EP  - 521
DO  - 10.1016/j.surfcoat.2018.06.008
ER  - 

@article{
author = "Gavrilov, Nemanja and Momcilovic, Milan and Dobrota, Ana S. and Stanković, Dalibor and Jokić, Bojan and Babić, Biljana and Skorodumova, Natalia V. and Mentus, Slavko V. and Pasti, Igor A.",
year = "2018",
abstract = "The incorporation of trace amounts ( lt  0.2%) of Co and Ni noticeably enhanced the catalytic activity of nitrogen free ordered mesoporous carbon (OMC) towards oxygen reduction reaction (ORR). (Co,Ni)-doped OMCs were characterized by N-2-adsorption measurements, X-ray powder diffraction, field emission scanning electron microscopy and Raman spectroscopy methods, and their ORR activity was estimated by voltammetry on rotating disk electrode in acidic and alkaline media. (Co,Ni)-doped OMCs show modest activities in acidic media, while the catalytic activity in alkaline media is rather high. The measured activities are compared to the Pt-based and Pt-free ORR catalysts reported in the literature. The number of electrons consumed per O-2 in metal-doped OMCs was found to vary between 2 and 4, which is advantageous in comparison to metal-free OMC. Also, the mass activities of metal-doped OMCs were found to be up to 2.5 times higher compared to that of metal-free OMC. We suggest that the ORR activity is governed by a balance between (i) textural properties, which determine the electrochemically accessible surface of the catalyst and which are influenced by the addition of a metal precursor, and (ii) novel active sites formed upon the introduction of metals into the carbon structure. In particular, our Density Functional Theory calculations suggest that Co and Ni atoms embedded into the single vacancies of graphene can activate the O-2 molecule and contribute to the decomposition of peroxide.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Surface and Coatings Technology",
title = "A study of ordered mesoporous carbon doped with Co and Ni as a catalyst of oxygen reduction reaction in both alkaline and acidic media",
volume = "349",
pages = "511-521",
doi = "10.1016/j.surfcoat.2018.06.008"
}

Gavrilov, N., Momcilovic, M., Dobrota, A. S., Stanković, D., Jokić, B., Babić, B., Skorodumova, N. V., Mentus, S. V.,& Pasti, I. A.. (2018). A study of ordered mesoporous carbon doped with Co and Ni as a catalyst of oxygen reduction reaction in both alkaline and acidic media. in Surface and Coatings Technology
Elsevier Science Sa, Lausanne., 349, 511-521.
https://doi.org/10.1016/j.surfcoat.2018.06.008

Gavrilov N, Momcilovic M, Dobrota AS, Stanković D, Jokić B, Babić B, Skorodumova NV, Mentus SV, Pasti IA. A study of ordered mesoporous carbon doped with Co and Ni as a catalyst of oxygen reduction reaction in both alkaline and acidic media. in Surface and Coatings Technology. 2018;349:511-521.
doi:10.1016/j.surfcoat.2018.06.008 .

Gavrilov, Nemanja, Momcilovic, Milan, Dobrota, Ana S., Stanković, Dalibor, Jokić, Bojan, Babić, Biljana, Skorodumova, Natalia V., Mentus, Slavko V., Pasti, Igor A., "A study of ordered mesoporous carbon doped with Co and Ni as a catalyst of oxygen reduction reaction in both alkaline and acidic media" in Surface and Coatings Technology, 349 (2018):511-521,
https://doi.org/10.1016/j.surfcoat.2018.06.008 . .

TY  - DATA
AU  - Izrael-Živković, Lidija
AU  - Živković, Ljiljana S.
AU  - Beškoski, Vladimir
AU  - Gopčević, Kristina
AU  - Jokić, Bojan
AU  - Radosavljević, Dragoslav S.
AU  - Karadžić, Ivanka M.
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3649
T2  - Journal of Molecular Catalysis. B: Enzymatic
T1  - Supplementary data for the article: Izrael Živković, L. T.; Živković, L. S.; Beškoski, V. P.; Gopčević, K. R.; Jokić, B. M.; Radosavljević, D. S.; Karadžić, I. M. The Candida Rugosa Lipase Adsorbed onto Titania as Nano Biocatalyst with Improved Thermostability and Reuse Potential in Aqueous and Organic Media. Journal of Molecular Catalysis B: Enzymatic 2016, 133, S533–S542. https://doi.org/10.1016/j.molcatb.2017.06.001
UR  - https://hdl.handle.net/21.15107/rcub_cherry_3649
ER  - 

@misc{
author = "Izrael-Živković, Lidija and Živković, Ljiljana S. and Beškoski, Vladimir and Gopčević, Kristina and Jokić, Bojan and Radosavljević, Dragoslav S. and Karadžić, Ivanka M.",
year = "2016",
journal = "Journal of Molecular Catalysis. B: Enzymatic",
title = "Supplementary data for the article: Izrael Živković, L. T.; Živković, L. S.; Beškoski, V. P.; Gopčević, K. R.; Jokić, B. M.; Radosavljević, D. S.; Karadžić, I. M. The Candida Rugosa Lipase Adsorbed onto Titania as Nano Biocatalyst with Improved Thermostability and Reuse Potential in Aqueous and Organic Media. Journal of Molecular Catalysis B: Enzymatic 2016, 133, S533–S542. https://doi.org/10.1016/j.molcatb.2017.06.001",
url = "https://hdl.handle.net/21.15107/rcub_cherry_3649"
}

Izrael-Živković, L., Živković, L. S., Beškoski, V., Gopčević, K., Jokić, B., Radosavljević, D. S.,& Karadžić, I. M.. (2016). Supplementary data for the article: Izrael Živković, L. T.; Živković, L. S.; Beškoski, V. P.; Gopčević, K. R.; Jokić, B. M.; Radosavljević, D. S.; Karadžić, I. M. The Candida Rugosa Lipase Adsorbed onto Titania as Nano Biocatalyst with Improved Thermostability and Reuse Potential in Aqueous and Organic Media. Journal of Molecular Catalysis B: Enzymatic 2016, 133, S533–S542. https://doi.org/10.1016/j.molcatb.2017.06.001. in Journal of Molecular Catalysis. B: Enzymatic.
https://hdl.handle.net/21.15107/rcub_cherry_3649

Izrael-Živković L, Živković LS, Beškoski V, Gopčević K, Jokić B, Radosavljević DS, Karadžić IM. Supplementary data for the article: Izrael Živković, L. T.; Živković, L. S.; Beškoski, V. P.; Gopčević, K. R.; Jokić, B. M.; Radosavljević, D. S.; Karadžić, I. M. The Candida Rugosa Lipase Adsorbed onto Titania as Nano Biocatalyst with Improved Thermostability and Reuse Potential in Aqueous and Organic Media. Journal of Molecular Catalysis B: Enzymatic 2016, 133, S533–S542. https://doi.org/10.1016/j.molcatb.2017.06.001. in Journal of Molecular Catalysis. B: Enzymatic. 2016;.
https://hdl.handle.net/21.15107/rcub_cherry_3649 .

Izrael-Živković, Lidija, Živković, Ljiljana S., Beškoski, Vladimir, Gopčević, Kristina, Jokić, Bojan, Radosavljević, Dragoslav S., Karadžić, Ivanka M., "Supplementary data for the article: Izrael Živković, L. T.; Živković, L. S.; Beškoski, V. P.; Gopčević, K. R.; Jokić, B. M.; Radosavljević, D. S.; Karadžić, I. M. The Candida Rugosa Lipase Adsorbed onto Titania as Nano Biocatalyst with Improved Thermostability and Reuse Potential in Aqueous and Organic Media. Journal of Molecular Catalysis B: Enzymatic 2016, 133, S533–S542. https://doi.org/10.1016/j.molcatb.2017.06.001" in Journal of Molecular Catalysis. B: Enzymatic (2016),
https://hdl.handle.net/21.15107/rcub_cherry_3649 .

TY  - JOUR
AU  - Izrael-Živković, Lidija
AU  - Živković, Ljiljana S.
AU  - Beškoski, Vladimir
AU  - Gopčević, Kristina
AU  - Jokić, Bojan
AU  - Radosavljević, Dragoslav S.
AU  - Karadžić, Ivanka M.
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3648
AB  - The immobilization of Candida rugosa lipase by adsorption was performed onto commercial titania powder (Degussa P25). The change of titania particles surface was diagnosed by means of FTIR and FESEM analysis, as well as by shift of zeta potential value towards that of lipase. A detailed study of the effect of immobilization on enzyme kinetic, temperature stability, as well as on potential for its reuse in aqueous organic media was undertaken. Immobilization of lipase altered enzyme affinity toward substrates with different length of carbon chain in hydrolytic reaction. The Vmax value decreased 2–8-fold, where major constraint was registered for the ester containing the longest carbon chain. Thermostability of lipase improved more than 7-fold at 60 °C. Significant potential for reuse in water solutions was also found after immobilization. In cyclohexane immobilized lipase catalyzed synthesis of amyl octanoate by ping-pong bi–bi mechanism with inhibition by amyl alcohol. Obtained kinetic constants were Vmax = 26.4 μmol min−1, KAc = 0.52 mol/L, KAl = 0.2 mol/L and Ki,Al = 0.644 mol/L. Esterification activity remained 60% after 5 reuse cycles in cyclohexane indicating moderate reuse stability. © 2017 Elsevier B.V.
T2  - Journal of Molecular Catalysis. B: Enzymatic
T1  - The Candida rugosa lipase adsorbed onto titania as nano biocatalyst with improved thermostability and reuse potential in aqueous and organic media
VL  - 133
DO  - 10.1016/j.molcatb.2017.06.001
ER  - 

@article{
author = "Izrael-Živković, Lidija and Živković, Ljiljana S. and Beškoski, Vladimir and Gopčević, Kristina and Jokić, Bojan and Radosavljević, Dragoslav S. and Karadžić, Ivanka M.",
year = "2016",
abstract = "The immobilization of Candida rugosa lipase by adsorption was performed onto commercial titania powder (Degussa P25). The change of titania particles surface was diagnosed by means of FTIR and FESEM analysis, as well as by shift of zeta potential value towards that of lipase. A detailed study of the effect of immobilization on enzyme kinetic, temperature stability, as well as on potential for its reuse in aqueous organic media was undertaken. Immobilization of lipase altered enzyme affinity toward substrates with different length of carbon chain in hydrolytic reaction. The Vmax value decreased 2–8-fold, where major constraint was registered for the ester containing the longest carbon chain. Thermostability of lipase improved more than 7-fold at 60 °C. Significant potential for reuse in water solutions was also found after immobilization. In cyclohexane immobilized lipase catalyzed synthesis of amyl octanoate by ping-pong bi–bi mechanism with inhibition by amyl alcohol. Obtained kinetic constants were Vmax = 26.4 μmol min−1, KAc = 0.52 mol/L, KAl = 0.2 mol/L and Ki,Al = 0.644 mol/L. Esterification activity remained 60% after 5 reuse cycles in cyclohexane indicating moderate reuse stability. © 2017 Elsevier B.V.",
journal = "Journal of Molecular Catalysis. B: Enzymatic",
title = "The Candida rugosa lipase adsorbed onto titania as nano biocatalyst with improved thermostability and reuse potential in aqueous and organic media",
volume = "133",
doi = "10.1016/j.molcatb.2017.06.001"
}

Izrael-Živković, L., Živković, L. S., Beškoski, V., Gopčević, K., Jokić, B., Radosavljević, D. S.,& Karadžić, I. M.. (2016). The Candida rugosa lipase adsorbed onto titania as nano biocatalyst with improved thermostability and reuse potential in aqueous and organic media. in Journal of Molecular Catalysis. B: Enzymatic, 133.
https://doi.org/10.1016/j.molcatb.2017.06.001

Izrael-Živković L, Živković LS, Beškoski V, Gopčević K, Jokić B, Radosavljević DS, Karadžić IM. The Candida rugosa lipase adsorbed onto titania as nano biocatalyst with improved thermostability and reuse potential in aqueous and organic media. in Journal of Molecular Catalysis. B: Enzymatic. 2016;133.
doi:10.1016/j.molcatb.2017.06.001 .

Izrael-Živković, Lidija, Živković, Ljiljana S., Beškoski, Vladimir, Gopčević, Kristina, Jokić, Bojan, Radosavljević, Dragoslav S., Karadžić, Ivanka M., "The Candida rugosa lipase adsorbed onto titania as nano biocatalyst with improved thermostability and reuse potential in aqueous and organic media" in Journal of Molecular Catalysis. B: Enzymatic, 133 (2016),
https://doi.org/10.1016/j.molcatb.2017.06.001 . .

TY  - JOUR
AU  - Izrael-Živković, Lidija
AU  - Živković, Ljiljana S.
AU  - Beškoski, Vladimir
AU  - Gopčević, Kristina
AU  - Jokić, Bojan
AU  - Radosavljević, Dragoslav S.
AU  - Karadžić, Ivanka M.
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/315
AB  - The immobilization of Candida rugosa lipase by adsorption was performed onto commercial titania powder (Degussa P25). The change of titania particles surface was diagnosed by means of FTIR and FESEM analysis, as well as by shift of zeta potential value towards that of lipase. A detailed study of the effect of immobilization on enzyme kinetic, temperature stability, as well as on potential for its reuse in aqueous organic media was undertaken. Immobilization of lipase altered enzyme affinity toward substrates with different length of carbon chain in hydrolytic reaction. The Vmax value decreased 2–8-fold, where major constraint was registered for the ester containing the longest carbon chain. Thermostability of lipase improved more than 7-fold at 60 °C. Significant potential for reuse in water solutions was also found after immobilization. In cyclohexane immobilized lipase catalyzed synthesis of amyl octanoate by ping-pong bi–bi mechanism with inhibition by amyl alcohol. Obtained kinetic constants were Vmax = 26.4 μmol min−1, KAc = 0.52 mol/L, KAl = 0.2 mol/L and Ki,Al = 0.644 mol/L. Esterification activity remained 60% after 5 reuse cycles in cyclohexane indicating moderate reuse stability. © 2017 Elsevier B.V.
T2  - Journal of Molecular Catalysis. B: Enzymatic
T1  - The Candida rugosa lipase adsorbed onto titania as nano biocatalyst with improved thermostability and reuse potential in aqueous and organic media
VL  - 133
DO  - 10.1016/j.molcatb.2017.06.001
ER  - 

@article{
author = "Izrael-Živković, Lidija and Živković, Ljiljana S. and Beškoski, Vladimir and Gopčević, Kristina and Jokić, Bojan and Radosavljević, Dragoslav S. and Karadžić, Ivanka M.",
year = "2016",
abstract = "The immobilization of Candida rugosa lipase by adsorption was performed onto commercial titania powder (Degussa P25). The change of titania particles surface was diagnosed by means of FTIR and FESEM analysis, as well as by shift of zeta potential value towards that of lipase. A detailed study of the effect of immobilization on enzyme kinetic, temperature stability, as well as on potential for its reuse in aqueous organic media was undertaken. Immobilization of lipase altered enzyme affinity toward substrates with different length of carbon chain in hydrolytic reaction. The Vmax value decreased 2–8-fold, where major constraint was registered for the ester containing the longest carbon chain. Thermostability of lipase improved more than 7-fold at 60 °C. Significant potential for reuse in water solutions was also found after immobilization. In cyclohexane immobilized lipase catalyzed synthesis of amyl octanoate by ping-pong bi–bi mechanism with inhibition by amyl alcohol. Obtained kinetic constants were Vmax = 26.4 μmol min−1, KAc = 0.52 mol/L, KAl = 0.2 mol/L and Ki,Al = 0.644 mol/L. Esterification activity remained 60% after 5 reuse cycles in cyclohexane indicating moderate reuse stability. © 2017 Elsevier B.V.",
journal = "Journal of Molecular Catalysis. B: Enzymatic",
title = "The Candida rugosa lipase adsorbed onto titania as nano biocatalyst with improved thermostability and reuse potential in aqueous and organic media",
volume = "133",
doi = "10.1016/j.molcatb.2017.06.001"
}

Izrael-Živković, L., Živković, L. S., Beškoski, V., Gopčević, K., Jokić, B., Radosavljević, D. S.,& Karadžić, I. M.. (2016). The Candida rugosa lipase adsorbed onto titania as nano biocatalyst with improved thermostability and reuse potential in aqueous and organic media. in Journal of Molecular Catalysis. B: Enzymatic, 133.
https://doi.org/10.1016/j.molcatb.2017.06.001

Izrael-Živković L, Živković LS, Beškoski V, Gopčević K, Jokić B, Radosavljević DS, Karadžić IM. The Candida rugosa lipase adsorbed onto titania as nano biocatalyst with improved thermostability and reuse potential in aqueous and organic media. in Journal of Molecular Catalysis. B: Enzymatic. 2016;133.
doi:10.1016/j.molcatb.2017.06.001 .

Izrael-Živković, Lidija, Živković, Ljiljana S., Beškoski, Vladimir, Gopčević, Kristina, Jokić, Bojan, Radosavljević, Dragoslav S., Karadžić, Ivanka M., "The Candida rugosa lipase adsorbed onto titania as nano biocatalyst with improved thermostability and reuse potential in aqueous and organic media" in Journal of Molecular Catalysis. B: Enzymatic, 133 (2016),
https://doi.org/10.1016/j.molcatb.2017.06.001 . .