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Effect of calcination time on the physicochemical properties and photocatalytic performance of carbon and nitrogen co-doped tio2 nanoparticles

Mouele, Emile Salomon Massima; Dinu, Mihaela; Cummings, Franscious; Fatoba, Ojo O; Myint, Myo Tay Zar; Kyaw, Htet Htet; Parau, Anca C; Vladescu, Alina; Francesconi, M. Grazia; Pescetelli, Sara; Di Carlo, Aldo; Agresti, Antonio; Al-Abri, Mohammed; Dobretsov, Sergey; Braic, Mariana; Petrik, Leslie F

Authors

Emile Salomon Massima Mouele

Mihaela Dinu mihaela.dinu@inoe.rom.d.

Franscious Cummings fcummings@uwc.ac.za

Ojo O Fatoba

Myo Tay Zar Myint

Htet Htet Kyaw

Anca C Parau anca.parau@inoe.roa.c.p.

Alina Vladescu alinava@inoe.roa.v.

Sara Pescetelli pescetel@uniroma2.its.p.

Aldo Di Carlo aldo.dicarlo@uniroma2.it

Antonio Agresti

Mohammed Al-Abri alabri@squ.edu.om

Sergey Dobretsov sergey@squ.edu.om

Mariana Braic mariana.braic@inoe.rom.b.

Leslie F Petrik lpetrik@uwc.ac.zal.f.p.



Abstract

The application of highly active nano catalysts in advanced oxidation processes (AOPs) improves the production of non-selective hydroxyl radicals and co-oxidants for complete remediation of polluted water. This study focused on the synthesis and characterisation of a highly active visible light C-N-co-doped TiO2 nano catalyst that we prepared via the sol-gel method and pyrolysed at 350 °C for 105 min in an inert atmosphere to prevent combustion of carbon moieties. Then we prolonged the pyrolysis holding time to 120 and 135 min and studied the effect of these changes on the crystal structure, particle size and morphology, electronic properties and photocatalytic performance. The physico-chemical characterisation proved that alteration of pyrolysis holding time allows control of the amount of carbon in the TiO2 catalyst causing variations in the band gap, particle size and morphology and induced changes in electronic Catalysts 2020, 10, 847 2 of 27 properties. The C-N-TiO2 nano composites were active under both visible and UV light. Their improved activity was ascribed to a low electron-hole pair recombination rate that enhanced the generation of OH. and related oxidants for total deactivation of O.II dye. This study shows that subtle differences in catalyst preparation conditions affect its physico-chemical properties and catalytic efficiency under solar and UV light.

Citation

Mouele, E. S. M., Dinu, M., Cummings, F., Fatoba, O. O., Myint, M. T. Z., Kyaw, H. H., …Petrik, L. F. (2020). Effect of calcination time on the physicochemical properties and photocatalytic performance of carbon and nitrogen co-doped tio2 nanoparticles. Catalysts, 10(8), 1-27. https://doi.org/10.3390/catal10080847

Journal Article Type Article
Acceptance Date Jul 10, 2020
Online Publication Date Jul 28, 2020
Publication Date Aug 1, 2020
Deposit Date Jul 29, 2020
Publicly Available Date Aug 6, 2020
Journal Catalysts
Electronic ISSN 2073-4344
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 10
Issue 8
Article Number 847
Pages 1-27
DOI https://doi.org/10.3390/catal10080847
Keywords nano-photo catalysts; pyrolysis; holding time; band gap; crystal structure; particle size; photocatalytic activity; recombination rate
Public URL https://hull-repository.worktribe.com/output/3549036
Publisher URL https://www.mdpi.com/2073-4344/10/8/847

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