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Visible-Light-Active N-Doped TiO2 Photocatalysts: Synthesis from TiOSO4, Characterization, and Enhancement of Stability via Surface Modification Full article

Journal Nanomaterials
, E-ISSN: 2079-4991
Output data Year: 2022, Volume: 12, Number: 23, Article number : 4146, Pages count : 24 DOI: 10.3390/nano12234146
Tags photocatalytic oxidation; visible light; N-doped TiO2; copper (Cu); nanocomposite; action spectrum; EPR; stability
Authors Kovalevskiy Nikita 1 , Svintsitskiy Dmitry 2 , Cherepanova Svetlana 2 , Yakushkin Stanislav 3 , Martyanov Oleg 3 , Selishcheva Svetlana 4 , Gribov Evgeny 1 , Kozlov Denis 1 , Selishchev Dmitry 1
Affiliations
1 Department of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
2 Department of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
3 Department of Physicochemical Methods of Research, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
4 Engineering Center, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia

Funding (1)

1 Russian Science Foundation 20-73-10135

Abstract: This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO2. The synthesis is performed using titanium oxysulfate as a low-cost inorganic precursor and ammonia as a precipitating agent, as well as a source of nitrogen. Mixing the reagents under a control of pH leads to an amorphous titanium oxide hydrate, which can be further successfully converted to nanocrystalline anatase TiO2 through calcination in air at an increased temperature. The as-prepared N-doped TiO2 provides the complete oxidation of volatile organic compounds both under UV and visible light, and the action spectrum of N-doped TiO2 correlates to its absorption spectrum. The key role of paramagnetic nitrogen species in the absorption of visible light and in the visible-light-activity of N-doped TiO2 is shown using the EPR technique. Surface modification of N-doped TiO2 with copper species prevents its intense deactivation under highly powerful radiation and results in a nanocomposite photocatalyst with enhanced activity and stability. The photocatalysts prepared under different conditions are discussed regarding the effects of their characteristics on photocatalytic activity under UV and visible light.
Cite: Kovalevskiy N. , Svintsitskiy D. , Cherepanova S. , Yakushkin S. , Martyanov O. , Selishcheva S. , Gribov E. , Kozlov D. , Selishchev D.
Visible-Light-Active N-Doped TiO2 Photocatalysts: Synthesis from TiOSO4, Characterization, and Enhancement of Stability via Surface Modification
Nanomaterials. 2022. V.12. N23. 4146 :1-24. DOI: 10.3390/nano12234146 WOS Scopus РИНЦ AN PMID OpenAlex
Dates:
Submitted: Oct 29, 2022
Accepted: Nov 21, 2022
Published online: Nov 23, 2022
Identifiers:
Web of science: WOS:000897303400001
Scopus: 2-s2.0-85143718435
Elibrary: 50359403
Chemical Abstracts: 2022:3123244
PMID: 36500767
OpenAlex: W4310036282
Citing:
DB Citing
Scopus 14
Web of science 13
Elibrary 11
OpenAlex 16
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