Visible-Light-Active N-Doped TiO<sub>2</sub> Photocatalysts: Synthesis from TiOSO<sub>4</sub>, Characterization, and Enhancement of Stability Via Surface Modification
This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO<sub>2</sub>. The synthesis is performed using titanium oxysulfate as a low-cost inorganic precursor and ammonia as a precipitating agent...
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| Format: | Article |
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MDPI AG
2022-11-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/23/4146 |
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| author | Nikita Kovalevskiy Dmitry Svintsitskiy Svetlana Cherepanova Stanislav Yakushkin Oleg Martyanov Svetlana Selishcheva Evgeny Gribov Denis Kozlov Dmitry Selishchev |
| author_facet | Nikita Kovalevskiy Dmitry Svintsitskiy Svetlana Cherepanova Stanislav Yakushkin Oleg Martyanov Svetlana Selishcheva Evgeny Gribov Denis Kozlov Dmitry Selishchev |
| author_sort | Nikita Kovalevskiy |
| collection | DOAJ |
| description | This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO<sub>2</sub>. 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 TiO<sub>2</sub> through calcination in air at an increased temperature. The as-prepared N-doped TiO<sub>2</sub> provides the complete oxidation of volatile organic compounds both under UV and visible light, and the action spectrum of N-doped TiO<sub>2</sub> 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 TiO<sub>2</sub> is shown using the EPR technique. Surface modification of N-doped TiO<sub>2</sub> 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. |
| first_indexed | 2024-03-09T17:38:58Z |
| format | Article |
| id | doaj.art-b3ebd68220e441f6838067664f1ff61e |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T17:38:58Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-b3ebd68220e441f6838067664f1ff61e2023-11-24T11:46:11ZengMDPI AGNanomaterials2079-49912022-11-011223414610.3390/nano12234146Visible-Light-Active N-Doped TiO<sub>2</sub> Photocatalysts: Synthesis from TiOSO<sub>4</sub>, Characterization, and Enhancement of Stability Via Surface ModificationNikita Kovalevskiy0Dmitry Svintsitskiy1Svetlana Cherepanova2Stanislav Yakushkin3Oleg Martyanov4Svetlana Selishcheva5Evgeny Gribov6Denis Kozlov7Dmitry Selishchev8Department of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, RussiaDepartment of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk 630090, RussiaDepartment of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk 630090, RussiaDepartment of Physicochemical Methods of Research, Boreskov Institute of Catalysis, Novosibirsk 630090, RussiaDepartment of Physicochemical Methods of Research, Boreskov Institute of Catalysis, Novosibirsk 630090, RussiaEngineering Center, Boreskov Institute of Catalysis, Novosibirsk 630090, RussiaDepartment of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, RussiaDepartment of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, RussiaDepartment of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, RussiaThis paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO<sub>2</sub>. 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 TiO<sub>2</sub> through calcination in air at an increased temperature. The as-prepared N-doped TiO<sub>2</sub> provides the complete oxidation of volatile organic compounds both under UV and visible light, and the action spectrum of N-doped TiO<sub>2</sub> 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 TiO<sub>2</sub> is shown using the EPR technique. Surface modification of N-doped TiO<sub>2</sub> 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.https://www.mdpi.com/2079-4991/12/23/4146photocatalytic oxidationvisible lightN-doped TiO<sub>2</sub>copper (Cu)nanocompositeaction spectrum |
| spellingShingle | Nikita Kovalevskiy Dmitry Svintsitskiy Svetlana Cherepanova Stanislav Yakushkin Oleg Martyanov Svetlana Selishcheva Evgeny Gribov Denis Kozlov Dmitry Selishchev Visible-Light-Active N-Doped TiO<sub>2</sub> Photocatalysts: Synthesis from TiOSO<sub>4</sub>, Characterization, and Enhancement of Stability Via Surface Modification Nanomaterials photocatalytic oxidation visible light N-doped TiO<sub>2</sub> copper (Cu) nanocomposite action spectrum |
| title | Visible-Light-Active N-Doped TiO<sub>2</sub> Photocatalysts: Synthesis from TiOSO<sub>4</sub>, Characterization, and Enhancement of Stability Via Surface Modification |
| title_full | Visible-Light-Active N-Doped TiO<sub>2</sub> Photocatalysts: Synthesis from TiOSO<sub>4</sub>, Characterization, and Enhancement of Stability Via Surface Modification |
| title_fullStr | Visible-Light-Active N-Doped TiO<sub>2</sub> Photocatalysts: Synthesis from TiOSO<sub>4</sub>, Characterization, and Enhancement of Stability Via Surface Modification |
| title_full_unstemmed | Visible-Light-Active N-Doped TiO<sub>2</sub> Photocatalysts: Synthesis from TiOSO<sub>4</sub>, Characterization, and Enhancement of Stability Via Surface Modification |
| title_short | Visible-Light-Active N-Doped TiO<sub>2</sub> Photocatalysts: Synthesis from TiOSO<sub>4</sub>, Characterization, and Enhancement of Stability Via Surface Modification |
| title_sort | visible light active n doped tio sub 2 sub photocatalysts synthesis from tioso sub 4 sub characterization and enhancement of stability via surface modification |
| topic | photocatalytic oxidation visible light N-doped TiO<sub>2</sub> copper (Cu) nanocomposite action spectrum |
| url | https://www.mdpi.com/2079-4991/12/23/4146 |
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