N-Rich Doped Anatase TiO<sub>2</sub> with Smart Defect Engineering as Efficient Photocatalysts for Acetaldehyde Degradation
Nitrogen (N) doping is an effective strategy for improving the solar-driven photocatalytic performance of anatase TiO<sub>2</sub>, but controllable methods for nitrogen-rich doping and associated defect engineering are highly desired. In this work, N-rich doped anatase TiO<sub>2<...
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MDPI AG
2022-05-01
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| author | Mingzhuo Wei Zhijun Li Peijiao Chen Lei Sun Shilin Kang Tianwei Dou Yang Qu Liqiang Jing |
| author_facet | Mingzhuo Wei Zhijun Li Peijiao Chen Lei Sun Shilin Kang Tianwei Dou Yang Qu Liqiang Jing |
| author_sort | Mingzhuo Wei |
| collection | DOAJ |
| description | Nitrogen (N) doping is an effective strategy for improving the solar-driven photocatalytic performance of anatase TiO<sub>2</sub>, but controllable methods for nitrogen-rich doping and associated defect engineering are highly desired. In this work, N-rich doped anatase TiO<sub>2</sub> nanoparticles (4.2 at%) were successfully prepared via high-temperature nitridation based on thermally stable H<sub>3</sub>PO<sub>4</sub>-modified TiO<sub>2</sub>. Subsequently, the associated deep-energy-level defects such as oxygen vacancies and Ti<sup>3+</sup> were successfully healed by smart photo-Fenton oxidation treatment. Under visible-light irradiation, the healed N-doped TiO<sub>2</sub> exhibited a ~2-times higher activity of gas-phase acetaldehyde degradation than the non-treated one and even better than standard P25 TiO<sub>2</sub> under UV-visible-light irradiation. The exceptional performance is attributed to the extended spectral response range from N-rich doping, the enhanced charge separation from hole capturing by N-doped species, and the healed defect levels with the proper thermodynamic ability for facilitating O<sub>2</sub> reduction, depending on the results of ∙O<sub>2</sub><sup>−</sup> radicals and defect measurement by electron spin resonance, X-ray photoelectron spectroscopy, atmosphere-controlled surface photovoltage spectra, etc. This work provides an easy and efficient strategy for the preparation of high-performance solar-driven TiO<sub>2</sub> photocatalysts. |
| first_indexed | 2024-03-10T03:52:02Z |
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| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T03:52:02Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-c657be51ab9744249ab937cf77fc55ca2023-11-23T08:56:10ZengMDPI AGNanomaterials2079-49912022-05-01129156410.3390/nano12091564N-Rich Doped Anatase TiO<sub>2</sub> with Smart Defect Engineering as Efficient Photocatalysts for Acetaldehyde DegradationMingzhuo Wei0Zhijun Li1Peijiao Chen2Lei Sun3Shilin Kang4Tianwei Dou5Yang Qu6Liqiang Jing7Key Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education), School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology, Heilongjiang University, Harbin 150080, ChinaKey Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education), School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology, Heilongjiang University, Harbin 150080, ChinaKey Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education), School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology, Heilongjiang University, Harbin 150080, ChinaKey Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education), School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology, Heilongjiang University, Harbin 150080, ChinaKey Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education), School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology, Heilongjiang University, Harbin 150080, ChinaKey Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education), School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology, Heilongjiang University, Harbin 150080, ChinaKey Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education), School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology, Heilongjiang University, Harbin 150080, ChinaKey Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education), School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology, Heilongjiang University, Harbin 150080, ChinaNitrogen (N) doping is an effective strategy for improving the solar-driven photocatalytic performance of anatase TiO<sub>2</sub>, but controllable methods for nitrogen-rich doping and associated defect engineering are highly desired. In this work, N-rich doped anatase TiO<sub>2</sub> nanoparticles (4.2 at%) were successfully prepared via high-temperature nitridation based on thermally stable H<sub>3</sub>PO<sub>4</sub>-modified TiO<sub>2</sub>. Subsequently, the associated deep-energy-level defects such as oxygen vacancies and Ti<sup>3+</sup> were successfully healed by smart photo-Fenton oxidation treatment. Under visible-light irradiation, the healed N-doped TiO<sub>2</sub> exhibited a ~2-times higher activity of gas-phase acetaldehyde degradation than the non-treated one and even better than standard P25 TiO<sub>2</sub> under UV-visible-light irradiation. The exceptional performance is attributed to the extended spectral response range from N-rich doping, the enhanced charge separation from hole capturing by N-doped species, and the healed defect levels with the proper thermodynamic ability for facilitating O<sub>2</sub> reduction, depending on the results of ∙O<sub>2</sub><sup>−</sup> radicals and defect measurement by electron spin resonance, X-ray photoelectron spectroscopy, atmosphere-controlled surface photovoltage spectra, etc. This work provides an easy and efficient strategy for the preparation of high-performance solar-driven TiO<sub>2</sub> photocatalysts.https://www.mdpi.com/2079-4991/12/9/1564anatase TiO<sub>2</sub>N-rich dopingdefect healingcharge separationphotocatalytic acetaldehyde degradation |
| spellingShingle | Mingzhuo Wei Zhijun Li Peijiao Chen Lei Sun Shilin Kang Tianwei Dou Yang Qu Liqiang Jing N-Rich Doped Anatase TiO<sub>2</sub> with Smart Defect Engineering as Efficient Photocatalysts for Acetaldehyde Degradation Nanomaterials anatase TiO<sub>2</sub> N-rich doping defect healing charge separation photocatalytic acetaldehyde degradation |
| title | N-Rich Doped Anatase TiO<sub>2</sub> with Smart Defect Engineering as Efficient Photocatalysts for Acetaldehyde Degradation |
| title_full | N-Rich Doped Anatase TiO<sub>2</sub> with Smart Defect Engineering as Efficient Photocatalysts for Acetaldehyde Degradation |
| title_fullStr | N-Rich Doped Anatase TiO<sub>2</sub> with Smart Defect Engineering as Efficient Photocatalysts for Acetaldehyde Degradation |
| title_full_unstemmed | N-Rich Doped Anatase TiO<sub>2</sub> with Smart Defect Engineering as Efficient Photocatalysts for Acetaldehyde Degradation |
| title_short | N-Rich Doped Anatase TiO<sub>2</sub> with Smart Defect Engineering as Efficient Photocatalysts for Acetaldehyde Degradation |
| title_sort | n rich doped anatase tio sub 2 sub with smart defect engineering as efficient photocatalysts for acetaldehyde degradation |
| topic | anatase TiO<sub>2</sub> N-rich doping defect healing charge separation photocatalytic acetaldehyde degradation |
| url | https://www.mdpi.com/2079-4991/12/9/1564 |
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