Mechanistic Study of Visible-Light-Induced Photodegradation of 4-Chlorophenol by TiO2−xNx with Low Nitrogen Concentration
TiO2−x Nx powders with low N-doping concentrations (0.021<𝑥<0.049) were prepared by annealing commercial TiO2 (P-25) under an NH3 flow at 550°C. Regardless of UV or visible case, the photoactivities of the samples decreased as x increased, and TiO1.979N0.021 showed the highest activity for the...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2012/759306 |
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| _version_ | 1832549102654586880 |
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| author | Guangfeng Shang Hongbo Fu Shaogui Yang Tongguang Xu |
| author_facet | Guangfeng Shang Hongbo Fu Shaogui Yang Tongguang Xu |
| author_sort | Guangfeng Shang |
| collection | DOAJ |
| description | TiO2−x Nx powders with low N-doping concentrations (0.021<𝑥<0.049) were prepared by annealing commercial TiO2 (P-25) under an NH3 flow at 550°C. Regardless of UV or visible case, the photoactivities of the samples decreased as x increased, and TiO1.979N0.021 showed the highest activity for the 4-chlorophenol (4-CP) decomposition under the visible-light irradiation. The visible-light response for N-doped TiO2 could arise from an N-induced midgap level, formed above the valence band (O 2p). Electron spin resonance (ESR) measurements and the radical scavenger technologies gave the combined evidence that the active species (•OH and O2•−) are responsible for the photodecomposition of 4-CP over TiO2−xNx under the visible irradiation. A possible photocatalytic mechanism was discussed in detail. |
| format | Article |
| id | doaj-art-7282cbb610fa4f67b8168ed75d91c100 |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-7282cbb610fa4f67b8168ed75d91c1002025-02-03T06:12:12ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2012-01-01201210.1155/2012/759306759306Mechanistic Study of Visible-Light-Induced Photodegradation of 4-Chlorophenol by TiO2−xNx with Low Nitrogen ConcentrationGuangfeng Shang0Hongbo Fu1Shaogui Yang2Tongguang Xu3Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaDepartment of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaState Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, ChinaDepartment of Chemistry, Tsinghua University, Beijing 100084, ChinaTiO2−x Nx powders with low N-doping concentrations (0.021<𝑥<0.049) were prepared by annealing commercial TiO2 (P-25) under an NH3 flow at 550°C. Regardless of UV or visible case, the photoactivities of the samples decreased as x increased, and TiO1.979N0.021 showed the highest activity for the 4-chlorophenol (4-CP) decomposition under the visible-light irradiation. The visible-light response for N-doped TiO2 could arise from an N-induced midgap level, formed above the valence band (O 2p). Electron spin resonance (ESR) measurements and the radical scavenger technologies gave the combined evidence that the active species (•OH and O2•−) are responsible for the photodecomposition of 4-CP over TiO2−xNx under the visible irradiation. A possible photocatalytic mechanism was discussed in detail.http://dx.doi.org/10.1155/2012/759306 |
| spellingShingle | Guangfeng Shang Hongbo Fu Shaogui Yang Tongguang Xu Mechanistic Study of Visible-Light-Induced Photodegradation of 4-Chlorophenol by TiO2−xNx with Low Nitrogen Concentration International Journal of Photoenergy |
| title | Mechanistic Study of Visible-Light-Induced Photodegradation of 4-Chlorophenol by TiO2−xNx with Low Nitrogen Concentration |
| title_full | Mechanistic Study of Visible-Light-Induced Photodegradation of 4-Chlorophenol by TiO2−xNx with Low Nitrogen Concentration |
| title_fullStr | Mechanistic Study of Visible-Light-Induced Photodegradation of 4-Chlorophenol by TiO2−xNx with Low Nitrogen Concentration |
| title_full_unstemmed | Mechanistic Study of Visible-Light-Induced Photodegradation of 4-Chlorophenol by TiO2−xNx with Low Nitrogen Concentration |
| title_short | Mechanistic Study of Visible-Light-Induced Photodegradation of 4-Chlorophenol by TiO2−xNx with Low Nitrogen Concentration |
| title_sort | mechanistic study of visible light induced photodegradation of 4 chlorophenol by tio2 xnx with low nitrogen concentration |
| url | http://dx.doi.org/10.1155/2012/759306 |
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