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| 论文编号: |
122214O120120146 |
| 第一作者所在部门: |
704组 |
| 中文论文题目: |
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| 英文论文题目: |
Enhanced visible photocatalytic activity of titania–silica photocatalysts: effect of carbon and silver doping
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| 论文题目英文: |
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| 作者: |
陈其凤
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| 论文出处: |
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| 刊物名称: |
Catalysis Science &Technology
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| 年: |
2012
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| 卷: |
2 |
| 期: |
6 |
| 页: |
1213-1220 |
| 联系作者: |
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| 收录类别: |
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| 影响因子: |
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| 摘要: |
To utilize efficiently visible light in photocatalytic reactions, a series of doped TiO2 photocatalysts were synthesized via a facile solvothermal method. The photocatalysts were characterized with various techniques. The results indicated that all the photocatalysts were of an anatase phase, the
Ag0.010C2.0–TS0.20 sample possessed the largest surface area (306.0 m2 g1) and pore volume(2.05 cm3 g1). The carbon dopant existed in the surface layer of the TiO2–SiO2 composite and narrowed the energy band gap, which induced visible light absorption. Silver existed on the particle surface and in two forms, Ag+ and Ag0, which acted together to inhibit the recombination of
photogenerated electrons and holes. The photoactivities were evaluated by decomposition of RhB under visible irradiation. It was found that the Ag–C/TS photocatalyst exhibited the highest visible photoactivity, with the molar ratios of Ag–Ti, and C–Ti of 0.005, and 2.0, respectively, corresponding
to the reaction rate constant 2.09 h1. The reaction rate was 52.3, 11.2 and 2.33 times higher than that of TiO2 (0.04 h1), Ag0.005–TiO2 (0.186 h1) and C2.0–TiO2 (0.897 h1), respectively. The enhanced visible photocatalytic activity can be attributed to the synergetic effects of silver and carbon
doping, as well as silicon introduction. The photocatalytic reaction mechanism was verified with ESR technique; furthermore, both the hydroxyl radical and superoxide radical played a critical role on the photocatalytic reaction, in addition, DMPO–H was found in the ESR experiments. |
| 英文摘要: |
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