期刊
CHEMCATCHEM
卷 10, 期 14, 页码 3040-3048出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201701965
关键词
bismuth; doping; iron; oxygen; photochemistry
资金
- National Natural Science Foundation of China [21573133, 21603118]
- Natural Science Foundation of Shandong Province of China [ZR2016BQ04]
- Independent Innovation Foundation of Shandong University in China [2016JC032]
The metal-doping of Bi-based oxide photocatalysts to enhance the photocatalytic performance has been a research hotspot in recent years, but the research on the mechanism of doping-induced photoactivity improvement is still incomplete. To illustrate the mechanism completely and clearly, Fe-doped Bi2WO6, as an example, was synthesized by a facile hydrothermal route. Fe-doped Bi2WO6 exhibits a much higher photoactivity than pure Bi2WO6 in the degradation of RhodamineB (RhB) and salicylic acid (SA). By replacing W6+, the Fe3+ doping narrows the energy band gap and generates many oxygen vacancies, which can increase the adsorption of both RhB and SA, and the introduced defect and Fe-doping energy levels in the band gap of Bi2WO6 increase the separation efficiency of photoinduced charge carriers significantly. These lead to the considerable photoactivity enhancement of Fe-doped Bi2WO6. The photoactivity of Fe-doped Bi2WO6 is stable and superior to that of most reported modified Bi2WO6 photocatalysts. This work illustrates in detail the mechanism for the photoactivity improvement of Fe-doped Bi2WO6, which benefits the research of other metal-doped photocatalysts.
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