激进的
氧气
罗丹明B
光催化
化学
光化学
价(化学)
可见光谱
带隙
羟基自由基
无机化学
催化作用
材料科学
有机化学
光电子学
作者
Yang Liu,Bo Wei,Lingling Xu,Hong Gao,Mingyi Zhang
出处
期刊:Chemcatchem
[Wiley]
日期:2015-10-14
卷期号:7 (24): 4076-4084
被引量:129
标识
DOI:10.1002/cctc.201500714
摘要
A comparative study of visible-light-responsive Bi2WO6 and oxygen-deficient Bi2WO6−x nanoplates was conducted. The formation of oxygen vacancy resulted in the band gap narrowing of oxygen-deficient Bi2WO6−x, through an elevation of both of the conduction and valence band positions. FTIR spectra revealed that much more surface hydroxyl groups have been detected after the etching process. The scavengers tests confirmed the generation of ⋅OH radicals during photochemical reaction for Bi2WO6−x, whereas no .OH radicals can be detected for pure Bi2WO6. The photocatalytic activities of optimized Bi2WO6−x on the decomposition of Rhodamine B (RhB) was three times as high as that of pure Bi2WO6. The improvement of photocatalytic activity on degradation of RhB and phenol can be ascribed to the synergistic effect of oxygen deficiency-induced band shifts, together with the large quantities of surface hydroxyl groups providing active sites for the generation of OH radicals (.OH).
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