期刊
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
卷 89, 期 9, 页码 1425-1431出版社
WILEY
DOI: 10.1002/jctb.4227
关键词
photocatalytic reduction; bromate; organic compounds; metal nanoparticles
类别
资金
- 973 project [2010CB933604]
- National Natural Science Foundation of China [21125731, 51221892]
BACKGROUND: The plasmon-induced photocatalytic reduction of bromate (BrO3-) was investigated in visible-light irradiated Au-Ag-AgI/Al2O3 suspension. The Br-3(-) reduction process was studied in detail. RESULTS: The catalyst was found to be highly effective for the reduction of Br-3(-) from pH 3 to 6. An enhancement of the electrical interaction between Br-3(-) and the positively charged surface of the photocatalyst favored adsorption and reduction of Br-3(-). Organic compounds such as ethanol could react as sacrificial electron donors with excited holes (h(+)) on the metal nanoparticles (NPs) to accelerate electron transfer, inhibiting the release of metal ions and the recombination of h(+) and electrons, hence promoting photocatalytic reduction of Br-3(-). Electron quenching and cyclic voltammetry studies under a variety of experimental conditions verified that Br-3(-) trapped conduction band electrons of AgI from the excited metal NPs were reduced, competing with O-2. CONCLUSION: The photocatalyst Au-Ag-AgI/Al2O3 exhibited particularly good reduction of Br-3(-) under visible-light irradiation. The Br-3(-) reduction was highly favored at acidic condition due to the greater adsorption of Br-3(-) onto the catalyst. This finding indicates that this visible-light-driven catalyst could be applied to the reduction of some oxidative pollutants or even simultaneous removal of both oxidative and reductive pollutants. (C) 2013 Society of Chemical Industry
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据