期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 586, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2019.124079
关键词
AgBr/alpha-Ag(2)WO(4)composite; One-pot preparation; Photocatalysis; Dye-degradation; Visible-light illumination
资金
- National Natural Science Foundation of China [21676022, 21706004]
- Fundamental Research Funds for the Central Universities [BHYC1701A, XK1802-6]
Recently, semiconductor photocatalysts have received much attention in the field of eliminating organic pollutants in waste-water without causing any new accompanied secondary pollution. Herein, we have reported a new visible-light-driven photocatalyst of AgBr/alpha-Ag2WO4 composites with high efficiency of pollution elimination. A series of composites were prepared with addition of various amounts of cetyltrimethylammonium bromide (CTAB, from 0.1-2.0 m moL) to the Ag2WO4 precipate-containing solution via a facile one-pot hydrothermal route. The as-prepared composites were characterized by various techniques like powder XRD, UV-vis DRS, SEM, element mapping, HR-TEM, XPS and PL analyses. Photo-catalytic behaviors of these AgBr/alpha-Ag2WO4 composites were examined through the removal of Rhodamine B (RhB) under visible-light radiation. It is confirmed that the AgBr/alpha-Ag2WO4 composites show the higher photocatalytic ability than pure AgBr and alpha-Ag2WO4 samples. Particularly, the AgBr/alpha-Ag2WO4 composite obtained with the addition of 1.0 m moL of CTAB possesses 100% degradation of RhB in 60 min and an outstanding photostability. The enhanced photocatalytic activity of the AgBr/alpha-Ag2WO4 composite is mainly attributed to the creation of heterojunction on the interface between AgBr and alpha-Ag2WO4, which can efficiently facilitate the rapid charge separation and recombination reduction of the photo-created electron-holes pairs. A photo-degradation mechanism of AgBr/alpha-Ag2WO4 composite is also discussed based on the band position and radical trapping tests. As a result, the as-prepared AgBr/alpha-Ag2WO4 composite is proved to be a promising candidate of photocatalyst for the treatment of wastewater.
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