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题名: Oxygen vacancy enhanced photostability and activity of plasmon-Ag composites in the visible to near-infrared region for water purification
作者: Ji, Huanhuan; Lyu, Lai; Zhang, Lili; An, Xiaoqiang; Hu, Chun
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
出版日期: 2016-12-15
卷号: 199, 期号:0, 页码:230-240
关键词: Oxygen vacancy ; Interfacial charge transfer ; Plasmonic-Ag composites ; Ag+ releasing ; Entire solar spectrum
DOI: 10.1016/j.apcatb.2016.06.037
部门归属: 中国科学院饮用水科学与技术重点实验室
英文摘要: Solid solution of BiOBr and BHO (BiO(OH)(0.06)Br-0.94) with abundant oxygen vacancies was supported on Ag/AgBr using precipitation and deposition-precipitation methods. The photocatalyst showed high and stable photocatalytic activity for the degradation of chlorophenols and azodyes in water under visible to NIR light irradiation without any release of Ag+, which came from visible-excited AgBr and the SPR of Ag NPs in the:visible and NIR region. The different interfacial charge-transfer processes were verified on the basis of cyclic voltammetry analyses and all experimental information. The conduction band (CB) electrons of photoexcited AgBr reacted with the adsorbed oxygen forming O-2(center dot-), while the valence band (VB) holes of AgBr were transported the VB of BiO(OH)(0.06)Br-0.94 to oxidize organic pollutants or H2O to (OH)-O-center dot. The plasmon-induced electrons from Ag NPs transferred to the CB of AgBr reacting with the adsorbed oxygen to O-2(center dot-), while the electrons trapped on the oxygen vacancies of BiO(OH)(0.06)Br-0.94 transferred to Ag NPs recombining with the plasmon-induced holes, inhibiting the release of Ag+, and the resulted VB holes of BiO(OH)(0.06)Br-0.94 oxidized organic compound. These interfacial charge transfers. evidenced the high photOactivity and photostability of BiO(OH)(0.06)Br-0.94/Ag/AgBr. (C) 2016 Elsevier B.V. All rights reserved.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36204
Appears in Collections:中国科学院饮用水科学与技术重点实验室_期刊论文

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