Unusual reactivity of visible-light-responsive AgBr-BiOBr heterojunction photocatalysts

被引：239

作者：

Kong, Liang ^{[1
]}

Jiang, Zheng ^{[1
,2
]}

Lai, Henry H. ^{[1
]}

Nicholls, Rebecca J. ^{[3
]}

Xiao, Tiancun ^{[1
]}

Jones, Martin O. ^{[4
]}

Edwards, Peter P. ^{[1
]}

机构：

[1] Univ Oxford, Inorgan Chem Lab, Dept Chem, Oxford OX1 3QR, England

[2] Univ Exeter, Environm & Sustainabil Inst, Penryn TR10 9EZ, Cornwall, England

[3] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[4] Rutherford Appleton Lab, STFC, Chilton OX11 0QX, England

来源：

JOURNAL OF CATALYSIS | 2012年 / 293卷

基金：

英国工程与自然科学研究理事会;

关键词：

AgBr-BiOBr; Heterojunction; Photocatalysis; Visible-light; Rhodamine B; Deactivation; ELECTRONIC-STRUCTURE; IRRADIATION; DEGRADATION; BACTERIA; BROMIDE; DIOXIDE; TIO2;

D O I：

10.1016/j.jcat.2012.06.011

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

AgBr-BiOBr heterojunction photocatalysts with varying loadings of AgBr (<5.0 wt% AgBr) were synthesized through an effective co-precipitation method and used for the photodegradation of Rhodamine B under visible-light irradiation. Superior photocatalytic activities relative to that of pure BiOBr were observed on the AgBr-BiOBr catalysts with low AgBr loading (up to 0.5 wt%). Higher AgBr loadings (>0.5 wt%) lead to isolated AgBr species and reduced photocatalytic activity. Among such catalysts, the AgBr (0.2 wt%)-BiOBr exhibits the highest visible-light-responsive photoactivity, which can decolorize Rhodamine B within 30 min. However, these AgBr-BiOBr materials gradually lost their photoactivity in the cycling photocatalytic tests. Possible mechanisms for both the enhanced photocatalytic activity and deactivation of the AgBr-BiOBr heterojunctions were proposed on basis of theoretical speculation and experimental observations. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：116 / 125

页数：10

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