Sol-gel synthesis and enhanced photocatalytic activity of doped bismuth tungsten oxide composite

被引：21

作者：

Xu, Xuetang ^{[1
,2
]}

Ge, Yuanxing ^{[1
,2
]}

Wang, Hong ^{[2
]}

Li, Bin ^{[1
,2
]}

Yu, Liuhui ^{[2
]}

Liang, Yanyan ^{[2
]}

Chen, Kun ^{[2
]}

Wang, Fan ^{[2
]}

机构：

[1] Guangxi Univ, Sch Chem & Chem Engn, Guangxi Key Lab Petrochem Resource Proc & Proc In, Nanning 530004, Peoples R China

[2] Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China

来源：

MATERIALS RESEARCH BULLETIN | 2016年 / 73卷

基金：

中国国家自然科学基金;

关键词：

Composites; Interfaces; Oxides; Sol gel chemistry; Catalytic properties; VISIBLE-LIGHT; CRYSTAL-STRUCTURE; BI2WO6; HETEROJUNCTION; DEGRADATION; NANOCRYSTALS; PERFORMANCE; 0.7-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.8; PHOTODEGRADATION; SEMICONDUCTOR;

D O I：

10.1016/j.materresbull.2015.09.024

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Pristine Bi2WO6 and Bi2WO6/Bi14W2O27 photocatalysts were synthesized by sol-gel method using Co(II) cation as dopant. The influence of Co dopant to the formation of Bi2WO6/Bi14W2O27 heterostructure composite was discussed. The photocatalytic activities of as-prepared samples were evaluated sufficiently by using rhodamine B as target organic pollutants under visible light. The as-prepared Bi2WO6/Bi14W2O27 heterostructure achieved enhanced optical absorption in the visible-light region, and exhibited much higher photocatalytic activities than that of pristine Bi2WO6. The optimum Bi/Co molar ratio and calcining temperature were also explored. The enhanced activities were attributed to the formation of heterostructure in suppressing the recombination of photo-generated carriers. The Co dopant species would participate to reduce the charge carrier recombination by acting as trapping sites for photogenerated charges. A possible photocatalytic mechanism over Bi2WO6/Bi14W2O27 heterostructure was proposed. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：385 / 393

页数：9

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