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

被引：20
|
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
收藏
页码：385 / 393
页数：9
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