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Bi2WO6光催化剂与C60的协同效应及可见光照射下增强的光活性。

Synergetic effect of Bi2WO6 photocatalyst with C60 and enhanced photoactivity under visible irradiation.

作者信息

Zhu Shengbao, Xu Tongguang, Fu Hongbo, Zhao Jincai, Zhu Yongfa

机构信息

Department of Chemistry, Tsinghua University, Beijing, 100084, People's Republic of China.

出版信息

Environ Sci Technol. 2007 Sep 1;41(17):6234-9. doi: 10.1021/es070953y.

Abstract

Fullerene (C60)-modified Bi2WO6 photocatalyst is prepared by a simple absorbing process. The as-prepared samples show the high efficiency for the degradation of nonbiodegradable azodyes methylene blue (MB) and rhodamine B (RhB) under visible light (lamda >420 nm) and simulated solar light (lamda >290 nm). After being modified by C60, the photocatalytic activities of Bi2WO6 samples increase about 5.0 and 1.5 times for the degradation of MB and RhB under visible light irradiation, whereas 4.6 and 2.1 times under xenon lamp irradiation, respectively. The enhanced photocatalytic activity for C60-modified Bi2WO6 comes from the high migration efficiency of photoinduced electrons on the interface of C60 and Bi2WO6 which is produced by the interaction of Bi2WO6 and C60 with the conjugative pi-system. The optimum synergetic effect is found at a weight ratio of 1.25 wt % (C60/Bi2WO6). The photocatalytic reaction process of C60-modified Bi2WO6 is mainly governed by direct holes and O2*- oxidation.

摘要

富勒烯(C60)修饰的Bi2WO6光催化剂通过简单的吸附工艺制备。所制备的样品在可见光(λ>420 nm)和模拟太阳光(λ>290 nm)下对偶氮染料亚甲基蓝(MB)和罗丹明B(RhB)的降解显示出高效率。经C60修饰后,Bi2WO6样品在可见光照射下对MB和RhB降解的光催化活性分别提高约5.0倍和1.5倍,而在氙灯照射下分别提高4.6倍和2.1倍。C60修饰的Bi2WO6光催化活性增强源于Bi2WO6与C60通过共轭π-体系相互作用在C60和Bi2WO6界面上光生电子的高迁移效率。在1.25 wt%(C60/Bi2WO6)的重量比下发现了最佳协同效应。C60修饰的Bi2WO6的光催化反应过程主要由直接空穴和O2*-氧化控制。

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