Bi5O7I/Bi2O3: A novel heterojunction-structured visible light-driven photocatalyst

被引：27
|
作者：
Cheng, Lijun [1 ]
Liu, Xiao [1 ]
Kang, Yong [1 ]
机构：
[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
来源：
MATERIALS LETTERS | 2014年 / 134卷
关键词：
Bi5O7I/Bi2O3; Heterojunction; Visible light; Photocatalyst; Composite materials; Semiconductors; BI2O3; IRRADIATION; PERFORMANCE; DEGRADATION; MECHANISM;
D O I：
10.1016/j.matlet.2014.07.089
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Novel Bi5O7I/Bi2O3 heterojunction-structured visible light-driven photocatalyst was prepared via chemical etching of Bi2O3 obtained by chemical precipitation method. The X-ray diffraction patterns confirmed the formation of Bi5O7I. The UV-vis diffuse reflectance spectra indicated that the absorption edge of Bi5O7I/Bi2O3 composite was 632 nm, which shifted towards longer wavelength than Bi2O3. Besides, the separation efficiency of electron-hole pairs in Bi5O7I/Bi2O3 heterojunction was higher than in Bi2O3, as implied by the photoluminescence emission spectra. The photocatalytic activities of Bi5O7I/Bi2O3 composite and Bi2O3 were evaluated and compared through degradation of malachite green and the results showed that Bi5O7I/Bi2O3 composite had better activity than Bi2O3. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：218 / 221
页数：4
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