biobr-bi2s3纳米片层复合光催化剂制备及光催化性能研究.doc

文档介绍：
BiOBr/Bi2S3 纳米片层复合光催化剂的制备
及光催化性能研究#
牟凯,祁影,王长华*
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(北华大学化学与生物学院,吉林,132013)
摘要:近年研究表明卤氧化铋在可见光催化方面具有广阔的前景。本文结合溶剂热及室温离
子交换的方法制备了 BiOBr/Bi2S3 纳米片复合光催化剂。XRD, Raman, UV-Vis-DRS, SEM 及
TEM 表征结果表明 BiOBr 向 Bi2S3 结构的拓扑相变过程使得 BiOBr 纳米片层的形貌得到很
好地保持, Bi2S3 的引入拓宽了催化剂的可见光响应范围。以罗丹明 B 为降解对象,考察了
离子源浓度及激发光源波长对光催化性能的影响。光催化测试结果显示太阳光下
BiOBr/Bi2S3 纳米片复合光催化剂活性并未明显增强,但在 440 nm 滤光片下 BiOBr/Bi2S3 光
催化活性明显优于 BiOBr,这主要归因于 Bi2S3 的光敏化与 BiOBr/Bi2S3 异质结抑制光生电子
空穴的复合二者之间的协同效应。本研究为开发新型高效的纳米光催化剂提供了新体系,新
思路。
关键词:物理化学;光催化;异质结;纳米片层;可见光
中图分类号:
BiOBr/Bi2S3 posite photocatalyst:preparation
and photocatalytic properties
MU Kai, QI Ying, WANG Changhua
(College of Chemistry and Biology,Beihua University,Jilin, 132013)
Abstract: Recent study shows that BiOX are potential visible light photocatalyst. in this study, we
combine a solvent thermal and ion-exchange method to BiOBr/Bi2S3 posite. Structural
characterization results including XRD, Raman, UV-Vis-DRS, SEM and TEM show that phase
transition from BiOBr to Bi2S3 has occurred without morphology change when thioacetamide is
employed as sulfur source, and Bi2S3 favorable increase the visible light response of BiOBr. The effects
of concentration of reactant for ion exchange and wavelength of irradiation are investigated via
rodamine B degradation. The photocatalytic test results show that there is no significant enhanc