新型氯化改性BiOBr/TiO_(2)的可见光催化活性  

Photocatalysis of Chloridized BiOBr/TiO_(2) under Visual Light

作　　者：王磊[1,2] 康凯[2] 韩浩[2] 彭猛[1] 王德生 许嘉钰[1] WANG Lei;KANG Kai;HAN Hao;PENG Meng;WANG Desheng;XU Jiayu(School of Environment,Tsinghua University,100084;State Key Laboratory of NBC Protection for Civilian,Research Institute of Chemical Defense,Beijing,102205)

机构地区：[1]清华大学环境学院,100084 [2]国民核生化灾害防护国家重点实验室,防化研究院,北京102205

出　　处：《水处理技术》2022年第3期70-73,78,共5页Technology of Water Treatment

摘　　要：本文利用溶胶凝胶法制备了溴氧铋/二氧化钛复合光催化材料。以甲基橙为目标污染物,研究了溴氧铋含量对复合材料的可见光催化特性的影响,随后通过表面氯化改性,进一步提升了光催化能力。最后利用XRD、UV-Vis DRS、TEM、EPR等方法对催化材料进行表征,分析其光激发原理。结果表明,新型复合材料具有较好的可见光响应,对有机物的降解能力优于溴氧铋和二氧化钛单体,这是由于二者形成了半导体异质结,光生电子传递降低了载流子复合率,羟基自由基生成量增加,而表面氯化引入了新的氯自由基,进一步提高反应活性。In this paper,BiOBr/TiO_(2) composites with different ratios were prepared via the sol-gel method,and the photocatalytic performance towards methyl orange was tested under visual light.Then the composites were characterized by XRD,UV-Vis DRS,TEM,and EPR,and these characteristics were used to analyze the photocatalytic principle considering surface morphology and free radicals.The results showed that the new composites possess stronger visual catalysis than that of BiOBr or TiO_(2) single catalysis.It has been proved that the BiOBr and TiO_(2) can form semiconductor heterojunction to reduce the annihilating of photo-carriers by separating electrons and holes.And the chlorine radical will be introduced into photoreaction to improve the degradation by chlorination.

关 键 词：BiOBr TiO_(2) 光催化 氯自由基 

分 类 号：O644.1[理学—物理化学]