摘要
采用原位沉淀法构建BiOBr/α-Bi_(2)O_(3)异质结复合物,在α-Bi_(2)O_(3)微棒表面紧密组装BiOBr纳米片。与单一α-Bi_(2)O_(3)或BiOBr相比,BiOBr/α-Bi_(2)O_(3)异质结复合物表现出更优的可见光下催化降解环丙沙星(CIP)和灭活大肠杆菌(E.coli)的性能,其中BOB/BO-3具有最优的光催化活性,60min时CIP的降解率可达86.8%,其反应速率常数为α-Bi_(2)O_(3)和BiOBr的12.8倍和4.0倍,100min可将菌液浓度为1×10^(7)cfu/mL的E.coli全部灭活。基于匹配的能带结构、良好的异质结界面和高效的光生载流子分离,BiOBr/α-Bi_(2)O_(3)异质结复合物展现出优异的光催化性能,空穴(h+)和羟基自由基(·OH)是氧化降解CIP和破坏E.coli细胞的主要活性基团。
BiOBr/α-Bi_(2)O_(3)heterojunction composites were constructed by in-situ precipitation method,and BiOBr nanosheets were tightly assembled on the surface ofα-Bi_(2)O_(3)microrods.Compared withα-Bi_(2)O_(3)or BiOBr,BiOBr/α-Bi_(2)O_(3)heterojunction composites exhibited superior performance for the photocatalytic degradation of ciprofloxacin(CIP)and inactivation of E.coli under visible light.Among them,BOB/BO-3 displayed the optimal photocatalytic activity,achieving a CIP degradation rate of 86.8%at 60 min,and the reaction rate constants were 12.8 and 4.0 times higher than those ofα-Bi_(2)O_(3)and BiOBr.In addition,1×10^(7)cfu/mL E.coli were all inactivated by BOB/BO-3 at 100min.Based on the matched band structure,good heterojunction interface and efficient photogenerated carrier separation,BiOBr/α-Bi_(2)O_(3)heterojunction composites exhibited excellent photocatalytic performance.Hole(h+)and hydroxyl radical(·OH)were the main oxidizing active groups for the degradation of CIP and the destruction of E.coli cells.
作者
李娟
高亚辉
吴春来
窦宝宝
张毅博
张梦琪
Li Juan;Gao Yahui;Wu Chunlai;Dou Baobao;Zhang Yibo;Zhang Mengqi(School of Life Sciences and Health Engineering,Luoyang Institute of Science and Technology,Luoyang 471023)
出处
《化工新型材料》
北大核心
2025年第9期204-210,共7页
New Chemical Materials
基金
河南省科技攻关项目(242102231001,232102320080)。
作者简介
李娟(1980-),女,副教授,主要从事光催化材料的制备及应用研究,E-mail:lijuan-ly@163.com。
