Enhanced Charge Separation of a-Bi2O3-BiOI Hollow Nanotube for Photodegradation Antibiotic Under Visible Light  

作　　者：ZHANG Pengfei LIU Huan LIANG Haiou BAI Jie LI Chunping 

机构地区：[1]Chemical Engineering College,Inner Mongolia University of Technology,Hohhot 010051,P.R.China [2]Inner Mongolia Key Laboratory of Industrial Catalysis,Hohhot 010051,P.R.China

出　　处：《Chemical Research in Chinese Universities》2020年第6期1227-1233,共7页高等学校化学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.21766022).

摘　　要：It is highly desirable to exploit semiconductor materials with high photocatalytic degradation activity,es-pecially bismuth oxyhalide semiconductor photocatalysts with special layered structure and suitable bandgap width.The low utilization rate of visible light and high recombination rate of photogenerated electron-hole of BiOl photo catalyst severely restrict its development.Herein,a heterojunction photocatalyst of a-Bi2O3-BiOI hollow nanotube was prepared by electrospinning method,solvothermal method and ion-exchange method.The a-Bi2O3-BiOI(BB-4 the stirring time of Bi2O3 in KI solution was 4 h)exhibited the best photocatalytic performance towards degrading the tetracycline hydrochloride(TC)solution,which could remove 85%of TC(10 mg/L)in 2 h under visible light irradia-tion.The estimated hrc of a-BiO-BiOI(BB-4)was ca.3.9 and 1.8 times as much as that of a-Bi2O3 and pure BiOI respectively.It indicated that the formation of a-BizO3-BiOl heterojunction can significantly improve the separatior efficiency of photogenerated electron-hole pairs,therefore the photocatalytic ability was enhanced.Furthermore,a corresponding photocatalytic mechanism was proposed that Oz radical and holes are the main active components in the photodegradation through trapping experiment.

关 键 词：BiOI BI2O3 HETEROJUNCTION Electrons-holes separation PHOTODEGRADATION 

分 类 号：O64[理学—物理化学]