Efficient interfacial charge transfer of BiOCl-In_(2)O_(3) step-scheme heterojunction for boosted photocatalytic degradation of ciprofloxacin  

作　　者：Kaiqiang Xu Jie Shen Shiying Zhang Difa Xu Xiaohua Chen 

机构地区：[1]College of Materials Science and Engineering,Hunan University,Changsha 410082,China [2]Hunan Key Laboratory of Applied Environmental Photocatalysis,Changsha University,Changsha 410005,China

出　　处：《Journal of Materials Science & Technology》2022年第26期236-244,共9页材料科学技术（英文版）

基　　金：the National Nature Science Foundation of China(No.21871030,52174238);Hunan Provincial Natural Science Foundation of China(No.2020JJ4644,2018JJ2456);the Research Foundation of Education Bureau of Hunan Provincial(No.19A053,19B062)。

摘　　要：BiOCl as a representative layered bismuth-based photocatalyst with Sillén-structure has aroused wide public concern on photocatalytic degradation.However,the photocatalytic efficiency of pristine BiOCl is currently restricted by its low optical absorption and charge separation efficiency.Herein,step-scheme(S-scheme)heterojunctions of In_(2)O_(3) nanoparticle and BiOCl micron-sheet were constructed by a convenient molten salt method by using a LiNO_(3)-KNO_(3) system.The In_(2)O_(3)-BiOCl heterojunctions exhibit higher optical absorption performance from 380 nm to 700 nm than the pristine BiOCl and enhanced photocatalytic property toward ciprofloxacin(CIP)degradation under Xenon lamp illumination.The sample 20%In_(2)O_(3) -BiOCl showed the highest photodegradation efficiency,attaining 91%removal of CIP within 35 min,which was 39.6 times and 3.2 times higher than that of pristine In_(2)O_(3) and BiOCl,respectively.The improved photodegradation property mainly resulted from the novel S-scheme mechanism,which boosted highly efficient separation of the photo-induced carriers.The photoluminescence spectrometric test and transient photocurrent response results demonstrated that In_(2)O_(3)-BiOCl composite exhibited efficient separation of photo-generated charge carriers.This work would provide new insights into the design of novel S-scheme photocatalytic systems with applicability in photocatalytic water treatment.

关 键 词：Step-scheme photocatalyst In_(2)O_(3) BiOCl Photocatalytic activity CIPROFLOXACIN 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]