Fabrication of Z-Scheme WO3/KNbO3 Photocatalyst with Enhanced Separation of Charge Carriers  

作　　者：ZHENG Xiuzhen HAN Huijuan YE Xiangju MENG Sugang ZHAO Shuangshuang WANG Xiangxiang CHEN Shifu 

机构地区：[1]College of Chemistry and Materials Science,Huaibei Notmal University,Huaihei 235000,P.R.China [2]State Key Laboratory of Photocatalysis on Energy and Environment,Fuzhou University,Fuzhou 350116,P.R.China [3]College of Chemistry and Material Engineering,Anhui Science and Technology University,Fengyang 233100,P.R.China

出　　处：《Chemical Research in Chinese Universities》2020年第5期901-907,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(Nos.51472005,51772118 and 21607027);the Natural Science Foundation of Anhui Province,China(No.1608085QB37);the Open Project Program of the State Key Laboratory of Photocatalysis on Energy and Environment,Fuzhou University,China(No.SKLPEE-KF201804);the Natural Science Foundation of Educational Conunittee of Anhui Province,China(Nos.KJ2018A0387 and KJ2019A0601);the Project of Aiiliui Province tor Excellent Young Talents in Universities,Cliina(No.gxyq2019029);the Graduate Innovation Foundation of Huaibei Nonnal University,China(No.ycx201901003)。

摘　　要：Z-Schemc photocatalysts as a research locus pertomi strong redox capability and high photocatalytic peribnnance.WO3/KNbO3 photocatalysts were fabricated by ball milling method,and performed higlier photocatalytic activity in liquid degradation(rhodamine B,methylene blue and bisphenol A),compared with WO3 or KNbO3 monomer.This is due to that Z-scheme heterojunction is lonned between WO3 and KNbO3,and the holes photo-excited in valence band of KNbO?are quickly combined with the electrons in conduction band of WO3.The electrons accumulated in conduction band of KNbO3 show high reducibility,thereby reducing O2 to·O 2-,and the holes in valence band of WO3 show high oxidative to oxidize H2O to·OH,respectively.Furthermore,it is proved by means of electron spin resonaiice(ESR)spectra,terephthalic acid photolumiiiescence probing technique(TA・PL),and UV-Vis absorption spectra of nitroblue tetrazolium.This work indicates that the iabrication of Z-scheme structure can improve the photocatalytic activity by efficiently separating the photogenerated electrons and holes in the photocatalytic reaction system,which is helpful to deeply understand the migration mechanism of photoexcited cairier(band-band transfer and Z-scheme transfer)in heterojunction photocatalysts.

关 键 词：WO3/KNbO3- Z-Scheme Photogenerated electron and hole Photocatalytic degradation Active species 

分 类 号：O64[理学—物理化学]