The g-C3N4/BiOI/CdS double Z-scheme heterojunction photocatalyst with I3-/I-redox pairs is prepared using simple calcination,sol-vothermal,and solution chemical deposition methods.The photocatalyst comprised mesoporous,thin g-C3N4 nanosheets loaded on flower-like microspheres of BiOI with CdS quantum dots.The g-C3N4/BiOI/CdS double Z-scheme heterojunction has abundant active sites and in situ redox I3/I-mediators and shows quantum size effects,which are all conducive to enhancing the separation of photoinduced charges and increasing the photocatalytic degradation efficiency for bisphenol A,a model pollutant.Specifically,the heterojunction photocatalyst achieves a photocatalytic degradation efficiency for bisphenol A of 98.62％in 120 min and photocatalytic hydrogen production of 863.44 μmol h-1g-1 on exposure to visible light.The excellent visible-light photocatalytic performance is as a result of the Z-scheme heterojunction,which extends absorption to the visible light region,as well as the I3/I-pairs,which accelerate photoinduced charge carrier transfer and separation,thus dramatically boosting the photocatalytic performance.In addition,the key role of the charge transfer across the indirect Z-scheme heterojunction has been elucidated and the transfer mechanism is confirmed based on the detection of intermediate I3 ions.Thus,this study provides guidelines for the design of indirect Z-scheme heterojunction photocatalysts.

College of Resource and Environmental Science,Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory,Wuhan University,Wuhan,430072,China;Jiangxi Provincial Key Laboratory of Water Resources and Environment of Poyang Lake,Jiangxi Institute of Water Sciences,Nanchang,Jiangxi,330029,China;Department of Environmental Science,School of Chemistry and Materials Science,Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education of the People's Republic of China,Heilongjiang University Harbin,150080,China

[1]Yan Zhang;Yixiao Wu;Liang Wan;Wenfeng Yang;Huijun Ding;Chongyang Lu;Weihao Zhang;Zipeng Xing-.Double Z-Scheme g-C3N4/BiOI/CdS heterojunction with I3/I-pairs for enhanced visible light photocatalytic performance)[J].绿色能源与环境（英文）,2022(06):1377-1389

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