Insights into photocatalytic mechanism over a novel Cu_(2)WS_(4)/MoS_(2) S-scheme heterojunction  

作　　者：Wei Zhao Ji-Hui Cao Jun-Jie Liao Yun Liu Xiao-Jun Zeng Jun-Yu Shen Xue-Kun Hong Yang Guo He-Hua Zeng Ya-Zi Liu 

机构地区：[1]School of Materials Engineering,Jiangsu Key Laboratory of Advanced Functional Materials,School of Electronic and Information Engineering,Changshu Institute of Technology,Changshu215500,China [2]School of Chemistry and Chemical Engineering,Changji University,Changji 831100,China [3]State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control,Ministry of Ecology and Environment,Nanjing Institute of Environmental Sciences,Nanjing 210023,China [4]School of Environment,Jiangsu Engineering Lab of Water and Soil Eco-Remediation,Nanjing Normal University,Nanjing 210023,China [5]Department of Chemical Engineering,Curtin University,Perth,WA6845,Australia

出　　处：《Rare Metals》2024年第7期3118-3133,共16页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52000011,62274017 and 51808250);the Natural Science Foundation of Jiangsu Province of China(No.BK20210041);the Hong Kong Scholars Program 2017。

摘　　要：A novel efficient Cu_(2)WS_(4)/MoS_(2) step-scheme(S-scheme)heterojunction photocatalyst was constructed for the first time and applied in the removal of environmental pollutants.Among the as-prepared photocatalysts,the Cu_(2)WS_(4)/MoS_(2)-8%heterojunc tion photoc atalyst demonstrates the optimal photocatalytic performance,with the catalytic oxidation efficiency of tetracycline(TC)and the catalytic reduction efficiency of Cr^(6+)reaching 93.3%and 82.1%,respectively.The excellent catalytic properties of Cu_(2)WS_(4)/MoS_(2) heterojunction photocatalysts are attributed to the effective separation pathways of charges and the presence of S-scheme heterojunctions,together with stronger redox capabilities.It is speculated that the photogenerated carrier migration path of the Cu_(2)WS_(4)/MoS_(2) catalyst follows the typical S-scheme photocatalytic mechanism,which is verified by the in-depth experimental study and simulated calculations including the electron paramagnetic resonance(EPR)analysis,free radical quenching experiments,charge density distribution,and simulated built-in electric field formation at the interface,which acts as driving force to promote the separation of photoinduced electrons and holes.Finally,the photocatalytic mechanism of S-scheme photogenerated carrier migration for the Cu_(2)WS_(4)/MoS_(2) catalyst is revealed based on the systematic experimental techniques and simulated calculations,accounting for its superior photocatalytic oxidation and reduction activities.This study provides inspiring implications to develop high-efficient S-scheme photocatalytic systems for versatile applications in solarenergy conversion.

关 键 词：Cu_(2)WS_(4)/MoS_(2) S-scheme HETEROJUNCTION PHOTOCATALYSIS 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]