Insights into photocatalytic mechanism over a novel Cu2WS4/MoS2 S-scheme heterojunction

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外文摘要：A novel efficient Cu2WS4/MoS2 step-scheme(S-scheme)heterojunction photocatalyst was constructed for the first time and applied in the removal of environ-mental pollutants.Among the as-prepared photocatalysts,the Cu2WS4/MoS2-8％heterojunction photocatalyst demonstrates the optimal photocatalytic performance,with the catalytic oxidation efficiency of tetracycline(TC)and the catalytic reduction efficiency of Cr6+reaching 93.3％and 82.1％,respectively.The excellent catalytic properties of Cu2WS4/MoS2 heterojunction photocatalysts are attrib-uted to the effective separation pathways of charges and the presence of S-scheme heterojunctions,together with stronger redox capabilities.It is speculated that the pho-togenerated carrier migration path of the Cu2WS4/MoS2 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 photocat-alytic mechanism of S-scheme photogenerated carrier migration for the Cu2WS4/MoS2 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 solar-energy conversion.

外文关键词：

Cu2WS4/MoS2S-schemeHeterojunctionPhotocatalysis

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

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作者单位：

School of Materials Engineering,Jiangsu Key Laboratory of Advanced Functional Materials,School of Electronic and Information Engineering,Changshu Institute of Technology,Changshu 215500,China

School of Chemistry and Chemical Engineering,Changji University,Changji 831100,China

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

School of Environment,Jiangsu Engineering Lab of Water and Soil Eco-Remediation,Nanjing Normal University,Nanjing 210023,China

Department of Chemical Engineering,Curtin University,Perth,WA 6845,Australia

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangsu Province of ChinaHong Kong Scholars Program 2017

项目编号：

520000116227401751808250BK20210041

出版年：

2024

DOI：

10.1007/s12598-024-02653-5

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDEI

影响因子：0.801

ISSN：1001-0521

年,卷(期)：2024.43(7)

参考文献量2