Abstract
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.
基金项目
National Natural Science Foundation of China(52000011)
National Natural Science Foundation of China(62274017)
National Natural Science Foundation of China(51808250)
Natural Science Foundation of Jiangsu Province of China(BK20210041)
Hong Kong Scholars Program 2017()
NETL
NSTL
万方数据