Photocatalytic degradation of RhB by CdS with Cd vacancy defects
To enhance the photocatalytic degradation performance of CdS,Cdi-xS with Cd vacancy defects was synthesized through a hydrothermal method and was applied to the photocatalytic degradation of Rhodamine B(RhB).The results showed that under visible-light irradiation for 40min,the photodegradation rate of RhB by Cd1-xS reached 98.1％,with a degradation rate constant k=0.08649min-1,which was significantly higher than that of CdS.The quenching experiments of free radicals indicated that·O2 is the main active species during the photocatalytic degradation of RhB by Cd1xS.UV-DRS,XPS,and EPR characterization results demonstrated that the introduction of Cd vacancies widened the bandgap of Cd1-xS to inhibit the absorption of visible light,and proved that the enhancement of the photocatalytic activity was not due to changes in the band structure.Density functional theory calculations combined with PL results revealed that the introduction of Cd vacancies led to an asymmetric local electron density in CdS to promote hole transport and charge carrier separation,thereby significantly enhancing the photocatalytic activity of Cd1-xS.
Cd vacancyCdScharge separationphotocatalytic degradationRhB
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维普
