Cd空位缺陷的CdS光催化降解罗丹明B

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Abstract To enhance the photocatalytic degradation performance of CdS, Cd_1-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 Cd_1-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 Cd_1-xS. UV-DRS, XPS, and EPR characterization results demonstrated that the introduction of Cd vacancies widened the bandgap of Cd_1-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 Cd_1-xS.

Key words： Cd vacancy CdS charge separation photocatalytic degradation RhB

Received: 17 January 2024

PACS:

X703.5

Corresponding Authors: 吴用,高级工程师,jczwuy@126.com E-mail: jczwuy@126.com

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	WU Yong
	YAO Qing

Cite this article:

WU Yong,YAO Qing. Photocatalytic degradation of RhB by CdS with Cd vacancy defects[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4347-4354.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I8/4347

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