Cd空位缺陷的CdS光催化降解罗丹明B

吴用; 姚庆

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中国环境科学 ›› 2024, Vol. 44 ›› Issue (8) : 4347-4354.

水污染与控制

Cd空位缺陷的CdS光催化降解罗丹明B

吴用¹, 姚庆²

作者信息 +

Photocatalytic degradation of RhB by CdS with Cd vacancy defects

WU Yong¹, YAO Qing²

Author information +

文章历史 +

摘要

为提高CdS光催化降解性能,通过水热法合成了具有Cd空位缺陷的Cd_1-xS,并将其应用于光催化降解罗丹明B(RhB).结果表明,可见光照射下反应40min后,Cd_1-xS对RhB的光降解率达到98.1%,降解速率常数k = 0.08649min^-1,光催化活性远高于CdS.自由基淬灭实验结果表明,·O₂^-为Cd_1-xS光催化降解RhB的主要活性物种.UV-vis、XPS、EPR表征结果表明,Cd空位的引入拓宽了Cd_1-xS的带隙宽度,抑制了可见光的吸收,证明了Cd_1-xS活性的提升并非源于能带结构的改变.密度泛函理论计算结合PL表征表明,Cd空位的引入导致了CdS局域电子密度不对称,促进空穴传输和载流子分离,从而显著提高了Cd_1-xS的光催化活性.

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.

导出引用

吴用, 姚庆. Cd空位缺陷的CdS光催化降解罗丹明B[J]. 中国环境科学. 2024, 44(8): 4347-4354

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

中图分类号： X703.5

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