化工新型材料

化工新型材料 ›› 2023, Vol. 51 ›› Issue (5) : 299-305. DOI: 10.19817/j.cnki.issn1006-3536.2023.05.056

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PbS量子点修饰中空CeO₂复合微球及光催化降解罗丹明B性能研究

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Photocatalytic degradation performance of rhodamine B by PbS quantum dot-modified hollow CeO₂ composite microspheres

Wang Boyuan, Cai Chengshi, Zong Yichao, Yuan Jun, Zhang Fuqing

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Received		Published
2021-12-30		2023-05-20
Issue Date	Revised Date
2023-05-31	2021-12-30

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摘要

制备了PbS量子点(PbSQDs)修饰的中空CeO₂微球(PbS@h-CeO₂)。通过SEM、(TEM、XRD和XPS测试复合材料的形貌和结构,通过UV-Vis、电化学和稳态荧光测试其光电性能。结果发现,复合材料为直径约700～800nm的中空纳米微球。对复合材料进行光催化降解RhB的性能测试表明,PbS@h-CeO₂-30在30min暗吸附和150min可见光照条件下可去除78.4%的RhB,同样条件下h-CeO₂只能去除37%的RhB。结果表明,引入PbSQDs修饰h-CeO₂后,通过量子点调节光的吸收范围,提高光生电子-空穴的分离效率,从而提高光催化性能。最后推导出其催化增强机理。

Abstract

PbS quantum dots (PbSQDs)-modified hollow CeO₂ microspheres (PbS@h-CeO₂) were synthesized.The morphology and structure of the composites (PbS@h-CeO₂) were tested by SEM,TEM,XRD and XPS,and the photoelectronic properties were tested by UV-Vis,EIS,MS and PL test.The SEM and TEM tests showed that the composites were regular hollow microspheres with diameters of about 700～800nm.The photocatalytic degradation performance of RhB by the composites was tested and it was found that PbS@h-CeO₂-30 could remove 78.3% of RhB under dark adsorption for 30min and visible light irradiation for 150min,while h-CeO₂ could only remove 37% of RhB under the same conditions.The results indicated that after the introduction of PbSQDs to modify h-CeO₂,the separation efficiency of photo-generated electrons and holes was improved by adjusting the light absorption range through quantum dots,thereby enhancing the photocatalytic performance.Finally,its photocatalytic enhancement mechanism was deduced.

关键词

二氧化铈 / PbS量子点 / 中空微球 / 光催化降解

Key words

CeO₂ / PbS quantum dots / hollow microspheres / photocatalytic degradation

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PbS量子点修饰中空CeO₂复合微球及光催化降解罗丹明B性能研究[J]. 化工新型材料, 2023, 51(5): 299-305 DOI:10.19817/j.cnki.issn1006-3536.2023.05.056

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