Microwave-assisted synthesis of pectin-stabilised CdS/ZnS core/shell nanocrystals and enhanced photocatalytic performance

Micro & nano letters

article

Dezhi Qin¹  Guangrui Yang²  Yabo Wang¹  Jiajia Zhang¹  Li Zhang¹ 

[1] College of Chemistry and Environmental Engineering, Pingdingshan University;Institute of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power

关键词: zinc compounds;    II-VI semiconductors;    nanostructured materials;    visible spectra;    nanofabrication;    aggregation;    ultraviolet spectra;    cadmium compounds;    wide band gap semiconductors;    photocatalysis;    photocatalysts;    surface chemistry;    core-shell nanostructures;    microwave materials processing;    thermal analysis;    dyes;    wastewater treatment;    red shift;    pectin molecules;    microwave-assisted synthesis;    pectin-stabilised CdS-ZnS core-shell nanocrystals;    enhanced photocatalytic performance;    cubic phase;    long-chain structure;    aggregation;    thermogravimetric analysis;    inorganic–organic hybrid materials;    ultraviolet–visible spectra;    red-shift;    photocatalytic activity;    Rhodamine B degradation;    visible light irradiation;    photo-dissolution;    photo-corrosion;    photocatalytic stability;    CdS-ZnS;   

DOI  :  10.1049/mnl.2020.0062

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Pectin-conjugated CdS/ZnS core/shell nanocrystals were prepared by using a microwave-assisted approach without the addition of any external ligands. The prepared cubic phase CdS/ZnS nanocrystals were uniform and mono-dispersed with sizes of 6–9 nm. The charge and long-chain structure of pectin molecules effectively prevented the aggregation of CdS/ZnS nanocrystals. In addition, pectin molecules have multiple functional groups, such as O–H, C=O, and COO − , which could conjugate with the surface of samples to control the growth of CdS/ZnS nanocrystals. Thermogravimetric analysis provided evidence that the obtained products are inorganic–organic hybrid materials. Based on the analysis of ultraviolet–visible spectra, it was found that the formation of ZnS shell led to a red-shift and an enhancement of absorption of CdS/ZnS nanocrystals compared with that of CdS. Photocatalytic activity of CdS/ZnS nanocrystals was monitored by the degradation of Rhodamine B under visible light irradiation. The presence of ZnS shell inhibited photo-corrosion and photo-dissolution of CdS nanocatalyst, thus resulting in a significant enhancement of photocatalytic activity and stability.

【 授权许可】

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