乙二醇-硫脲低共熔溶剂合成CdS光催化剂及其光催化性能研究

Synthesis of CdS photocatalyst from ethylene glycol-thiourea deep eutectic solvent and its photocatalytic properties

针对目前水污染严重的问题,采用CdS光催化剂降解有机污染物受到了越来越多的关注。采用乙二醇-硫脲低共熔溶剂作为反应溶液,在120℃下合成了CdS光催化剂,改善了传统水热法高温高压的反应条件。利用XRD等测试分析方法对CdS的结构、形貌以及光学特性进行了表征分析。结果表明,合成的CdS光催化剂为六方相CdS,形貌为颗粒状,粒径明显小于100 nm,聚集程度较高。光吸收波长主要在200~450 nm,在620 nm处表现出最强PL发光特征峰。光催化试验结果表明,在CdS光催化剂作用下光照75 min后亚甲基蓝溶液降解率在90%以上。

Aming at the current serious water pollution problem,CdS photocatalyst has received more and more attention.The CdS photocatalyst is successfully synthesized using ethylene glycol-thiourea deep eutectic solvent as the reaction solution at 120℃,improving the reaction conditions of traditional hydrothermal methods at high temperature and pressure.The structure,morphology,and optical properties of CdS are characterized by XRD and other analytical methods.The results show that the synthesized CdS is hexagonal CdS,the morphology is granular,the particle size is obviously less than 100 nm,and the aggregation degree is high.The light absorption wavelength is mainly 200-450 nm,and the strongest PL emission characteristic peak is exhibited at 620 nm.The photocatalytic experiment show that the degradation rate of methylene blue solution is over 90%after 75 min of illumination under the action of CdS photocatalyst.