光还原法制备花状Bi/CuS可见光催化剂及其性能研究  

Preparation of Flower-Like Bi/CuS Photocatalyst by Photo-Reduction Method

作　　者：王蕾 宋欣怡 童海健 霍宇凝[1] Wang Lei;Song Xinyi;Tong Haijian;Huo Yuning(Department of Chemistry,Shanghai Normal University,Shanghai 200234,China)

机构地区：[1]上海师范大学化学系,上海200234

出　　处：《稀有金属》2023年第1期177-185,共9页Chinese Journal of Rare Metals

基　　金：上海市自然科学基金项目(20ZR1440700)资助。

摘　　要：为了提升CuS材料的光催化活性用来有效降解染料废水中的有机污染物,使用金属修饰法对其进行改良。以氯化铜、硫脲和DMF溶剂等为原料,通过溶剂热法合成花状CuS材料。之后利用光还原法将金属Bi负载到CuS催化剂的表面,制备出Bi/CuS光催化复合材料。通过X射线衍射仪(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)等对复合材料进行表征,并以刚果红(CR)为目标降解物进行可见光催化活性研究。结果显示,用光还原法制备的Bi/CuS光催化剂始终保持球状结构,Bi元素均匀分布在其中。引入Bi可促进CuS的光吸收性能,能够有效地抑制电子空穴的复合,有利于光生载流子的分离,大大提升CuS对CR溶液的光催化降解性能。同时金属Bi在CuS催化剂上的负载量受光照还原时间的影响。当光照还原时间为45 min时合成的Bi/CuS光催化剂活性最佳,对CR的降解率可达到89.5%。此方法运用范围广泛、无二次污染,为快速降解CR溶液提供了一定的参考。Congo Red(CR), as one of azo dyes, is widely used in production because of its easy solubility in water, low cost and good dyeing effect. Traditional methods to degrade Congo red include microwave treatment, electrochemical catalysis, adsorption, and etc. However, photocatalytic technology, which uses solar energy to degrade organic pollutants and reduce carbon dioxide, presents the advantages of simplicity and no secondary pollution. It has raised the wide research of dye wastewater treatment in recent years.Among them, CuS, as a p-type semiconductor material, has the characteristics of low cost and high stability compared with other photocatalysts. Flower-shaped CuS can improve the photocatalytic efficiency by more efficient utilization of solar energy. However, CuS needs to be modified for some defects, such as easy electron-hole combination. Metal modification is one of the important ways to improve the photocatalytic activity. The existing form and content of doped metal have an important influence on the recombination of photo-generated electrons and holes, and then affect its photocatalytic activity. As a dopant, Bi has attracted much attention because of its high electron transfer efficiency, low cost and easy availability. In this study, the flower-shaped CuS material was synthesized by solvothermal method with copper chloride, thiourea and N,N-dimethylformamide as raw materials. Bi/CuS composite was prepared by photo-reduction method, and metal Bi was loaded on the surface of CuS catalyst. X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM) and Zeta potential diagram were used to characterize the catalyst. The results showed that the crystallinity and purity of CuS were high, and metal Bi was successfully loaded on the surface of CuS catalyst. The prepared CuS had flower-ball/hedgehog-like morphology and good dispersibility. The spherical structure of Bi/CuS was maintained. In the optimized Bi/CuS(45) example, it could be seen that Bi elements were uniformly

关 键 词：Bi/CuS光催化剂 光还原法 可见光催化降解 刚果红(CR)溶液 

分 类 号：O643.36[理学—物理化学]