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中文摘要：
以H2S和Na2S为硫源,通过共沉淀法制备了ZnS-CdS/SiO2复合光催化剂,利用高分辨透射电镜（HR-TEM）、X射线光电子能谱（XPS）、X射线衍射（XRD）等技术对催化剂进行了表征.研究了Na2S及H2S为硫源时催化剂表面结构和可见光下光催化还原水产氢的活性的变化.结果表明,与H2S相比,Na2S为硫源更有利于ZnS-CdS在SiO2上的担载,且构成了以ZnS为外层,CdS为内层的表面结构.此种表面结构不仅随硫源不同变化,也随制备时体系pH的变化而发生变化.ZnS-CdS的负载量与产氢活性密切相关,并随负载量的变化出现一最大值.制备溶液pH值升高,导致负载ZnS-CdS与与载体之间的相互作用增强,催化剂产氢活性增加.
英文摘要：
ZnS-CdS/SiO2 photocatalysts were prepared by co-precipitation method using Na2S and H2S as sulfur source respectively.The resulting photocatalysts were characterized by HRTEM,XPS,and XRD techniques.The effects of sulfur sources on the surface structure of photocatalysts and their photocatalytic activities for H2 production were investigated.Results showed that the ZnS-CdS can deposit efficiently on SiO2 when Na2S was used as a sulfur source.That catalyst exhibited a surface structure with a CdS core and ZnS shell.The surface structure and component concentration were dependent on pH values of solution.The loading amounts of ZnS-CdS showed significantly influence on the activities.When H2S was used for preparing photocatalysts,the interaction between ZnS-CdS and SiO2 increased with the increase of pH values of solution,which promoted the activity for hydrogen generation.
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