凝胶限域制备CdS/SiO2及其光催化产氢性能研究

利用凝胶限域—阴离子交换法制备了CdS/SiO2复合材料,采用XRD、SEM、HRTEM、BET、UV-vis和GC对其结构、物性及可见光催化产氢性能进行了表征,并与水热法及常温沉淀法制备的CdS纳米粒子进行了性能比较。结果表明,利用SiO2凝胶限域制备的CdS粒径为3~7 nm,CdS/SiO2比表面积可达68.99 m^2/g,其吸收带边红移至605 nm。在无助催化剂的条件下,CdS/SiO2的光催化产氢速率达到1925.29μmol/(h·g),分别为水热法及常温沉淀法的47倍和2.3倍,且光催化循环稳定性更优。

Study on Gel Confined Preparation and Photocatalytic Hydrogen Production Performance of CdS/SiO2

CdS/SiO2 composites were prepared by gel confined-anion exchange method.Structures,physical properties and visible light photocatalytic hydrogen production properties of CdS/SiO2 composites were characterized by XRD,SEM,HRTEM,BET,UV-vis and GC.Properties of cadmium sulfide nanoparticles prepared by hydrothermal and precipitation method at room temperature were compared.The results show that CdS size prepared by silica gel confined is 3-7 nm,specific surface area of CdS/SiO2 is 68.99 m^2/g,and absorption band edge red shifts to 605 nm.In absence of catalyst,photocatalytic hydrogen production rate of CdS/SiO2 is 1925.29μmol/(h·g),which is 47 and 2.3 times than those of hydrothermal and precipitation method room temperature,respectively,and photocatalytic cycle of CdS/SiO2 is more stable.