纳米Ag@SiO_2/TiO_2复合光催化剂的制备及性能研究  

Preparation and property of Ag@SiO_2/TiO_2 nanocomposite photocatalyst

作　　者：杨克森[1] 谈发堂[1] 王维[1] 乔学亮[1] 陈建国[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《化工新型材料》2015年第2期47-49,共3页New Chemical Materials

基　　金：国家重点基础研究发展计划国家重点基础研究发展计划(2009CB939705);中央高校基本科研业务费专项资金资助(HUST:2012QN042)

摘　　要：利用改进的Stber法在银核表面包覆一层SiO2,制备核-壳结构Ag@SiO2,然后以钛酸丁酯为钛源,采用溶胶-凝胶法制备出Ag@SiO2/TiO2复合光催化剂。应用XRD、TEM,UV-Vis和荧光光谱仪对样品进行表征。以亚甲基蓝作为降解模型化合物,研究所制备Ag@SiO2/TiO2复合材料的光催化性能。结果表明,由于贵金属Ag的存在,大大提高了TiO2的光催化效率;而Ag@SiO2结构,使得Ag的等离子共振峰明显向长波方向移动,与TiO2复合后,拓宽了TiO2的光谱响应范围,从而提高对可见光的利用率。Ag@SiO2core-shell nanostructure was prepared using modified Stber method.Then Ag@SiO2/TiO2 was in-situ synthesized by sol-gel method,used tetra-n-butyl titanate as titanium source.The as-prepared samples were characterized with Xray diffraction（XRD）,transmission electron microscopy（TEM）,UV-Vis spectroscopy and fluorescence spectrophotometer.The degradation of methyl blue（MB）was used as the model reaction to investigated the photocatalytic property of the photocatalyst.The results showed that photocatalytic efficiency of TiO2 was improved greatly due to the presence of nano silver.In addition,the surface plasma absorption peak of silver moved to longer wavelengths after coating a layer of SiO2.So the photocatalyst broadened the spectral response range of TiO2 and increased the utilization rate of visible light.

关 键 词：Ag@SiO2 TIO2 亚甲基蓝 光催化 降解 

分 类 号：O643.36[理学—物理化学]