摘要
用溶胶-凝胶法制备了Ho/Si/TiO2复合光催化剂,采用X射线衍射对样品进行分析表征,并以甲基橙为模拟污染物,考察其光催化活性。结果表明,Ho和Si共掺杂抑制了晶粒的长大,Ho掺杂引起晶格畸变和膨胀,促进TiO2的晶型转变;Ho/Si/TiO2复合光催化剂与TiO2相比,光催化活性明显提高,当焙烧温度为900℃,添加Ho的物质的量为0.05%时,光催化活性最佳。
Ho-Si-TiO2 composite photocatalysts were prepared by sol-gel method and characterized by XRD. Their photocatalytic activity was investigated via photocatalytic degradation of methyl orange. It was found that doping of Ho and Si together restrained growth of the grains; doping of Ho resulted in change and expansion of the crystal lattice and promoted the transformation from anatase to tutile. Ho-Si- TiO2 catalyst exhibited remarkably higher photocatalytic activity than TiO2. Optimal photocatalytic activity was obtained at calcination temperature of 900 ℃ and Ho doping of 0. 05% （mole）.
出处
《工业催化》
CAS
2008年第11期68-72,共5页
Industrial Catalysis
基金
国家自然科学基金资助项目(20776159)
