作　　者： ; ; (党鸿辛）; (毛立群）;

机构地区： 中国科学院兰州化学物理研究所固体润滑国家重点实验室

出　　处： 《化学研究》 2004年第2期1-5,共5页

摘　　要： 以丙烯酸修饰的钛酸丁酯为前躯体,采用溶胶 凝胶法制备纳晶TiO2.用XRD,TEM,BET以及TG DTA考察了热处理温度对纳晶TiO2微结构的影响.测试结果表明,热处理温度对样品的微结构以及光催化活性有很大的影响.采用溶胶 凝胶法制备纳晶TiO2的最佳焙烧温度范围为400～600℃,低于400℃样品中的有机成分难以彻底消除且样品的结晶度不高;高于600℃,TiO2颗粒存在明显的热团聚,使晶粒尺度变大,粒径分布不均以及比表面积显著降低,这些因素都会造成样品活性降低. Nanocrystalline TiO_(2) was prepared by sol-gel method with tetrabutyl titanate modified by acrylic acid. The effects of heat treatment on microstructure were examined using XRD, TEM, BET and TG-DTA. The experimental results indicate that heat treatment significantly affects both microstructure and photoactivity. Results show that there is a relationship between microstructure and photoactivity. Heat treatment of the sample at temperature higher than 400 ℃ is essential for removal of organic components and to acquire perfect nanocrystalline TiO_(2). As roasting temperature is up to 600 ℃, the particle size and rutile content increase with increasing roasting temperature, which results in decrease of photoactivity. The proper roasting temperature is about 400～600 ℃ and the samples prepared in this range have high photocatalytic activity in degradation of brilliant red X-3B.

关 键 词： 热处理温度 纳晶二氧化钛 微结构 光催化活性 溶胶 凝胶法

领　　域： [理学] [理学] [一般工业技术]