溶胶凝胶法制备TiO2实验条件的考察

实验以钛酸正丁酯为前驱体，采用溶胶凝胶法制备二氧化钛。设计正交试验，考察水、乙醇、冰醋酸、pH值和凝胶温度对凝胶时间和状态的影响。对凝胶时间的影响程度依次为：pH值、乙醇量、凝胶温度、冰醋酸量、水量。确定溶胶凝胶法合成二氧化钛最佳条件为：pH值为2-3、乙醇的量22～28mL、凝胶温度为55～65℃、冰醋酸的量1．75～2．5mL、水的量2．0～2．5mL。

The Conditions for Preparing Titanium Dioxide by Sol-gel Method

The titanium dioxide was prepared by sol-gel method with using tetra-n-butyl titanate as precursor.The effects of the amount of ethanol,water and acetic acid,pH value and gelation temperature on gelation time were investigated by orthogonal experiment.The results showed that the order of the influencing factors on gelation time was pH value,amount of ethanol,gelation temperature,amount of acetic acid and water.The best experimental conditions for preparing titanium dioxide by sol-gel method were that pH value was 2~3,ethanol was 22~28mL,the gelation temperature was 55~65℃,the amount of acetic acid was 1.75~2.5mL and the amount of water was 2.0~2.5mL.