四氯化钛水解法制备TiO_2及光催化性能的研究

Preparation and photocatalytic activity of TiO_2 by hydrolysis of titanium tetrachloride

实验以无机盐四氯化钛为原料,采用水解法用硫酸铵修饰四氯化钛溶液制得二氧化钛粉末。以甲基蓝模拟废水中的有机污染物,考察了硫酸铵的用量、水解温度、不同溶剂、锻烧温度以及硫酸根离子对光催化降解能力的影响,并对其机理进行了分析。得到了二氧化钛粉末适宜的制备工艺条件,降解甲基蓝120 min,当四氯化钛与硫酸铵的物质的量摩尔比为1∶2时光催化降解率达到83%、水解温度为90℃时光催化降解率达到87%、用无水乙醇溶剂进行清洗时光催化降解率达到80%、锻烧温度在500℃条件下光催化降解率达到85%。因此,采用水解法制备二氧化钛粉末最佳反应条件为:四氯化钛与硫酸铵的物质的量摩尔比为1∶2、水解温度为90℃、用无水乙醇溶剂进行清洗、锻烧温度在500℃。

Titanium tetrachloride with inorganic salts as raw materials in the experiment,TiO2 was prepared by the hydrolyzation method in（NH4）2SO4-modified TiCl4 solution,The photocatalytic activity to a number of different types of catalysts were investigated using methyl blue as the organic in wastewater,Considering these factors such as the amount of ammoonium sulfate、water-bath temperature、different solvents、calcination temperature and SO42-,which affect the ability of photocatalytic degradation,the mechanism was analyzed.We came to optimal conditions of preparing TiO2 powder i.e.Degradation of methylene blue for 120 minutes,when the mole ratio of TiCl4∶（NH4）2SO4=1∶2,the degradation rate was 83%;when the water-bath temperature of 90 ℃,the degradation rate was 87%;when cleaning solvent with ethanol,the degradation rate was 80%;when the calcination temperature of 500 ℃,the degradation rate was 85%.So the best conditions of preparing TiO2 powder were that the mole ratio of TiCl4∶（NH4）2SO4=1∶2,the water-bath temperature of 90 ℃,cleaning solvent with ethanol and the calcination temperature of 500 ℃.