Abstract: Pure titanium dioxide photocatalysts were synthesized by controllable hydrolyzation from titanium tetrachloride. Effects of preparation conditions on catalytic activity were investigated，such as pH，temperature and concentration. The obtained titania particles were characterized by transmission electron microscopy（TEM）and X-ray diffractometry（XRD）. Results indicated the obtained titania with anatase phase and an average particle size of about 13nm showed excellent dispersion properties and catalytic activities when the pH value was controlled at 6，the system temperature at 15 ℃ and the volume ratio of titanium tetrachloride with ethyl alcohol at 1∶3 during the preparation process.

摘要： 以TiCl4为原料，采用可控水解法制备了TiO2光催化剂，探讨了体系的pH值、温度、浓度等对TiO2催化活性的影响，并通过XRD和TEM对优化条件下制备的产品的晶型和形貌做了表征。结果表明：当溶液pH值为6、体系温度在15 ℃、四氯化钛和乙醇的体积比为1︰3时，得到的TiO2为锐钛矿型，平均粒径在13nm左右，且分散性能好、催化活性高。