四氯化钛水解法制备纳米氧化钛超细粉体

研究了改变溶液的酸碱度来控制ＴｉＣｌ４水解，制备锐钛上超细ＴｉＯ２纳米粉体的过程，采用ＸＲＤ，ＴＥＭ、ＳＡＥＤ和ＴＧ－ＤＴＡ等方法对所得粉体进行了表征，发现水解后的沉淀经真空干燥后，不用任何热处理，室温下即有锐钛矿相存在，其原始粒径约为３．８ｎｍ，粉体于４００℃煅烧２ｈ，可得到平均粒径为７ｎｍ的纯钛矿相纳米氧化钛粉体。

Preparation of Nanosized TiO2 Powders from Hydrolysis of TiCl4

By controlling the hydrolysis of titanium tetrachloride with adding (NH4)2SO4 andNH4OH, the preparation process of superfine titania powder was investigated. As-prepared powders were characterized by XRD,TEM, SAEDand TG-DTA techniques. Both XRD and SAEDresults showed that anatase phase existed in the sample dried at room temperature under vacuumand its primary particle size was about 3.sum. When calcined at 400'C for 2h, it was the singleanatase phase of titania and its primary particle size increased to 6.8um, but rutile phase occurredat the temperature over 700"C for 2h.