利用渗透膜使TiCl4溶液中H+和Cl-慢慢渗透出来而水解得到凝胶,然后用有机溶剂置换出其中的水分而干燥,焙烧后即得纳米TiO2.采用TEM、XRD、氮气吸脱附实验对样品进行了表征和分析.所得产品颗粒细小、均匀,比表面积大.晶体相转变温度高,700℃焙烧仍然为锐态矿型晶体,900℃转变为金红石型晶体.文中还将该法和加热水解法、氨水沉淀法以及钛酸丁酯溶胶-凝胶法进行了比较.
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