以钛酸四丁酯为原料，采用溶胶凝胶过程超临界干燥法制备了 Ｔｉ Ｏ２ 纳米粉体，并通过 Ｘ Ｒ Ｄ、 Ｂ Ｅ Ｔ、 Ｔ Ｅ Ｍ 等方法对所得样品进行表征． 制备的 Ｔｉ Ｏ２ 气凝胶具有很高的比表面积（４８８ ｍ ２ ·ｇ－ １），平均粒径为 ４．６ ｎｍ ，具有锐钛矿型晶体结构，经５００℃煅烧２ ｈ 所得的纳米粉体，锐钛矿型晶体结构更为明显，平均粒径６．７ ｎｍ ，比表面积 １５８ ｍ ２ ·ｇ－ １． 将它用于甲基橙溶液的脱色反应，具有高的光催化活性 Ti (superscript 2 +) is prepared by sol - gel process supercritical drying method using tetrabutyl titanate as raw material. The samples were characterized by XRD, B E T and T E M. The prepared Ti O2 airgel has a high specific surface area (488 m 2 · g -1) and an average particle size of 4.6 nm, and has an anatase crystal structure. After being calcined at 500 ° C. for 2 h, the obtained nano-powder The anatase crystal structure is more obvious with an average particle size of 6.7 nm and a specific surface area of ​​158 m 2 · g -1. It is used for methyl orange solution decolorization reaction, with high photocatalytic activity