摘要：通过溶胶 -凝胶工艺制备了锐钛矿型TiO₂ 纳米粉体,TiO₂ 粉体由 40～ 80nm的球形颗粒组成。XPS研究表明 :TiO₂纳米粉体中主要含有Ti和O元素 ,未发现其它杂质元素 ,O/Ti的原子比为 2 .14,其中含有一定量的羟基 (-OH)。甲基橙水溶液的光催化降解实验表明 :溶胶 -凝胶工艺制备的锐钛矿型TiO₂纳米粉体的光催化活性明显高于普通TiO₂粉体。

关键词：溶胶-凝胶工艺;二氧化钛纳米粉体;光催化特性;

Abstract：Anatase TiO₂  nanometer powder is prepared by sol－gel method．TiO₂  powder is composed of TiO₂  sphere particles in size of 40～80nm．XPS studies show that besides Ti and O elements in the powders‚there is no other impurities，O／Ti（in molar ratio） is 2．14 and there is a certain amount of hydroxyl groups in powders．Photocatalytic degradation of methyl orange aqueous solution indicates that photocatalytic activity of ths sol －gel derived TiO₂ nanometer powder is obviously higher than that of common TiO₂  powder．

Key words：sol－gel method；TiO₂ nanometer powder；photo catalytic activity