掺钒TiO_2纳米粉体的制备及性能

PREPARATION AND PROPERTIES OF V^(+5)/TiO_2 NANOSCALE POWDERS

以 ＴｉＣｌ_１３为源物质．通过添加强氧化剂，用溶胶－凝胶法制备掺杂 Ｖ^（＋５）的ＴｉＯ_２纳米粉末．研究了该材料的结构、晶粒尺寸和分散性在不同掺钒量和烧结时间（４００℃）条件下的变化规律．结果表明，Ｖ^（＋５）在 ＴｉＯ_２中形成替位式掺杂，使锐钛矿相结构产生微应力，不仅促进其向金红石相转变，而且使大晶粒扭曲畸变形成小晶粒．

Nanoscale TiO2 powders doping with vanadium by oxidizing sol-gel process were prepared using TiCl3 as a source matter. The influence of vanadium on the phase transition was studied, the changes in the crystal size and microstrain distributions obtained at 400°C were analyzed. The results show that the substitutes of V+5 for Ti+4 in the anatase structure cause distortions, formation of the rutile phase and decrease of crystal size. V+5/TiO2 powders with high dispersion, surface area and activity were obtained.