Sol-gel法制备锐钛矿纳米TiO_2及晶粒长大动力学

Preparation of Anatase nano-TiO_2 by Sol-gol process and the growth kinetics of Anatase Crystallites

讨论了由Ti(OBu) 4经Sol- gel制备的凝胶经 80℃、6 0 0Pa、6h真空干燥处理后 ,经 75 0℃以下的不同温度处理晶化 ,晶体为纳米锐钛矿型TiO2 ,在 5 5 0℃以下 ,晶化的活化能E1=9.6 5 2KJ/mol,在 5 5 0℃以上晶化的活化能E2 =2 8 90 6KJ/mol.

Prepared the anatase nano-TiO 2 from Ti(OBu) 4 by sol-gel process,the gel treated by vacuum-baking (600 Pa,80 ℃,6h),then heated on different temperature(from 350℃～750 ℃),the amourphous TiO 2 petized,the crystalline is anatase nano-TiO 2 in whole range of temperature.The activation energy is 9.652 KJ/mol under 550 ℃,28.906 KJ/mol up to 550 ℃.