Influencing Factors in the Preparation of Nanometer TiO2 Powder by Polymerized Sol-gel

Abstract:TiO2 sol was prepared by sol-gel method using tetrabutyl titanate as a precursor, absolute ethanol as a solvent，acetic acid as inhibitors, nitric acid as catalyst under low temperature conditions. A quantitative analysis finds that the optimum processing conditions for the preparation of nanoscale TiO2 are when VC2H5(OH): VTi(OC4H9)4 =6, VH2O: VTi(OC4H9)4 =1, VCH3COOH: VTi(OC4H9)4 =1,and the pH value of mixture is adjusted to between 3 and 4, the time of gel polymeration lasts nearly 3 hours, the calcinating time lasts for 2 hours 0under 50℃. The particles of nanometer titanium are 800nm in diameter when characterized by laser granulometer and 25nm on average when characterized by XRD.