关键词: 凝胶, 纳米, TiO2, 制备

Abstract: A dialysis membrane was used to make H⁺ and Cl^- dialyze out slowly during the hydrolysis of TiCl₄, and then TiO₂ gel was obtained. The gel was dried by different methods and then calcined. The samples were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), BET surface area and BJH pore size distribution. For comparison, the hydrolysis of TiCl₄ by the methods of heating and adding ammonia, and the hydrolysis of tetrabutyl titanate by the sol-gel method were researched. The product prepared by the dialysis method has an enormous specific surface area and the crystallites are small and uniform. It has a high phase transform temperature, keeping anatase after calcination at 700℃ and transforming into rutile phase at 900℃.

Key words: gel, nanometer, TiO2, preparation