工业TiCl_4水溶液水解制备金红石型二氧化钛纳米粒子

Preparation of nanocrystalline titanium oxide of rutile type by hydrolysis of industrial aqueous TiCl_4 solution

报道了以盐酸法制备的工业四氯化钛水溶液为原料,采用外加纳米晶种升温水解的方法, 较低温度下制备了锐钛型,金红石型纳米二氧化钛及其混晶。实验发现产物的晶型与水解时间密切相关,水解时间小于50min,产物是以金红石型为主锐钛型为辅的二氧化钛混晶,当水解时间大于70min 时,产物全部转化为金红石型纳米二氧化钛晶体。晶体的平均粒径为5 nm左右,经BET法测定其表面积为155m2／g。

Nanocrystalline TiO2 particles of anatase, rutile and mixture of them were prepared by the method of hydrolysis controlled increasing temperature in the presence of the added precours of nanocrystalline, Different from the general hydrothermal synthesis, this synthesis method was using the cheap industrial aqueous TiCl4 solution that produced from method of hydrochloric acid as the raw materials, And the temperature of the process was comparatively low. The types of the crystalline were related to the reaction time. Mix-crystalline of TiO2 mainly composed of futile and partly of anatase was produced when the reaction time was lower than 50 min. All of the products converted to futile type as the prolonging of reaction time more than 70 min. The average diameter of the nanocrystalline TiO2 was about 5 nm and the BET surface area was 155 m^2/g.