低温制备金红石型纳米TiO_2粉体

PREPARATION OF NANOSIZE RUTILE TITANIA POWDERS AT LOW TEMPERATURE

利用TiCl4低温水解法,添加TiO2溶胶制备了纳米TiO2粉体。用X射线衍射、透射电子显微镜和激光粒度仪研究了制备的纳米TiO2粉体的晶型、形貌、晶粒尺寸及粒径分布。结果表明:所得纳米TiO2粉体原始沉淀为金红石型,其粒径为10nm左右的棒状粒子,经500℃煅烧2h,获得结晶完整、球形、粒径分布很窄的纳米TiO2粉体,其平均粒径为34nm,粒径分布范围为20～50nm。

Titania nano-powders were prepared by a hydrolysis method using TiCl4 with TiO2 sol added at low temperature. The crystal phase, the grain shape and size, and distribution of the particle diameters of TiO2 nano-powders were characterized by＇X-ray diffraction, transmission electron microscope and laser particle size test. The experimental results show that the as-prepared powders are rutile phase and rodqike, and the grain size of the powders is about 10nm. The average size of the powders with a spherical shape calcined at 500 ℃ for 2 h is 34 nm, and the diameter distribution range of the powders is 20-50 nm.