溶胶-凝胶法制备纳米TiO_2及粒径控制工艺

Nanometer Titanium Dioxide Particle and Size Control Technology by Sol-Gel Mothod

采用溶胶-凝胶法,以钛酸丁酯为前驱体,乙二醇作为螯合剂制备纳米TiO2粒子.考察钛的乙二醇盐的浓度、pH值、温度等因素对TiO2粒径的影响,并用红外光谱和SEM对纳米TiO2粒子进行结构和形貌表征.结果表明,采用溶胶凝胶法可以制备出呈椭圆形且粒径分布均匀的TiO2纳米粒子.使用硝酸铵可以有效阻止TiO2纳米粒子团聚.当pH值为2～3、温度为20 ～ 40℃,钛的乙二醇盐在丙酮中的浓度为0.03、0.05及0.07 M时,粒径分别为150、240及600 nm.

Nanometer titanium dioxide particles have been prepared by the sol-gel method,in which butyl titan- ate as precursor, ethylene glycol as a chelating agent. And the glycol of titanium salt concentration, pH value, tempera- ture on the influence of the particle size titanium dioxide were studied. Moreover, the structure and morphology of nan- ometer titanium dioxide particles were characterized by infrared spectroscopy and SEM. The experimental results show that uniform size distribution of nanoparticles titanium dioxide can be prepared by sol-gel method. Using ammonium ni- trate could effectively prevent the titanium dioxide nanoparticles reunion. When pH value is 2 to 3, the temperature is 20℃ to 40℃ ,the concentration of titanium salt of ethylene glycol in the acetone is 0. 03 M ,the diameter of titanium dioxide nanopartiele is 150 nm ;the concentration of titanium salt of ethylene glycol in the acetone is 0. 05 M ,the parti- cle size is 240 nm ; and when the concentration of titanium salt of ethylene glycol in the acetone is 0. 07 M, the diame- ter of titanium dioxide nanopartieles can reach to 600 nm.