论文部分内容阅读
利用XRD技术研究了以TiCl4为原料、用前驱体方法制备的金红石型TiO2的粒子成长及其动力学．结果表明：随着热处理温度的不断升高，TiO2纳米粒子的粒径也逐渐增大，在773K以下，粒子生长缓慢，在773K以上，粒子生长迅速．温度一定，TiO2粒子随热处理时间增加而长大，且在前2h内增长较快，2h后粒径趋于稳定，粒子的成长主要受温度控制，热处理时间对粒子成长影响较小；粒子成长的表观活化能以773K为界分为两部分，温度高于773K时，粒子生长表观活化能为54．62±373kJ／mol；温度低于773K时，粒子生长表观活化能为6．43±3．39kJ／mol．
The particle growth and kinetics of rutile TiO2 prepared by the precursor method using TiCl4 as raw materials were studied by XRD. The results show that with the increasing of heat treatment temperature, the particle size of TiO2 nanoparticles also increases gradually. Below 773K, the particles grow slowly, and the particle grows rapidly above 773K. At a certain temperature, the size of TiO2 particles increased with the increase of heat treatment time, and increased rapidly in the first 2 h. The particle size tended to be stable after 2 h. The growth of the particles was mainly controlled by the temperature and the heat treatment time had little effect on the growth of the particles. The apparent activation energy is divided into two parts by the 773K boundary. At temperatures above 773K, the apparent activation energy of the particles is 54.62 ± 373kJ / mol. At temperatures below 773K, the apparent activation energy of particles growth is 6.43 ± 3.39 kJ / mol.