热处理温度对熔融分相法制备纳米TiO2影响的研究

用熔融分相法制备TiO2光催化材料的原理基于通过调节分相结构控制析晶尺寸。本文重点研究在制备过程中热处理条件对玻璃分相与TiO2析晶及光催化效果的影响。试样的组成选在Na2O-B2O3-SiO2-TiO2体系的分相区域，1300℃熔融，在不同的温度下进行热处理，经酸处理后得到负载于富硅多孔玻璃的纳米TiO2光催化材料。结果表明为使分相尺寸与TiO2析晶速度相匹配，获得最佳的光催化效率，对不同组成的试样热处理条件以575～600℃／12h为宜。

Effects of heat treatment temperature on the preparation of nanometer TiO2 by melt-phase separation process

The principle of the preparation process is based on the adjustment of phase separation structure and the control of TiO2 crystallization grain size. The work has put emphasis on the understanding of heat-treatment temperature which effects on glass phase separation, TiO2 crystallization and photodegradation. The sample was melted at 1300℃, which based on Na2O-B2O3-SiO2-TiO2 glass system, and consequently heat-treated at various temperatures, finally through the process of acid treatment, a nanometer TiO2 photocatalytic material which was loaded on porous glass can be obtained. The result has shown that aim at making the phase separation structure size would match with crystallization rate and obtaining an optimal photodegradation, it was found that the suitable heat-treatment condition was 575～600℃/12h however it would slightly change with the composition variations.