CHEN  Fangfang ¹ TONG  Zhi ¹ LI Dachuan ² LEI Tao¹

(1.School of Environmental and Chemical Engineering,Xi'an Polytechnic University, Xi'an Shanxi 710048, China ; 2.Shanxi

Modern Architecture Design and Research Institute,Xi'an Shanxi 710048, China )

Abstract:SiO₂-TiO₂ composite membrane was prepared by sol-gel process using tetraethoxy silicone (TEOS) and tetrabutyl titivate (TBOT) as raw materials. The thermal stability, the structural transformation before and after heat treatment, the surface morphology of composite membrane were characterized by TG-DTG, FI-IR and AFM, etc. The results showed that gradual drying or directly drying keeping 65% relative humidity can get gel film without crack; the composite membrane's thermal stability was good, there was no significant quality loss after 600℃; in the process of sintering, the different temperature range should use different heating rates, in order to prevent membrane cracking;

Keywords:SiO₂-TiO₂ composite membrane, sol-gel, preparation, characterization