溶胶-凝胶法制备负载型TiO_2膜的研究

STUDY ON PREPARATION OF SUPPORTED TiO 2 MEMBRANE BY SOL GEL METHOD

本研究采用溶胶－凝胶（Ｓｏｌ－Ｇｅｌ）法制备了负载型ＴｉＯ２膜，并采用ＳＥＭ、压汞等实验手段对Ｔｉ（ＯＨ）４溶胶和ＴｉＯ２膜进行了表征。实验表明：Ｔｉ（ＯＨ）４溶胶制备过程中Ｈ２Ｏ／Ｔｉ４＋、Ｃ２Ｈ５ＯＨ／Ｔｉ４＋的比值，溶胶在支承管上浸涂的时间、次数以及凝胶煅烧升温速度和煅烧温度均是制备负载型ＴｉＯ２膜的重要因素。最终制得一种无裂纹、２０μｍ厚、孔径分布在５０～３００ｎｍ之间的负载型ＴｉＯ２膜。

Supported TiO 2 membrane have been prepared by sol gel method.By using the SEM,pressing mercury techniques,Ti(OH) 4 sol and TiO 2 membrane have been characterized.The experimental results show that:The ratio of H 2O/Ti 4+ 、C 2H 5OH/Ti 4+ in preparing the sol,Impregnation time,the amount of aditives,speed of temperature raising,as well as terminal temperature in the process of membrane formation have directly affected the preparation of supported TiO 2 membrane directly.The thick of supported TiO 2 membrane is about 20μm.Being a good inorganic membrane its pore size is between 50～300nm.