摘要
本文用ＴＥＯＳ和硅溶胶作原料，用溶胶一凝胶法制备了无支撑体和有支撑体的ＳｉＯ２膜．用ＴＥＯＳ制得的无支撑体ＳｉＯ２膜，无１．７ｎｍ以上的微孔，由硅溶胶制得的无支撑体ＳｉＯ２膜平均孔径为７．５ｎｍ，且孔径分布集中，这种差异主要来自于由不同原料制备的溶胶，其聚合物分子具有不同的形态和生长模式．用ＴＥＯＳ作原料，在无过渡层的α－Ａｌ２Ｏ３多孔支撑体上制得了无大孔缺陷、厚约１５μｍ的ＳｉＯ２膜，膜对ＢＳＡ的百分截留率为７５．８％．在有过渡层的α－Ａｌ２Ｏ３上制得的ＳｉＯ２膜的纯Ｎ２渗透表现为Ｋｎｕｄｓｅｎ扩散特征．起超滤和扩散作用的是ＳｉＯ２膜层内部的缺陷微孔．
Supported and unsupported silica membranes were prepared by sol-gel process from both TEOS and colioidal silica precursors. There was no pores larger then 1.7nm for unsupported silica membranes obtained from TEOS precursor. The mean pore diameter was 7.5nm for unsupported silica membranes obtained from colloidal silica. Difference of pore size could be mainly attributed to different shapes and growth moulds of polymeric molecules in the sol-gel process. Supported silica membranes with thickness of 15 pm and without large defaults were prepared born TEOS precursor on α-Al2O3 supports without intermediate zone. Percent rejection of BSA was determined to be 75.8%. Nitrogen permeability measurement of the silica membranes on the α-Al2O3 supports with intermediate zone showed that supported silica membranes had Knudsion diffusion characterization.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第4期429-436,共8页
Journal of Inorganic Materials
基金
863青年基金
