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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．
In this paper, TEOS and silica sol as raw materials, a sol-gel method was prepared without support and support SiO2 film. The unsupported SiO2 film with TEOS, no micropores above 1.7 nm, the average pore diameter of the unsupported SiO2 film from silica sol was 7.5 nm, and the pore size distribution was concentrated mainly from the Sol prepared from different raw materials, the polymer molecules have different morphologies and growth patterns. Using TEOS as raw material, a SiO2 film with no hole defects and a thickness of about 15μm was prepared on α-Al2O3 porous support without transition layer. The percentage rejection of BSA to the film was 75.8%. The pure N2 permeation of the SiO2 film prepared on the α-Al2O3 with the transition layer shows the Knudsen diffusion characteristics. From the ultrafiltration and diffusion is the SiO2 film defects within the pores.