超滤SiO_2膜的制备与性能研究

The preparation and properties of ultrafiltration SiO 2 membrane

使用溶胶凝胶方法在０４５μｍ的αＡｌ２Ｏ３载体膜上制得了平均孔径为２ｎｍ、整体孔隙率为４５％的αＡｌ２Ｏ３ＳｉＯ２超细孔复合膜。红外光谱测试结果表明，超滤ＳｉＯ２膜与αＡｌ２Ｏ３载体膜之间是通过Ｓｉ—Ｏ—Ａｌ键而形成的化学结合。研究了ＣＯ２，Ｎ２，Ｏ２渗透通过膜的传递特性，结果表明，ＣＯ２对Ｎ２，Ｏ２的理想分离因子分别为１２４和１２５。

A α Al 2O 3 ceramic tube with average pore size of 0.45μm and porosity of 50% supported SiO 2 membrane was made by Sol Gel technology as well as treating impregnation drying calcination several times. The composite α Al 2O 3 SiO 2 membrane has average pore size of 2nm and porosity of 45%. IR results showed that the SiO 2 membrane was linked with α Al 2O 3 substrate by Si—O—Al band. The gas permeation through composite membrane was studied. The membrane has high selectivities of CO 2, N 2 (1 24) and CO 2, O 2(1 25).