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用溶胶-凝胶工艺在涂覆两层ZrO2中间层的堇青石多孔陶瓷管上制备TiO2超滤膜。通过X射线衍射、扫描电子显微镜、孔隙度分析仪及原子力显微镜分析膜材料的形貌、厚度和孔隙率与结构。结果表明:所制备的各层膜结构完整、厚度合适且孔径分布均匀呈阶梯式递减;主晶相为锐钛矿的TiO2超滤膜,厚度为50nm,最可几孔径为15nm左右。对薄膜的渗透性能测试结果表明:所制样品对纯水的平均渗透率为131.6L/(h·m2·MPa),0.2MPa工作压力下对分子量580000右旋糖苷的截留率为94.76%。
A TiO2 ultrafiltration membrane was prepared on a cordierite porous ceramic tube coated with two layers of ZrO2 interlayer by a sol-gel process. The morphology, thickness, porosity and structure of the membrane materials were analyzed by X-ray diffraction, scanning electron microscopy, porosity analysis and atomic force microscopy. The results show that the prepared films have complete structure, suitable thickness and uniform pore size distribution. The main crystalline phase is anatase TiO2 ultrafiltration membrane with the thickness of 50nm and the most probable pore size of about 15nm. The results of permeation test showed that the average permeability of the sample to pure water was 131.6L / (h · m2 · MPa), and the rejection of dextran with molecular weight of 580000 under the pressure of 0.2MPa was 94.76%.