二氧化钛超滤膜的制备及其渗透性能

PREPARATION AND PERMEABILITY PERFORMANCE OF TiO_2 ULTRAFILTRATION MEMBRANES

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%。

TiO2 ultrafiltration membranes on porous cordierite ceramic tubular supports coated with two ZrO2 intermediate layers were prepared by sol - gel technique. The microstructure, thickness and pore size distribution of ZrO2 intermediate layers and TiO2 membranes were characterized by X-ray diffraction, scanning electron microscope, atomic force microscope and a porosity apparatus. The results indicate that the product ultrafihration membrane is the phase in anatase TiO2 with a thickness of 50nm, the structure of the membranes ohlained is perfect and the pore diameter distribution is even; the most probable pore size is about 15 nm. The filtration tests for TiO2 ultrafiltration membranes show that the average permeability for pure water is at 131.6 L/ （h · m^2 · MPa） and the rejection for dextran of molecular weight 580 000 is 94.76% at 0.2 MPa working pressure.