改进浸浆法制备氧化钛／多孔钛复合微滤膜  

Preparation of TiO_2/Ti composite microfiltration membrane by modified dip-coating method

作　　者：范益群[1] 卢军[1] 徐南平[1] 

机构地区：[1]南京工业大学化学化工学院,材料化学工程国家重点实验室,南京210009

出　　处：《膜科学与技术》2011年第3期205-209,共5页Membrane Science and Technology

基　　金：国家重点基础研究发展计划(“973”计划)(2009CB623400);国家高技术研究发展计划(“863”计划)(2009AA033005);国家自然科学基金重点项目(20636020)

摘　　要：金属陶瓷复合膜以多孔金属为载体、多孔陶瓷为活性分离层,结合了陶瓷膜和金属膜的优点,具有良好的工业应用前景。采用改进浸浆法制备氧化钛/多孔钛复合微滤膜。将氧化钛粉体分散到氧化钛溶胶中作为制膜液,以提高制膜液在多孔金属支撑体表面的润湿性.结果表明,相同温度下溶胶的表面张力远小于水的表面张力,溶胶分散制膜液的表面张力也远小于水分散制膜液的表面张力.由此明显地改变了制膜液和支撑体的润湿性能,从而可以制备得到连续完整的膜层.由于溶胶粒子对粒径较大的氧化钛颗粒的烧结促进作用,使得膜层可以在较低的温度下烧结.在850℃下烧结的膜层平均孔径为0.31μm,且分布较窄.膜层表面完整无缺陷,与支撑体结合情况良好,膜层厚度约为17μm.膜层N2渗透通量为6.6×105L/(m2.h)(0.1 MPa).The metal-ceramic composite membranes consisting of a ceramic layer on a porous metal support, possess great potential for industrial application. A TiO2/Ti composite microfiltration membrane was prepared by modified dip-coating method. To improve wettability of the porous titanium support, titania powder was dispersed in titania sol instead of in water. The surface tension of titania sol was obviously smaller than the surface tension of water. It was demonstrated that the poor wettability of the porous titanium support could be effectively improved by using titania sol as dispersal system. The supported TiO2/Ti composite microfiltration membrane with a thickness about 17μm which was prepared by dip-coating and sintered at 850℃, presents a narrow pore size distribution and with a average pore size of 0. 31 μm, The nitrogen flux of the membrane was 6.6×10^5L/（m2·h）（0.1 MPa）.

关 键 词：氧化钛 多孔钛 溶胶 浸浆 复合膜 

分 类 号：TB383.2[一般工业技术—材料科学与工程]