溶胶-凝胶法制备TiO2掺杂α-Al2O3高通量陶瓷超滤膜  

Fabrication of high-flux TiO2-doped α-Al2O2 ultrafiltration ceramic membrane via a sol-gel method

作　　者：张伟 陈献富 范益群 ZHANG Wei;CHEN Xianfu;FAN Yiqun(State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing University of Technology,Nanjing 210009,China;Intelligent Manufacturing Institute of HFUT,Hefei 230000,China)

机构地区：[1]南京工业大学化工学院,材料化学工程国家重点实验室,南京210009 [2]合肥工业大学智能制造技术研究院,合肥230041

出　　处：《膜科学与技术》2020年第5期16-22,共7页Membrane Science and Technology

基　　金：国家自然科学基金资助项目(21838005,21921006);江苏省海洋科技创新专项项目(HY2018-10)。

摘　　要：为制备高通量α-Al2O3陶瓷超滤膜,采用改进的溶胶凝胶法,通过在勃姆石溶胶中添加TiO2促进Al2O3膜材料在相对较低的温度下由γ相向α相转变,改变了γ-Al2O3的片层结构,减小了曲折因子.基于溶质截留法,分析了TiO2的添加对膜材料孔径分布的影响.虽然TiO2的添加使得平均孔径有所增加,但提升了孔径分布的均一性.此外,TiO2的添加还提升了膜材料的亲水性.在多方面综合作用下,制备出高通量的α-Al2O3超滤膜,其平均孔径约为8.2 nm,纯水渗透率约为2 300 L/(m2·h·MPa).与未添加TiO2制备的超滤膜相比,其纯水渗透率提高了65%左右,但对葡聚糖的截留性能变化不大,截留分子量约为30 000.To prepare high-flux α-Al2O3 ceramic ultrafiltration membranes, an improved sol-gel method was used in this paper to promote the transition of the alumina membrane material from γ-phase to α-phase at relatively low temperatures by adding TiO2 to the boehmite sol-gel. The lamellar structure of γ-Al2O3 was changed, and the corresponding tortuosity factor was reduced. Based on the solute rejection method, the effect of TiO2 addition on the pore size distribution was analyzed. Although, the addition of TiO2 resulted in an increase in the average pore size, it enhanced the homogeneity of the pore size distribution. In addition, TiO2 enhanced the hydrophilicity of the membrane material. Finally, a high-flux α-Al2O3 ultrafiltration membrane with an average pore size of about 8.2 nm and a pure water permeability of about 2 300 L/(m2·h·MPa) was obtained. Compared to the ultrafiltration membrane obtained without the addition of TiO2, the permeability of the pure water was increased by about 65%, while the retention of dextran did not change much. The MWCO was kept at the original level of about 30 000.

关 键 词：高通量﹔陶瓷膜﹔氧化钛 氧化铝﹔超滤膜 

分 类 号：TQ174[化学工程—陶瓷工业]