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Fabrication of high-flux TiO2-doped α-Al2O3 ultrafiltration ceramic membrane via a sol-gel method

Authors： ZHANG Wei 1,CHEN Xianfu 2, FAN Yiqun 2

Units： 1. Intelligent Manufacturing Institute of HFUT, Hefei 230000, 2. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 210009, China

KeyWords： high-flux; ceramic membrane; titania; alumina; ultrafiltration

ClassificationCode：TQ174

year,volume(issue):pagination： 2020,40(5):16-22

Abstract：

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 titania 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 titania addition on the pore size distribution was analyzed. Although, the addition of titania resulted in an increase in the average pore size, it enhanced the homogeneity of the pore size distribution. In addition, titanium oxide 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 2300 L/(m2·h·MPa) was obtained. Compared to the ultrafiltration membrane obtained without the addition of titania, 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 30.0 kDa.

Funds：

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)

AuthorIntro：

张伟(1989-)，男，安徽省合肥人，硕士，从事膜分离材料的研究与应用，lever-nasa@163.com

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