膜科学与技术

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Fabrication of alpha alumina membrane for tight ultrafiltration with the aid of alpha-Al2O3 seeds

Authors： ZHANG Wei, CHEN Xianfu, LIN Yuqing, QIU Minghui, FAN Yiqun*

Units： State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, China

KeyWords： sol-gel; alpha alumina; alpha-Al2O3 seeds; ultrafiltration membrane

ClassificationCode：TQ174

year,volume(issue):pagination： 2016,36(1):12-16

Abstract：

Tight alpha alumina ultrafiltration membranes were prepared via a colloidal sol-gel route by adding alpha-Al2O3 seeds. The effects of adding alpha-Al2O3 seeds on the phase transition of alumina derived from boehmite and the microstructure of alumina membranes were investigated at various temperatures. Results showed that the addition of alpha-Al2O3 seeds plays an impressive role on the promotion of alumina phase transition. The alpha transformation of alumina can be accomplished completely by adding 6 dwb% alpha-Al2O3 seeds at 1000 oC for 1 hour holding time. Comparing to the membrane without adding alpha-Al2O3 seeds, alpha alumina ultrafiltration membrane prepared by adding alpha-Al2O3 seeds showed relatively small pore size and high retention performance. The molecular weight cut off obtained from the retention of dextran was calculated to be 13.0 kDa, corresponding to an average pore size of 5.2 nm. Meanwhile, such membranes exhibited high pure water permeability of 140 L/(m2•h•bar). The alpha-Al2O3 seeds assisted colloidal sol-gel method showed a good potential to prepare tight alpha alumina ultrafiltration membrane from boehmite sol.

Funds：

国家“863”计划课题(2012AA03A606)、江苏高校优势学科建设工程资助项目(PAPD)

AuthorIntro：

张伟(1989-), 男, 安徽省六安人, 硕士, 从事膜分离材料的研究与应用. *通讯作者, E-mail:yiqunfan@njut.edu.cn

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