膜科学与技术

晶种促进相转变制备小孔径氧化铝超滤膜

作者：张伟，陈献富，林钰青，邱鸣慧，范益群

单位：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

关键词：溶胶凝胶法；α相氧化铝；晶种；超滤膜

出版年,卷(期):页码： 2016,36(1):12-16

摘要：

在溶胶凝胶法颗粒溶胶路线制备α相氧化铝超滤膜的基础上，通过添加适量的氧化铝晶种促进勃姆石在较低的相转变温度下实现从无定型态向完全α相的晶型转变过程，以减弱氧化铝晶粒在完成α相形核后因高温继续生长，进而获得由较小氧化铝颗粒堆积的膜孔，制备出具有良好截留性能的小孔径氧化铝超滤膜. 结果表明：按照此种方法添加6 dwb%氧化铝晶种，勃姆石即可在1000 oC、保温1 h的条件下发生完全的α相转变，所制备的α相氧化铝超滤膜的截留性能相比于由纯勃姆石制备的氧化铝超滤膜有了较大的提升，证明孔径缩小，其葡聚糖的截留分子量为13.0 kDa，对应膜孔径为5.2 nm，纯水渗透率为140 L/(m2•h•bar).

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.

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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