摘要
An organic-inorganic composite membrane was successfully prepared by means of electrostatic self-assembly of polyelectrolytes on silica sol-gel modified macroporous ceramic supports. The integrality of the as-prepared composite membrane was evaluated in pervaporation of ethanol/water mixtures. Membrane separation performance was optimized by studying the modification cycle, polyelectrolyte molecule structure, self-assemble conditions, thermal treatment conditions and operating temperatures. It was found that the polyelectrolyte molecule structure mainly affected the separation performance of the composite membrane after a two-cycle modification and raising pervaporation operating temperature was an efficient way to improve both membrane flux and water selectivity. The composite membrane deposited by 60 layer pairs of polyethylenimine/poly(vinyl sulfate) (PEI/PVS) showed a high flux of 18.4 kg m-2 h-1 and a water concentration enhancement from 6.2 to 35.3 wt.%. Our study demonstrates that the composite membrane prepared on macroporous ceramic support through our route is suitable for separation of liquid species at a molecular level.
源语言 | 英语 |
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页(从-至) | 78-86 |
页数 | 9 |
期刊 | Journal of Membrane Science |
卷 | 302 |
期 | 1-2 |
DOI | |
出版状态 | 已出版 - 15 9月 2007 |