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        A simple seed-embedded method to prepare ZIF-8 membranes supported on flexible PESf hollow fibers

        Hangliao Zhang,Xiaobin Wang,Luyang Wei,Bo Meng,Xiaoyao Tan,Wanqin Jin,Shaomin Liu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-

        With intrinsic porous structure, unique chemical versatility and abundant application opportunities,MOF membranes have attracted substantial research enthusiasm. Most of these supported MOFmembranes are prepared on the rigid ceramic substrates. If the MOF membrane possessesflexibility, theapplication opportunities will be expanded. This paper presents the synthesis of ZIF-8 membranes on theflexible polyethersulfone (PESf) hollowfibers by using a facile seed-embedded method. The resultantmembranes were characterized by scanning electron microscopy, energy dispersive X-ray, X-raydiffraction and fourier transform infrared spectroscopy. The prepared membranes were in a continuousand compact structure and showed good molecular sieve performance of H2 over CO2, N2 and CH4 with H2permeance up to 1.110 5 mol m 2 s 1 Pa 1. Due to the preferential adsorption, ZIF-8/PESf compositemembrane exhibited high permeance of H2, N2, and CH4 compared to CO2, showing potential applicationsin efficient CO2 capture from industrial mixtures. The association between the gas permeation, theamount of embedded ZIF-8 crystals and the membrane thickness was also clarified. The reproducibilitywas significantly improved compared to the conventional secondary seeding method. Attributed to thestrong adhesion between the ZIF-8 and the PESf, the membranes displayed excellent stability andflexibility which could sustain bending up to 90 without breaking the ZIF-8 membrane. This seedembeddedmethod is not only simple, but also has good reproducibility and scalability.

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