Journal of Membrane Science ( IF 9.5 ) Pub Date : 2021-02-19 , DOI: 10.1016/j.memsci.2021.119191 Wen-Hsiung Lai , Ming-Yen Wey , Hui-Hsin Tseng
Membrane-based separation systems have been widely explored for hydrogen production and purification in the development of next-generation fuels. In this work, we propose a thin film composite hollow fiber membrane (TFCHFM) for H2 purification, incorporating poly(styrene-co-butadiene) copolymers (SBC, 4% butadiene, for flexibility and ease of processing) and ZIF-8 nanoparticles. The TFC was supported on a PEI-based hollow fiber substrate. SBC containing a flexible butadiene segment showed enhanced compatibility through π-π interactions. The morphology of ZIF-8 was altered from a cubic shape to a smaller spherical shape by altering the molar ratio of NH4+/Zn2+. The gas separation mechanism of the ZIF-8 based TFC membrane was predicted by the Maxwell model. In the binary gas permeation test (5 vol% H2), the H2 permeance and H2/CH4 selectivity of TFCHFMs were 6.85 GPU and 152.20, respectively, with 50 wt% ZIF-8 loading. We believe that the high loading weight (50 wt% ZIF-8) and H2/CH4 selectivity presented here are unprecedented for ZIF-8 based TFC membranes reported in the literature.
中文翻译:
使用基于SBC @ ZIF的薄膜复合中空纤维膜进行高载量和高选择性H2纯化
在下一代燃料的开发中,已经广泛探索了基于膜的分离系统用于氢气生产和提纯。在这项工作中,我们提出了一种用于H 2净化的薄膜复合中空纤维膜(TFCHFM),其中包含聚(苯乙烯-共-丁二烯)共聚物(SBC,4%丁二烯,以提高灵活性和易加工性)和ZIF-8纳米颗粒。TFC被支撑在基于PEI的中空纤维基板上。含有柔性丁二烯链段的SBC通过π-π相互作用显示出更高的相容性。通过改变NH 4 + / Zn 2+的摩尔比,ZIF-8的形态从立方变成较小的球形。。通过Maxwell模型预测了基于ZIF-8的TFC膜的气体分离机理。在二元气体渗透测试(5 vol%H 2)中,TFCHFMs的H 2渗透率和H 2 / CH 4选择性分别为6.85 GPU和152.20,ZIF-8含量为50 wt%。我们相信,对于文献中报道的基于ZIF-8的TFC膜,此处介绍的高负载重量(50 wt%ZIF-8)和H 2 / CH 4选择性是前所未有的。