Interfacial co-weaving of AO-PIM-1 and ZIF-8 in composite membranes for enhanced H-2 purification

文献类型： 外文期刊

第一作者： Xiong, Shaohui

作者： Xiong, Shaohui;Pan, Chunyue;Dai, Guoliu;Chen, Chuang;Yang, Song;Tang, Juntao;Yu, Guipeng;Liu, Cheng;Ruan, Xuehua;Tan, Zhijian

作者机构：

关键词： Defect-free interface; Co-weaving; Gas separation membranes; H-2 purification; CO2 removal

期刊名称：JOURNAL OF MEMBRANE SCIENCE （ 影响因子：10.53； 五年影响因子：9.761 ）

ISSN： 0376-7388

年卷期： 2022 年 645 卷

页码：

收录情况： SCI

摘要： Porous asymmetric composite membranes (ACMs) have attracted intensive attentions in energy-efficient gas separations. However, fabricating ACMs with defect-free interface and enhanced selectivity without sacrificing permeability remains great challenge. Herein, a major step towards this goal is proposed by employing an efficient co-weaving strategy to regulate interfacial microstructure of ACMs with bilayer geometry on porous substrates. The double layers are constructed by in-situ growing zeolitic imidazolate frameworks-8 (ZIF-8) on the surface of amidoxime-functionalized polymer of intrinsic microporosity-1 (AO-PIM-1) layer (denoted as AO-PIM1@ZIF-8). The pre-designed amidoxime groups on the AO-PIM-1 backbone provide abundant coordinate sites for Zn (II) ions, offering advantages for building a continuous membrane. Consequently, the obtained AO-PIM1@ZIF-8 membrane demonstrates remarkable performance in H-2/CO2 separations, with the H-2/CO2 selectivity of 11.97 and the H2 permeability of up to 5688 Barrer at 298 K and 1 bar. Both the H-2 permeability and H-2/ CO2 selectivity exceed most of reported ACMs, and far surpassed Robeson's 2008 upper bound by taking advantage of the molecular sieving effect of interfacial layer formed by co-weaving of AO-PIM-1 chains with ZIF8. This is contributed either by position-space renormalisation for AO-PIM-1 chains or pore space partition in ZIF8 at the interface. The study reports herein offer an alternative route to develop high-performance composite membranes for improved gas separations.

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