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High-performance membrane with angstrom-scale manipulation of gas transport channels via polymeric decorated MOF cavities
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2021-02-16 , DOI: 10.1016/j.memsci.2021.119175
Bo Wang , Jiayou Xu , Jixiao Wang , Song Zhao , Xinlei Liu , Zhi Wang

Gas separation performance of mixed matrix membrane heavily depends on the pore structure of the nanofillers. Metal-organic frameworks (MOFs) are promising platform materials for constructing molecular-selective pores for specific applications. In this work, deliberately-selected polymers with CO2 affinity (PVAm, Pebax and PEI) are employed as pore regulators to manipulate the pore chemistry and size of MOF UiO-66 nanoparticles and consequently control gas transport rate of CO2 and N2 molecules. The branched polymer (polyethyleneimine (PEI)) grafted UiO-66, denoted as UKI, is beneficial to enhancing the membrane selectivity. The UKI doped Pebax/mPSf membranes exhibit CO2/N2 selectivity up to 278, 6.5 times of the bare Pebax/mPSf membranes. Meanwhile, the CO2 permeance is boosted from around 690 to 1120 GPU (1 GPU = 10−6 cm3 (STP)·cm−2·s−1·cmHg−1 = 3.35 × 10−10 mol m−2 s−1·Pa−1). The block copolymer (poly(ether block amide) (Pebax)) grafted UiO-66, denoted as UKX, is conducive to increasing the membrane permeance. The UKX doped Pebax/mPSf membranes exhibited CO2 permeance up to 1683 GPU, 2.45 times of the bare Pebax/mPSf membranes. Meanwhile, CO2/N2 selectivity increased from around 42 to 146. Additionally, excellent pressure-resistant property and outstanding stability are observed under simulated flue gas.



中文翻译:

高性能膜,可通过聚合物装饰的MOF腔体以埃级控制气体传输通道

混合基质膜的气体分离性能在很大程度上取决于纳米填料的孔结构。金属有机框架(MOF)是有前途的平台材料,可用于为特定应用构建分子选择性孔。在这项工作中,故意选择具有CO 2亲和力的聚合物(PVAm,Pebax和PEI)作为孔隙调节剂,以控制MOF UiO-66纳米颗粒的孔隙化学性质和尺寸,从而控制CO 2和N 2分子的气体传输速率。接枝的UiO-66(称为UKI)接枝的聚合物(聚乙烯亚胺(PEI))有利于提高膜的选择性。UKI掺杂的Pebax / mPSf膜表现出CO 2 / N 2选择性高达278,是裸Pebax / mPSf膜的6.5倍。同时,CO 2渗透性是从690左右提高到1120 GPU(1个GPU = 10 -6 厘米3(STP)·厘米-2 ·秒-1 ·厘米汞柱-1  = 3.35×10 -10 摩尔米-2 小号- 1 ·Pa -1)。接枝的UiO-66嵌段共聚物(聚(醚嵌段酰胺)(Pebax)),称为UKX,有助于提高膜的渗透性。UKX掺杂的Pebax / mPSf膜的CO 2渗透率高达1683 GPU,是裸Pebax / mPSf膜的2.45倍。同时,CO 2 / N 2 选择性从约42增加到146。此外,在模拟烟气中观察到了优异的耐压性能和出色的稳定性。

更新日期:2021-02-19
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