Electrophoretic Nuclei Assembly for Crystallization of High-Performance Membranes on Unmodified Supports
Electrophoretic Nuclei Assembly for Crystallization of High-Performance Membranes on Unmodified Supports
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DOI：
10.1002/adfm.201707427
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发表时间：
2018-05-16
影响因子：
19
通讯作者：
Agrawal, Kumar Varoon
中科院分区：
文献类型：
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作者：
He, Guangwei;Dakhchoune, Mostapha;Agrawal, Kumar Varoon
金属-有机骨架（MOF）膜是近年来发展起来的一种高选择性渗透膜，其气体透过率比传统膜高出几个数量级。然而，在没有复杂的载体改性的情况下，在多孔载体上合成高度共生的CIMOF膜已被证明是一个挑战。此外，迫切需要一种通用的结晶途径，能够合成各种各样的MOF结构的共生，薄膜形态。本文报道了一种用于高度共生薄膜结晶的新型电泳核组件（ENACT）方法，其允许在宽范围的未改性载体（多孔聚丙烯腈、阳极氧化铝、金属箔、多孔碳和石墨烯）上合成无缺陷的ZIF-8。结果表明，ZIF-8膜对H-2/CO2、H-2/N-2、H-2/CH 4和H-2/C3 H8的H-2渗透率分别为8.3 × 10（-6）mol m（-2）s（-1）Pa-1，理想气体选择性分别为7.3、15.5、16.2和2655。得到了9.9 × 10 ~（-8）mol·m ~（-2）s ~（-1）Pa ~（-1）的高C_3H_6渗透率和31.6的有吸引力的C_3H_6/C_3H_8选择性。的ENACT方法是简单的，可重复的，并可以扩展到广泛的纳米多孔晶体，其在共生ZIF-7薄膜的制造中的应用得到了证明。
Metal-organic framework (MOF) films have recently emerged as highly permselective membranes yielding orders of magnitude higher gas permeance than that from the conventional membranes. However, synthesis of highly intergrown, ultrathin MOF films on porous supports without complex support-modification has proven to be a challenge. Moreover, there is an urgent need of a generic crystallization route capable of synthesizing a wide range of MOF structures in an intergrown, thin-film morphology. Herein, a novel electrophoretic nuclei assembly for crystallization of highly intergrown thin-films (ENACT) approach, that allows synthesis of ultrathin, defect-free ZIF-8 on a wide range of unmodified supports (porous polyacrylonitrile, anodized aluminum oxide, metal foil, porous carbon and graphene), is reported. As a result, a remarkably high H-2 permeance of 8.3 x 10(-6) mol m(-2) s(-1) Pa-1 and ideal gas selectivities of 7.3, 15.5, 16.2, and 2655 for H-2/CO2, H-2/N-2, H-2/CH4, and H-2/C3H8, respectively, are achieved from an ultrathin (500 nm thick) ZIF-8 membrane. A high C3H6 permeance of 9.9 x 10(-8) mol m(-2) s(-1) Pa-1 and an attractive C3H6/C3H8 selectivity of 31.6 are obtained. The ENACT approach is straightforward, reproducible and can be extended to a wide range of nanoporous crystals, and its application in the fabrication of intergrown ZIF-7 films is demonstrated.