Abstract Polymers of intrinsic microporosity (PIMs) have attracted increasing interest in gas separation membranes due to their high permeability. However, the moderate selectivity limits their wide applications in CO2 separation. Herein we report a facile strategy to improve simultaneously the permeability and CO2 selectivity of PIMs membrane using the prepared PIM-1/graphene oxide (GO) nanosheets mixed matrix membrane. The GO nanosheets improves the hydrophilicity and surface roughness of PIM-1 membrane whereas the uniform assembly of GO nanosheets in the PIM-1 matrix creates the hydrophilic/hydrophobic microphase segregation in the membrane. The as-prepared mixed matrix membrane is also very porous and has a pore size of about 0.78 nm. The combination of these properties significantly contributes to the enhancement of the gas separation performance of PIM-1 membrane, with the resultant membrane exhibiting an exceptionally high CO2 permeability of up to 6169 barrer as well as a high CO2/N2 selectivity of 123.5, which is more than 7 times that of the pure PIM-1 membrane. The developed PIM-1/GO mixed matrix membrane should have a wide application in the CO2 separation.

中文翻译：

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氧化石墨烯纳米片可提高用于二氧化碳分离的 PIM-1 膜的渗透性和选择性

摘要 固有微孔 (PIM) 聚合物由于其高渗透性而引起了人们对气体分离膜越来越多的兴趣。然而，中等选择性限制了它们在 CO2 分离中的广泛应用。在此，我们报告了一种使用制备的 PIM-1/氧化石墨烯 (GO) 纳米片混合基质膜同时提高 PIMs 膜的渗透性和 CO2 选择性的简便策略。GO 纳米片改善了 PIM-1 膜的亲水性和表面粗糙度，而 GO 纳米片在 PIM-1 基质中的均匀组装会在膜中产生亲水/疏水微相分离。所制备的混合基质膜也非常多孔，孔径约为 0.78 nm。这些特性的结合显着提高了 PIM-1 膜的气体分离性能，所得膜表现出高达 6169 barrer 的超高 CO2 渗透率以及 123.5 的高 CO2/N2 选择性，这是是纯 PIM-1 膜的 7 倍以上。开发的 PIM-1/GO 混合基质膜在 CO2 分离中具有广泛的应用。