A thin-film composite (TFC) mixed matrix membrane (MMM) was prepared using an ionic liquid (IL) and zeolitic imidazolate framework-8 (ZIF-8) dispersed in a polymerizable ionic liquid (PIL) matrix for CO separation. A PIL comb copolymer, i.e., poly(1-allyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide-co-poly(ethylene glycol) methyl ether methacrylate) (poly(AMIM-TFSI--POEM), PAP), was synthesized via free radical polymerization. The IL 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][TFSI]) served as an enhancing agent for CO solubility, while 60 nm-sized ZIF-8 nanoparticles acted as a size-sieving agent. Excellent miscibility and chemical interactions among the ternary systems were achieved because of the strong adhesive properties of PAP and its similar chemical structure. The crystalline and pore structures of ZIF-8 were fully maintained in the MMM, with no significant PAP/IL infiltration into the pores of ZIF-8. The 600-nm-thick TFC-MMM with the PAP/IL/ZIF-8 ternary system exhibited excellent CO separation performance, with a CO permeance of 1017 GPU, CO/N selectivity of 33, and CO/CH selectivity of 13, satisfying the commercial criteria required for post-combustion CO capture.

中文翻译：

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基于可聚合离子液体梳型共聚物的薄膜复合混合基质膜用于CO2分离

使用分散在可聚合离子液体 (PIL) 基质中的离子液体 (IL) 和沸石咪唑酯骨架 8 (ZIF-8) 制备薄膜复合材料 (TFC) 混合基质膜 (MMM)，用于 CO 分离。 PIL梳型共聚物，即聚(1-烯丙基-3-甲基咪唑鎓双(三氟甲磺酰)亚胺-聚(乙二醇)甲醚甲基丙烯酸酯)(聚(AMIM-TFSI--POEM)，PAP)，通过自由基聚合。 IL 1-乙基-3-甲基咪唑鎓双(三氟甲基磺酰基)亚胺 ([EMIM][TFSI]) 充当 CO 溶解度的增强剂，而 60 nm 尺寸的 ZIF-8 纳米粒子充当尺寸筛分剂。由于 PAP 的强粘合性能及其相似的化学结构，三元体系之间实现了优异的混溶性和化学相互作用。 ZIF-8 的晶体和孔结构在 MMM 中完全保持，没有明显的 PAP/IL 渗透到 ZIF-8 的孔中。采用PAP/IL/ZIF-8三元体系的600 nm厚的TFC-MMM表现出优异的CO分离性能，CO渗透率为1017 GPU，CO/N选择性为33，CO/CH选择性为13，满足燃烧后二氧化碳捕集所需的商业标准。