The factors contributing to the water-facilitated CO₂ capture in membranes are investigated. Since CO₂ transports through such hydrated membrane mainly in the form of bicarbonate, there is a pressing need for exploring the ionic transport mechanism. Herein, a series of composite charged membranes comprising a negatively charged polymer matrix and positively charged filler is proposed. For that, polymer brushes bearing imidazolium cations are grafted on graphene oxide and then dispersed in sulfonated poly (ether ether ketone) (SPEEK). Compared with the pristine SPEEK membranes, a significant enhancement in both CO₂ permeability and CO₂/N₂ selectivity is observed. The encouraging results are discussed considering proton conductivity and bicarbonate diffusivity. More interestingly, the membranes show simultaneously higher CO₂ permeability and CO₂/N₂ selectivity when the operating pressure or temperature are increased, supporting the occurrence of ionic transport mechanism arising from the unique anion-cation dual pathways at the polymer-filler interface.

研究了水促进膜中CO ₂捕集的因素。由于CO ₂主要以碳酸氢盐的形式通过这种水合膜迁移，因此迫切需要探索离子迁移机理。在此，提出了一系列包括带负电的聚合物基质和带正电的填料的复合带电膜。为此，将带有咪唑鎓阳离子的聚合物刷接枝在氧化石墨烯上，然后分散在磺化的聚醚醚酮（SPEEK）中。与原始SPEEK膜相比，CO ₂渗透性和CO ₂ / N ₂均显着提高观察到选择性。讨论了令人鼓舞的结果，其中考虑了质子传导率和碳酸氢根扩散率。更有趣的是，当操作压力或温度升高时，这些膜同时显示出更高的CO ₂渗透性和CO ₂ / N ₂选择性，从而支持了由于聚合物-填料界面处独特的阴离子-阳离子双通道而产生的离子迁移机理。