Boosting CO2 transport in mixed matrix membranes with poly (ionic liquids)/ZIF-8 by interconnected network

The construction on the interconnected network can be considered as a potential strategy for boosting CO 2 transport in mixed matrix membranes (MMMs). In this study, poly (ionic liquids)/ZIF-8 (PIL/ZIF-8) was synthesized and incorporated into sulfonated poly (ether ether ketone) (SPEEK) matrix to fabricate MMMs for rapid CO 2 transport. Wherein, ZIF-8 with a highly porous framework within PIL/ZIF-8 can efficiently capture CO 2 and allow CO 2 simultaneously transport in multi routes, thus improving CO 2 separation performance of SPEEK/PIL/ZIF-8 MMMs. PIL in PIL/ZIF-8 can guide the rapid transport of CO 2 in an orderly manner with the help of the anion CO 2 carriers (Cl − ) on the PIL chains, accelerating CO 2 transport in the MMMs. And the interconnected network was constructed by incorporating PIL/ZIF-8 in MMMs, which was endowed with the excellent CO 2 separation performance. And the CO 2 permeability and CO 2 /CH 4 selectivity of SPEEK/PIL/ZIF-8-7 MMM were 1641 ± 41 Barrer and 32 ± 0.9, respectively, approaching the 2019 upper bound. It implied that the construction on the interconnected network in MMMs had great potential for rapid CO 2 transport.