Architecting MOFs-based mixed matrix membrane for efficient CO2 separation: Ameliorating strategies toward non-ideal interface

• MOFs-based MMMs materials for CO 2 separation are systematically reviewed; • The non-ideal interface is the key obstruct for fabricating MMMs; • Advanced characterizations of the non-ideal interface are summarized; • Interfacial regulation is deconstructed as architecting single or multiple interfaces; • Several prospects for the defect-free MMMs are put forward. Due to the characteristics of simplicity, efficiency, adaptability and eco-friendly, membrane separation technology has been widely considered to play an important role in CO 2 separation. Mixed matrix membranes (MMMs) combined advantages of various components have attracted masses of attention, providing a potential possibility for the large-scale popularization and application of membrane separation technology. Metal organic frameworks (MOFs) are considered as ideal candidates to fabricate defect-free MMMs. However, the further application of MMMs was seriously hindered due to the non-ideal interface between MOFs and polymer matrix. The review focused on the interfacial structure between MOFs and polymer in MMMs for CO 2 separation. The interfacial optimization in MMMs was deconstructed into single enhancement of filler-polymer and multiple transitions of filler-extra phase-polymer. The prospects and potential problems of interfacial formation and advanced characterization of MOFs-based MMMs were discussed. Finally, the prospects and challenges for ultrathin and defect-free MMMs fabrication were outlined. This review will offer some inspiration for the fabrication of high-performance MMMs for CO 2 separation from the point of view of non-ideal interfacial regulation.