A Novel UIO‐66/Pebax® 1657 Mixed Matrix Membrane Exhibiting Superior CO ₂ Separation Performance via Nonthermal Air Plasma Modification

Abstract This paper synthesized a new mixed matrix membrane for CO 2 separation. First, the metal‐organic framework UIO‐66 was treated with air plasma for modification and then embedded in Pebax® 1657. The 10% UIO‐66/Pebax® 1657 mixed matrix membranes treated with air plasma significantly improved interfacial compatibility and CO 2 adsorption capacity, showing excellent performance. Its permeability reached 453 Barrer as CO 2 and the selectivity was 37.8 as CO 2 /N 2 . It was confirmed by characterization techniques such as FTIR, XRD, XPS, TGA, NMR, and SEM that the plasma successfully introduced ─NH 2 groups and active sites on the UIO‐66 surface, thereby significantly improving the interfacial compatibility and adsorption characteristics of the mixed matrix membrane. In this study, the high‐performance CO 2 separation membrane aP‐UIO‐66/Pebax was innovatively enhanced through the synergistic effects of graft modification and defect engineering on UIO‐66 using nonthermal plasma technology. This approach offers a novel strategy for membrane performance optimization.