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چکیده
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This study investigates the enhancement of CO2 separation performance in mixed matrix membranes (MMMs) by incorporating novel multi-component fillers within a PEBAX-1657 polymer matrix. The multi-component fillers, comprising graphitic carbon nitride (g-C3N4), titanium dioxide (TiO2), and metal-organic frameworks (MIL-125 and NH2-MIL-125), are synthesized and integrated into the polymer matrix. Membrane characterizations confirm the successful incorporation of fillers while preserving the polymer’s inherent structural integrity. The PCN-Ti-NMIL/15 MMM exhibits optimal gas transport properties, achieving a CO2 permeability of 120.6 Barrer and a CO2/N2 selectivity of 42.3 at a feed pressure of 2 bar. These values represent significant improvements of 139.7% and 120.3%, respectively, compared to the pristine PEBAX membrane. The unique structure of the multi-component fillers, characterized by multi-channel pathways encompassing MOF pores and interstitial spaces between nonporous g-C3N4/TiO2, and PEBAX matrix facilitates enhanced gas transport through size-sieving and polar interactions. The homogeneous distribution of the multi-component fillers within the polymer matrix leverages the synergistic effects of g-C3N4, TiO2 and MOFs, maximizing their individual gas separation capacities. Subsequent impregnation of the composite fillers with polyethylenimine (PEI) results in a substantial increase in CO2/N2 selectivity to 60.1 while maintaining a commendable CO2 permeability of 108.2 Barrer for the PPEI-CN-Ti-NMIL MMM. These achievements have significant implications for the development of advanced membrane systems with superior CO₂ separation performance for both environmental and industrial applications.
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