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Abstract
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In this study poly(vinylidene fluoride) (PVDF) was modified by a mixture of KOH and KMNO4 in order to HF elimination. During this reaction, some functional groups were created in PVDF structure. The metal organic frameworks, MIL- 53(Al) and NH2-MIL-35(Al), were embedded in modified PVDF (M-PVDF) to fabricate mixed matrix membranes (MMMs). Different characterization techniques such as FT-IR, XRD, SEM, DSC, TGA and contact angle tests have been implemented to recognize the prepared membranes. Pure and mixed (1:1) CO2 and CH4 were used to test gas separation performance of MMMs. CO2 permeance was increased for pure M-PVDF membrane compared to the pristine PVDF by 31.2%. Upon 10 wt% loading of MIL-53(Al) and NH2-MIL-35(Al) in M-PVDF, CO2 permeability increased 104.33 and 80.02% relative to the unfilled M-PVDF. The highest CO2/CH4 ideal selectivity and separation factor of 43.9 and 42.65 were reported for NH2-MIL-35(Al)/M-PVDF with 10 wt% loading, respectively. These improvements could be attributed to the breathing effect of MOFs, created polar moieties in PVDF through the modification and hydrogen bonding interactions between the MOFs and the polymer.
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