In order to improve the separation performance of mixed-matrix membranes(MMMs)for flue gas and water-containing natural gases,a water stable CA-Cu-BTC filler was synthesized through functionalization with citric acid(CA),and MMMs with different content of filler were prepared by embedding the obtained CA-Cu-BTC in Pebax 1657 matrix.The CO2/N2 separation performance of the CA-Cu-BTC/Pebax MMMs at 25 ℃ under humid condition was examined.The results show that,compared to the pure Pebax membrane,the prepared MMMs show improved CO2 permeability and CO2/N2 selectivity,with an optimized CO2 permeability of 837.2 GPU accompanied by the CO2/N2 selectivity of 49.1.Besides,the high water stability of the filler originated from CA functionalization endows the prepared MMMs with potential for application in practical industrial gas separations.
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