Application of modified Cu-BTC-based mixed matrix membrane in CO2 separation
As a potential separation material,metal-organic frameworks(MOFs)have its unique pore structure,high adaptability and selectivity,and have a broad application prospect in the field of membrane separation.However,MOFs are vulnerable to damage in humid environments,which severely limits their application in membrane separation.Therefore,improving the water stability of MOFs is one of the important problems in realizing its application in the field of membrane separation.In this paper,Cu-BTC-AC filler with high water stability was prepared by the functionalization of ammonium citrate and MMMs with different filler content were prepared by embedding the obtained Cu-BTC-AC in Pebax 1657 matrix.The CO2/N2 separation performance of the Cu-BTC-AC/Pebax MMMs at 25℃under humid condition was examined.Compared with the pure Pebax membrane,the prepared MMMs show improved CO2 permeability and CO2/N2 selectivity,with an optimized CO2 permeance of 776.5 GPU accompanied by the CO2/N2 selectivity of 46.7.Besides,the high water stability of the filler originated from AC functionalization endows the prepared MMMs with potential for application in practical industrial gas separations.