Study on preparation of ZIF-8/PSF composite membrane and its CO2 separation performance
Mixed matrix membranes(MMMs),composed of inorganic fillers and organic substrates,are widely believed to play an important role in CO2 separation.In this study,a layer-by-layer composite technology was developed,that is,the ZIF-8 layer with high adhesive strength to the porous support was prepared by the dip coating and thermal conversion method,and then the ZIF-8/PSF mixed matrix composite membrane was achieved by coating PSF polymer solution on the ZIF-8 layer.Due to the excellent interfacial bonding strength between the membrane matrix and the coating layer,the ZIF-8/PSF composite membrane showed CO2-preferred permeability.For equimolar CO2/CH4 mixture separation,the CO2 permeance was 1.5X10-8 mol/(m2·s·Pa)and the selectivity of CO2/CH4 was 39.In addition,the ZIF-8/PSF membrane exhibited satisfactory temperature and pressure resistance,and durability.
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