Preparation of ZIF-8 derivative composite membrane by freezing assisted-interface reaction method and its pharmaceutical desalination performance
The nanofiltration membrane separation technology has great potential for application in the field of pharmaceutical desalination.The development of new membrane materials with high performance has a great challenge.In this study,a ZIF-8 separation layer was prepared on alumina substrate using a freezing assisted-interface reaction method.Subsequently,the ZIF-8 derivatives(ZnS)were formed through sulfurization treatment to improve the permeability and stability of the nanofiltration membrane.The structure and morphology of ZIF-8 and its derivative composite membranes were characterized by SEM,EDS,XRD,FTIR,and AFM.The obtained ZIF-8 and its derivative composite membranes were used for pharmaceutical desalination.The effects of precursor molar ratio,concentration,and reaction temperature on nanofiltration performance were investigated.With the optimal conditions,the ZnS nanofiltration membrane exhibited a rejection rate of 99.1％for tetracycline,less than 10％for NaCl,and a flux of 335.6 L/(m2·h·MPa),demonstrating good pharmaceutical desalination performance and stability.
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