Nanofiltration membrane technology has been widely used in water treatment processes,but it still faces problems such as reduced permeation flux and fouling during long-term operation.In this study,the amino functionalized zeolite imidazolium ester framework-8(AZIF-8)was combined with sodium alginate(SA)hydrogel network on a porous substrate to construct an organic-inorganic nanocomposite active layer of high-efficiency gel network to prepare a composite nanofiltration membrane(SAZM)with strong permeability and excellent anti-fouling performance.The combination of AZIF-8 and SA hydrogel could overcome the problems of agglomeration and compatibility of nanomaterials.The hybrid nanogel network imparts nanofiltration membranes with strong hydrophilicity and antifouling properties provided a convenient path for the transport of water molecules.The results showed that SAZM exhibited stable interception performance against the divalent salt Na2SO4,and the permeation flux increased from 4.1×10-2 L/(m2∙h∙kPa)to 16.3×10-2 L/(m2∙h∙kPa),an increase of 297.6%.In the bovine serum albumin contamination experiment,SAZM showed excellent anti-fouling performance,and the flux recovery rate reached 95.1%.
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