3,5-Dihydroxybenzoic Acid Loose Nanofiltration Membrane and Dye/Salt Separation Performance
In order to improve the dye/salt separation effect of the membrane on printing and dyeing wastewater,a new polyester loose nanofiltration membrane was prepared by interfacial polymerization(IP)on the surface of polyethersulfone bottom membrane by reacting with 3,5-dihydroxybenzoic acid as monomer and reacting with homobenzene trimacyl chloride(TMC)by low reactivity hydroxyl group.The chemical composition,surface properties and surface morphology of polyester composite film were characterized,the structural performance relationship of composite film was elaborated,and the influence of different preparation conditions on the performance of composite film was studied.Under the conditions of 3,5-dihydroxybenzoic acid,sodium hydroxide and benzenetricarbonyl chloride mass fractions of 0.3％,0.2％and 0.1％,respectively,and interfacial polymerization of 1 min,polyester composite film has ultra-high permeability[77.74 U(m2·h·bar)]and high dye retention rate(congo red,99.64％;direct red 23,98.48％)and high salt permeability(NaCl,91.51％;Sodium sulfate,85.63％).In a filtration experiment on the dye/salt mixture solution at 2 bar for 5 h,the composite membrane shows excellent antifouling and operational stability.
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