Abstract:In order to solve the problem of poor acid resistance of traditional nanofiltration membrane, a new type of composite nanofiltration membrane was prepared by interfacial polymerization, with porous polysulfone ultrafiltration membrane as the base membrane, and triethylenetetramine, terephthalic acid(TPA) and naphthalene-1,3,6-trisulfonylchloride as raw materials. The membrane morphology, hydrophilic, surface charge, separation performance and acid resistance were studied. The results showed that the addition of TPA improved the membrane hydrophilicity, electronegativity and acid resistance. When the mass fraction of the TPA was 0.15%, the composite nanofiltration membrane had the best performance, the pure water flux of 17.0 L/(m2·h), and the retention rate of MgSO4 reached 91.3%. The membrane showed good stability performance after soaking in the solution of 3% HCl and 20% H2SO4 by mass for 30 days. This composite nanofiltration membrane has potential applications for acidic wastewater treatment.