新型耐酸复合纳滤膜的制备与性能

为解决传统纳滤膜耐酸性较差的问题，以多孔聚砜超滤膜为基膜，以三亚乙基四胺、对苯二甲酸（TPA）与1,3,6-萘三磺酰氯为原料，采用界面聚合法制备一种新型复合纳滤膜，并对膜的形貌、亲水性、表面电荷、分离性能和耐酸性等进行了研究。研究结果表明，TPA的加入使膜的亲水性、电负性和耐酸性都有所提高；当TPA的添加质量分数为0.15%时，所制备的复合纳滤膜性能最好，其纯水通量可达17.0 L/(m2·h)，对MgSO4的截留率可达91.3%。浸泡于质量分数为3%的HCl和20%的H2SO4溶液30 d后，该膜呈现出较好的稳定性能。本复合纳滤膜对工业酸性废水处理具有潜在的应用价值。

Preparation and Performance of a Novel Acid-Resistant Composite Nanofiltration Membrane

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.