以聚砜超滤膜为基膜，通过间苯二胺（PDA）与均苯三甲酰氯（TMC）界面聚合制备聚酰胺复合纳滤膜。系统地考察了界面聚合条件对所得复合膜性能的影响及膜对不同类型的无机盐的分离性能。详细表征了基膜与复合膜的表面形貌和接触角。结果表明：最佳聚合条件为：PDA浓度1.5wt%，TMC浓度0.1wt%，水相浸泡时间3min，反应时间20s，热处理温度80℃，热处理时间3min。在0.6 MPa下，对2000mg/L的MgSO4的截留率和通量分别为95.6%和7 L•m-2•h-1。复合膜对四种不同类型无机盐的截留率的次序依次为Na2SO4＞MgSO4＞NaCl＞MgCl2。此外，表面形貌和接触角研究表明通过界面聚合在基膜表面形成了一层聚酰胺功能层。

Polyamide thin-?lm composite membranes were prepared by interfacial polymerization of 1,3-phenylene diamine (PDA) and trimesoyl chloride(TMC) on polysulfone(PSF) ultrafiltration membrane. The effect of interfacial polymerization conditions on the separation performance of composite membrane and the composite membrane separation properties for different salt solutions were systematically investigated. The surface morphology and contact angle of the composite and substrate membranes were analyzed by atomic force microscopy (AFM) and contact angle measurements, respectively. Results show that the optimum polymerization conditions are as follows: the concentration of PDA is 1.5 wt%, the concentration of TMC is 0.1 wt%, the soaking time in aqueous phase is 3 min, reaction time is 20 s, curing temperature is 80 ℃,curing time is 3 min. The membrane prepared under the optimum conditions exhibited a rejection of 95.6% to 2000 mg/L MgSO4 aqueous solution, a pure water flux of 7 L•m-2•h-1 and a salt rejection order of Na2SO4＞MgSO4＞NaCl＞MgCl2 when tested under 0.6 MPa. Moreover , the changes of morphology and contact angle showed that a polyamide active layer was formed on the substrate by interfacial polymerization.

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