采用相转化的方法制备聚砜支撑层,在其表面进行界面聚合得到聚砜-聚酰胺正渗透复合膜。系统研究了聚砜浓度、溶剂比例、支撑层厚度对膜性能的影响,并且优化了测试条件(如:膜面流速、错流方向、原料液温度以及驱动液浓度)。结果表明,在聚砜含量为w=12%、NMP与DMF质量比为3∶1、刮膜厚度为150μm、膜面流速为2.47 cm/s、反向错流方式下,聚砜-聚酰胺正渗透膜性能为:FO模式下,水通量为12.69 L/(m~2·h),反向盐通量为5.55 g/(m~2·h);PRO模式下,水通量为21.48 L/(m~2·h),反向盐通量为9.18 g/(m~2·h)。此外,原料液温度升高和驱动液浓度增加有利于提高膜的性能。正渗透复合膜的形貌和表面粗糙度通过SEM和AFM进行表征。 The phase inversion method is adopted to prepare the polysulfone support layer, and the surface is subjected to interfacial polymerization to obtain the polysulfone-polyamide positive osmosis composite membrane. The effects of polysulfone concentration, solvent ratio, and thickness of support layer on membrane performance were systematically studied, and the test conditions (membrane velocity, cross-flow direction, temperature of feed solution, and concentration of drive solution) were optimized. The results showed that polysulfone-polyamide (PPS) was obtained under the conditions of polysulfone content w = 12%, NMP to DMF mass ratio 3:1, membrane thickness 150μm and membrane surface velocity 2.47 cm / s. The performance of the forward osmosis membrane was as follows: the water flux was 12.69 L / (m ~ 2 · h) and the reverse salt flux was 5.55 g / (m ~ 2 · h) in FO mode; 21.48 L / (m ~ 2 · h) and the reverse salt flux was 9.18 g / (m ~ 2 · h). In addition, the temperature of the starting material and the increase of the concentration of the driving liquid are favorable for improving the performance of the film. The morphology and surface roughness of the composite membrane being infiltrated were characterized by SEM and AFM.