PDM/PES纳滤膜的制备及其性能研究

Preparation and properties of PDM/PES nanofiltration membrane

为提高聚甲基丙烯酸-N,N-二甲氨基乙酯(PDM)纳滤膜的制备效率,以PDM为表层材料、高活性1,4-二溴-2-丁烯为交联剂、聚醚砜(PES)超滤膜为基膜,通过界面季铵化交联反应制备了PDM/PES复合纳滤膜。对PDM乙醇溶液浓度、涂层时间、1,4-二溴-2-丁烯环己烷溶液浓度以及交联时间等制膜工艺条件对纳滤膜性能的影响进行了研究,并采用XPS、SEM等分析技术对膜结构进行了表征。结果表明,在PDM乙醇溶液质量分数为1%、1,4-二溴-2-丁烯/环己烷质量分数为0.5%、涂层时间为3 min、交联时间为30 min的条件下能够制备出性能优异的纳滤膜,该膜对水溶液中MgSO_(4)盐溶液的截留率为93.1%,水通量为8.9 L/(m^(2)·h)。

In order to improve the preparation efficiency of poly(N,N-dimethylaminoethyl methacrylate)(PDM)nanofiltration membrane,PDM/PES composite nanofiltration membrane is prepared through interfacial quaternary amination reaction by using PDM as membrane surface material,1,4-dibromo-2-butene with a high activity as crosslinking agent and polyethersulfone(PES)ultrafiltration membrane as membrane substrate.The effects of membrane preparation parameters,including concentration of PDM ethanol solution,coating time,concentration of 1,4-dibromo-2-butene cyclohexane solution and crosslinking time,on the performance of nanofiltration membrane are studied.The structure of nanofiltration membrane is characterized by means of XPS and SEM.It is shown that nanofiltration membrane with excellent performance can be obtained when the concentration of PDM ethanol solution is 1wt%,the concentration of 1,4-dibromo-2-butene cyclohexane solution is 0.5 wt%,coating time is 3 min and crosslinking time is 30 min.The rejection rate of the membrane for MgSO_(4) is 93.1%,and the water flux is 8.9 L/(m^(2)·h).