功能性中间层对聚酰胺膜水处理性能影响

Effect of Functional Interlayer onWater Treatment Performance of Polyamide Membrane

含聚酰胺层(PA)的复合膜自被发明以来,就广泛应用于纳滤(NF)、反渗透(RO)、正渗透(FO)等水处理领域。但是,聚酰胺膜的渗透性和选择性的相互制约使得对其的研究亟待产生新的突破。近年来,一种位于基膜和选择层之间的中间层成为膜制备研究的热点。这种中间层会影响聚酰胺层的形貌以及界面聚合过程,因而较先前的聚酰胺膜及纳米材料复合膜在通量及截留率方面均有一定提高,是解决目前聚酰胺膜渗透性和选择性矛盾的重要途径。综述了近年来有关中间层对聚酰胺膜水处理性能的影响和机理,介绍了基于有机涂层、纳米材料及二者结合的不同类型中间层的结构和性能,以及以此制备的聚酰胺膜的性能变化,为制备高性能的聚酰胺膜提供依据。

Since its invention,the composite membrane containing polyamide layer(PA)has been widely used in water treatment fields such as nanofiltration(NF),reverse osmosis(RO),forward osmosis(FO).However,the mutual restriction of permeability and selectivity of polyamide membrane makes it urgent to make a new breakthrough in its research.In recent years,an interlayer between the substrate membrane and the selective layer has become a research hotspot in membrane preparation.Such interlayer will affect the morphology of polyamide layer and the interfacial polymerization process.Therefore,compared with the previous polyamide membrane and nano material composite membrane,it has a certain improvement in flux and rejection.It is an important way to solve the contradiction between permeability and selectivity of polyamide membrane(Trade-off).This paper summarizes the influence and mechanism of interlayer on the water treatment performance of polyamide membrane in recent years,introduces the structure and performance of different types of interlayers based on organic coating,nano materials and their combination,as well as the performance changes of polyamide nanofiltration membrane,so as to provide a basis for the preparation of high-performance polyamide membrane.