纳滤膜的改性研究进展

Research Progress of Nanofiltration Membrane Modification

近年来,纳滤(NF)膜以其独特的离子选择性和较低的工作压力越来越广泛地应用于水处理领域中,但膜通量和截留率低、抗污染性能差等问题严重制约了纳滤膜的发展与应用。膜改性可以改变纳滤膜的亲水性、表面电荷和光滑程度,提高膜性能,是当今研究重点。本文对近几年来国内外纳滤膜改性进行了综述,将纳滤膜的改性效果归纳为提升渗透性能、分离性能和抗污染性能,并分析了涂覆法、接枝法和共混法三种改性方法的优点和局限性,最后对未来的改性研究趋势进行了展望。

In recent years,nanofiltration(NF)membranes have been more and more widely used in the field of water treatment due to their unique ion selectivity and low working pressure.However,problems including low membrane flux,low rejection rate and poor anti-pollution performance have severely restricted the development and application of nanofiltration membrane.Membrane modification can change the hydrophilicity,surface charge and smoothness of nanofiltration membranes to improve membrane performance,which is the focus of current research.In this article,the modification of nanofiltration membranes at home and abroad in recent years was reviewed,the modification effect of nanofiltration membranes was summarized from the aspects of improving permeability,improving separation performance and improving anti-pollution performance,and the advantages and limitations of the three modification methods of coating method,grafting method and blending method were analyzed.Finally,the future research trend of modification was prospected.