In recent years,most of the substrate materials for water filtration are nanofiltration membranes(NF)because they have lower cost and higher water permeability compared to reverse osmosis membranes(RO).However,in the actual application process,NF permeation rate,anti-pollution rate and life span decline may occur due to different use environment,so the choice of membranes with longer life span,stronger anti-pollution line and permeation rate has become a hot research topic in recent years.In this paper,the types of filtration membranes were introduced,the research on the modification of support layer and functional layer of filtration membranes was discussed,and its development direction was put forward.
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