Nanofiltration (NF) is a novel type of pressure-driven filtration process with membranes whose molecular weight cut-off (MWCO) lie between reverse osmosis membranes and ultrafiltration membranes

i.e. range between200and 1000g/mol

and NF membranes have nanopore radius (10

-9

m)

so the selection of membranes material and preparation technique become the key to manufacture NF membranes with high properties. In this paper

several of main preparation techniques of polymeric NF membranes including L-S phase separation way

transition way

co-blending way

charging way and composite way were introduced

the research on the material

preparation methods of polymeric nanofiltration membranes and its performance and application in recent years were also reviewed.