The Research and Development of Charged Nanofiltration Membranes

Charged nano-filtration is classified three sorts according to its charged character,that is positively charged nano-filtration、negatively charged nano-filtration and charge mosaic membrane.The difference of charged character causes the difference of separation.The separating model of positively(negatively)charged nanofiltration has Donnan model,fasten charge model,spatial steric hindrance model,electro-static hindrance model,hybrid model.Charge mosaic membrane separates substance with exchanging cell.So,charged nano-filtration has favorable separating capability.At present the method of making charged nano-filtration has L-S、surface modification、blend、composite,and so on.The surface modification is used widely.