荷电纳滤膜研究进展

The Research and Development of Charged Nanofiltration Membranes

根据所带电荷性质不同,荷电纳滤膜可分为荷正电纳滤膜、荷负电纳滤膜和荷电镶嵌膜。所带电荷不同,其分离模型也不同,荷正(负)电纳滤膜的分离模型有Donnan模型、固定电荷模型、空间电荷模型、静电位阻模型和杂化模型等。荷电镶嵌膜主要通过离子交换进行分离。因此,荷电纳滤膜的分离具有较高的选择性。目前,国内外制作荷电纳滤膜的方法主要有L-S法、表面改性法、共混法和复合法几类,其中表面改性是最常用的方法。

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. difference of charged character causes the difference of separation. separating model positively （negstively）charged nanofiltration has Donnan model, fasten charge model, spatial steric hindrance model, electrostatic 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.