纳滤膜
作者:admin发布时间:2022-03-03 22:02
纳滤膜
纳滤是一种介于超滤和反渗透之间的膜分离技术,纳滤膜的表面分离层有1nm左右的微孔结构,故被称为纳滤。
纳滤在其分离应用中表现出以下显著特征:
1、纳滤膜过程通常在常温下进行,无相变和化学反应,不破坏生物活性,适用于热敏感物质的分离、浓缩和纯化。
2、纳滤膜截留分子量介于反渗透膜和超滤膜之间,一般认为纳滤的截留分子量为200-1000,特别适宜分子大小在1nm以上的物质,例如乳糖、麦芽糖、抗生素、合成药剂等有机小分子物质。
3、纳滤膜大多为荷电膜,由于电荷效应,对离子具有选择性,即使在较低的操作压力下,仍然对二价及多价离子有较高的截留率,而对一价离子的截留率较低。
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