CPC B01D 71/82 (2013.01) [B01D 63/067 (2013.01); B01D 67/002 (2013.01); B01D 67/0004 (2013.01); B01D 67/0093 (2013.01); B01D 69/02 (2013.01); B01D 69/12 (2013.01); B01D 71/40 (2013.01); B01D 2313/40 (2013.01); B01D 2313/44 (2013.01); B01D 2323/36 (2013.01); B01D 2323/39 (2013.01); B01D 2325/022 (2013.01); B01D 2325/14 (2013.01); B01D 2325/16 (2013.01)] | 24 Claims |
1. A fibrous membrane comprising:
at least one single substrate layer comprising at least 80% by weight of microfibers, said single substrate layer carrying both positively charged and negatively charged functional groups, and
at least one layer of filtration material attached to the substrate layer, wherein the layer of filtration material comprises at least 80% by weight of nanofibers wherein said nanofibers are amine-based polymer selected from polyacrylonitrile (PAN) or chitosan, and are functionalized to carry negatively charged and positively charged functional groups within the layer of filtration material after said polymer reacting, respectively, with an alkylating agent and quaternary ammonium compound.
|