| abstract |
The invention discloses a high flux-high cut-off composite membrane, comprising a porous polymer base membrane and a separation layer, characterized in that: an ultrafiltration membrane with a surface pore size of about 10-100 nanometers of The layer is a cross-linked polyamide layer containing amine-based polymer particles, the thickness of the separation layer is 50-300 nm, and the diameter of the amine-based polymer particles contained in the separation layer is 20-80 nm. Under the transmembrane pressure difference of 0.5 MPa, the pure water flux of the obtained composite membrane can reach 220 liters per square meter hour, and the rejection of sodium sulfate can reach more than 99.0%. The present invention also relates to a preparation method of the high flux-high cut-off composite membrane. The composite membrane can be used in nanofiltration and reverse osmosis processes, such as drinking water treatment, seawater desalination, industrial wastewater treatment, and biomedical separation. |