| abstract |
The invention belongs to the technical field of nanofiltration membranes, and in particular relates to a composite nanofiltration membrane and a preparation method and application thereof. The composite nanofiltration membrane provided by the present invention includes a base layer, a base membrane layer and a polyamide separation layer that are stacked in sequence; the base membrane layer includes a polysulfone membrane and molybdenum disulfide oxide dispersed in the polysulfone membrane; The polyamide separation layer is prepared from an aqueous phase solution and an oil phase solution through in-situ interfacial polymerization; the aqueous phase solution contains piperazine, and the oil phase solution contains trimesoyl chloride. Molybdenum disulfide oxide has hydrophilicity and negative charge, which increases the efficiency of water passing through the composite nanofiltration membrane, and generates electrostatic repulsion between the surface of the composite nanofiltration membrane and pollutants, which improves the anti-pollution performance of the surface of the composite nanofiltration membrane. In the present invention, the polyamide separation layer obtained by the in-situ interface polymerization reaction has higher compactness, thereby improving the removal rate of the composite nanofiltration membrane. |