Preparation method and application of high-permeability and high-selectivity polyamide nanofiltration membrane

Abstract

The application belongs to the technical field of water treatment membranes, and relates to a preparation method and application of a high-permeability and high-selectivity polyamide nanofiltration membrane; during preparation, 3-aminopropyl triethoxysilane / tannic acid nanoparticles are first grown on the surface of a base film, then the treated base film is soaked in an amine solution containing keratin, taken out, dried, soaked in a uniform benzene triformyl chloride n-hexane solution, taken out again, and subjected to heat treatment to obtain the nanofiltration membrane; the water permeability of the nanofiltration membrane is 40.3-100.6 L / (m 2 ·h·bar), the rejection rate of sodium sulfate is 97.7-99.1%, the rejection rate of magnesium sulfate is 83.8-94.1%, the rejection rate of calcium sulfate is 80.5-91.3%, and the rejection rate of sodium chloride is 8.5-24.9%; the application is: used for desalination of seawater and brackish water, selective separation of monovalent anions and divalent anions in high-salt wastewater, and separation of a mixed system of antibiotic small-molecule organic matters and salts; the method is simple to operate, and has a wide application prospect.

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