Dopamine-polyethersulfone composite membrane and preparation method thereof

The invention discloses a preparation method of a dopamine-polyethersulfone composite membrane. The preparation method mainly comprises the following steps of: preparing a polyethersulfone basal membrane, sequentially soaking the polyethersulfone basal membrane in an aqueous phase monomer, namely dopamine and an organic phase monomer, namely trimesoyl chloride, and carrying out interfacial polymerization to prepare the dopamine composite membrane. Compared with a conventional polyethersulfone composite nanofiltration membrane prepared through the interfacial polymerization, the dopamine-polyethersulfone composite membrane has the advantages that as the dopamine is used as the aqueous phase monomer, the dopamine-polyethersulfone composite membrane shows excellent antioxidant capacity, for instance, after a polypiperazine-amide composite membrane is soaked for 4 days in 10ppm of sodium hypochlorite, the retention rate of the polypiperazine-amide composite membrane to orange sodium salt is reduced to 30.4% from 99.7%, and after the dopamine-polyethersulfone composite membrane is soaked for 4 days in 20ppm of sodium hypochlorite through experiments, the retention rate of the dopamine-polyethersulfone composite membrane to the orange sodium salt is reduced to 89.27% from 91.04%.