The invention discloses a method for functionalizing a
graphene oxide nanosheet and application of a
hybrid composite membrane constructed on the basis of the method. When
dopamine is subjected to oxidation self-
polymerization,
oxygen-containing groups on the surface of
graphene oxide are subjected to reduction, and the swelling resistance of the
hybrid membrane is improved. The thickness of the membrane is about 6 micrometers, the membrane is composed of a polyether-
polyamide block
copolymer matrix and
functionalized graphene filler, and the
mass fraction of the
graphene component in the filler ranges from 2% to 8%. The preparation process comprises the steps that polydopamine is subjected to oxidation self-
polymerization on the surface of the graphene
oxide nanosheet, graphene oxide is subjected to reduction, a
functionalized graphene nanosheet is obtained, the polyether-
polyamide block
copolymer matrix is filled with the
functionalized graphene nanosheet, the surface of a
polysulfone ultrafiltration membrane supporting layer is subjected to
spin coating with the functionalized graphene nanosheet, and the
composite membrane is obtained. The preparation process of the
composite membrane is simple, convenient and controllable, the obtained membrane is applied to the
pervaporation oil product desulfurizing process, and high separating property and swelling resistance are both achieved.