▎ 摘　　要

NOVELTY - Controllable water flux or retention rate graphene oxide/chitosan composite nanofiltration membrane is claimed. The composite nanofiltration membrane is composed of graphene oxide-chitosan nanosheets prepared by reaction of amide bonds as spacers embedded in graphene oxide sheets and stacking with graphene oxide sheets. The surface of the composite nanofiltration membrane is uneven, with folds and pores of different sizes. The graphene oxide-chitosan nanosheet is prepared by mixing 20 mg/ml chitosan solution having viscosity of 100-200 mpa.s and 4 mg/ml graphene oxide solution in a volume ratio of 1:1, placing it in a hydrothermal reactor, reacting at 120℃ for 12 hours and freeze-drying. USE - The graphene oxide/chitosan composite nanofiltration membrane is useful in preparation of water flux and nanofiltration performance equipment and textile dye wastewater treatment equipment (all claimed). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparation of controllable water flux or retention rate graphene oxide/chitosan composite nanofiltration membrane; and graphene oxide-chitosan nanosheet for preparation of controllable water flux or retention rate graphene oxide/chitosan composite nanofiltration membrane.