▎ 摘　　要

NOVELTY - Method for preparing carbon quantum dot cross-linked graphene oxide composite film, involves uniformly mixing carbon quantum dots with graphene oxide, depositing the uniform mixed dispersion liquid to support layer in pressure-assisted self-assembly manner, forming separation layer, and performing washing, heat treatment and drying treatment to obtain carbon quantum dot cross-linked graphene oxide composite film, where the carbon quantum dots in uniform mixed dispersion of carbon quantum dots and graphene oxide are 2-50 %mass based on total mass of graphene oxide. USE - Method for preparing carbon quantum dot cross-linked graphene oxide composite film used for dehydration of pervaporation butanol-water solution system (all claimed). ADVANTAGE - The hydrophilic functional groups on surface of carbon quantum dots accelerate the selective transport of water molecules, the cross-linking effect with graphene oxide sheet enhances the stability of membrane structure, is simple, and the prepared composite membrane is applied to the pervaporation butanol-water solution system, has high permeation flux and selectivity to water molecules, excellent long-term operation stability, is prepared by simple and easy-to-operate pressure-assisted self-assembly method, expands the interlayer nanochannel size, and improves the permeability of membrane.