▎ 摘　　要

NOVELTY - Preparation of glycine modified graphene oxide/graphitic-carbon nitride composite film involves adding graphene oxide solution to water, stirring, ultrasonically dissolving to obtain aqueous graphene oxide solution, dissolving carboxyl activator in water, stirring, adding aqueous graphene oxide solution, stirring to obtain reaction liquid (a), dissolving glycine in water, stirring to obtain aqueous glycine solution, adding glycine aqueous solution to reaction liquid (a), stirring to obtain reaction liquid (b), adding graphitic-carbon nitride dispersion to reaction liquid (b), ultrasonically dispersing to obtain glycine-modified graphene oxide/graphitic-carbon nitride mixed dispersion, filtering mixed dispersion under certain degree of vacuum and depositing on cellulose base film to form glycine-modified graphene oxide/graphitic-carbon nitride composite film, and subjecting composite film to surface modification treatment with hyperbranched polyethyleneimine aqueous solution. USE - Preparation of composite film used for membrane separation of dye wastewater. ADVANTAGE - The method enables preparation of composite film having excellent penetrating ability and retention performance for dye/water system. DETAILED DESCRIPTION - Preparation of glycine modified graphene oxide/graphitic-carbon nitride composite film involves adding 100-500 ppm graphene oxide solution to water, stirring, ultrasonically dissolving to obtain aqueous graphene oxide solution, dissolving carboxyl activator in water, stirring until completely dissolved, adding aqueous graphene oxide solution, stirring for 15-30 minutes to obtain reaction liquid (a), dissolving glycine in water, stirring until completely dissolved to obtain 0.5-2 g/mL aqueous glycine solution, adding glycine aqueous solution to reaction liquid (a), stirring for 12-24 hours to obtain reaction liquid (b), adding graphitic-carbon nitride dispersion to reaction liquid (b), ultrasonically dispersing to obtain glycine-modified graphene oxide/graphitic-carbon nitride mixed dispersion, filtering mixed dispersion under certain degree of vacuum and depositing on cellulose base film to form a glycine-modified graphene oxide/graphitic-carbon nitride composite film, and subjecting composite film to surface modification treatment with a hyperbranched polyethyleneimine aqueous solution. The volume ratio of glycine solution to graphene oxide solution is 0.3-1:1. The concentration of the graphitic-carbon nitride dispersion is 100-250 ppm. The volume ratio of graphitic-carbon nitride dispersion and aqueous solution of graphene oxide is 0.5-1:1.