▎ 摘　　要

NOVELTY - Preparing graphene-quaternary ammonium salt modified polyacrylonitrile composite fiber filter film involves adding graphene oxide to N,N-dimethylformamide solvent, stirring and dispersing, adding pyromellitic anhydride to carry out ring-opening reaction, centrifuging the product after cooling, repeatedly washing with absolute ethanol, and drying to obtain acid anhydride graphene. The acid anhydride graphene and 4-(2-hydroxyethoxy) benzophenone are added to the xylene solvent, stirred, transferred to an oil bath for ring-opening reaction, centrifuged, washed and dried the product to obtain benzophenonated graphene. The acrylonitrile and benzophenonated graphene are added to the toluene solvent, after ultrasonically dispersing evenly, transferred to an oil bath, passed nitrogen to remove oxygen in the system. The ultraviolet light source is used to irradiate the reaction system to carry out the reaction. USE - Method for preparing graphene-quaternary ammonium salt modified polyacrylonitrile composite fiber filter film used in clothes, carbon fiber raw material, hemodialysis and other fields. ADVANTAGE - The method improves filter efficiency of the composite fibre filter film and application range of the polyacrylonitrile fibre filter film, and endows the antibacterial and adsorption performance of heavy metal ion. DETAILED DESCRIPTION - Preparing graphene-quaternary ammonium salt modified polyacrylonitrile composite fiber filter film involves adding graphene oxide to N,N-dimethylformamide solvent, stirring and dispersing, adding pyromellitic anhydride to carry out ring-opening reaction, centrifuging the product after cooling, repeatedly washing with absolute ethanol, and drying to obtain acid anhydride graphene. The acid anhydride graphene and 4-(2-hydroxyethoxy) benzophenone are added to the xylene solvent, stirred, transferred to an oil bath for ring-opening reaction, centrifuged, washed and dried the product to obtain benzophenonated graphene. The acrylonitrile and benzophenonated graphene are added to the toluene solvent, after ultrasonically dispersing evenly, transferred to an oil bath, passed nitrogen to remove oxygen in the system. The ultraviolet light source is used to irradiate the reaction system to carry out the reaction. The product is filtered, washed and dried to obtain a graphene-modified polyacrylonitrile composite material. The graphene-modified polyacrylonitrile composite material and sodium hydroxide are added to the deionized water solvent, then transferred to a water bath for hydrolysis reaction after cooling. The product is repeatedly washed with deionized water until neutral, centrifuged and dried to obtain graphene-modified sodium carboxylate polyacrylonitrile. The cetyl benzyl dimethyl ammonium chloride is added to the deionized water solvent, stirred and dissolved completely, added graphene-modified sodium carboxylate polyacrylonitrile, ultrasonically dispersed, transferred to a water bath. The ion exchange reaction is carried out in the pot, and the product is washed and dried to obtain the graphene-quaternary ammonium salt modified polyacrylonitrile composite material. The graphene-quaternary ammonium salt modified polyacrylonitrile composite material is added to the N,N-dimethylformamide solvent, stirred and mixed, poured the mixed solution into the electrospinning device, and set the spinning electrospinning is performed after the parameters. The product is dried in an oven to obtain product.