▎ 摘　　要

NOVELTY - Magnetically recoverable graphene/titanium dioxide photocatalytic composite material preparation involves mixing and stirring nanometer ferroferric oxide dispersion and polyacrylic acid solution for 20-50 minutes to obtain polyacrylic acid modified ferroferric oxide solution. The formed tetraethyl titanate solution and graphene oxide solution mixed at 130-160 degrees C for 24-48 hours to obtain graphene or titanium dioxide photocatalytic material. The graphene or titanium dioxide dispersion and the polyethyleneimine solution are mixed for 20-50 minutes to obtain the polyethyleneimine modified graphene or titanium dioxide solution. USE - Method for preparing magnetically recoverable graphene or titanium dioxide photocatalytic composite material (claimed). ADVANTAGE - The method prepares the magnetically recoverable graphene or titanium dioxide photocatalytic composite material in a simple, cost-effective and eco-friendly manner with high visible light catalytic degradation activity, large photocatalytic surface, and effective recovery in a complex environment by regulating the self-assembly content of the ferroferric oxide. DETAILED DESCRIPTION - The obtained polyacrylic acid modified triiron tetroxide solution and the polyethyleneimine modified graphene/titanium dioxide solution are incubated at room temperature by using electrostatic self-assembly for 20-30 hours, and then centrifuged for preparing magnetic ferroferric oxide modified graphene/titanium dioxide composite material. The prepared magnetic ferroferric oxide modified graphene/titanium dioxide composite material is heat-treated to obtain the magnetically recoverable graphene/titanium dioxide photocatalytic composite material. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic scanning electron micrograph of the prepared graphene oxide.