▎ 摘　　要

NOVELTY - Preparing ferrosoferric oxide grafted polyethyleneimine-graphene composite adsorption material involves adding nano-ferrosoferric oxide to deionized water, placing it in an ultrasonic device and performing ultrasonic, until the dispersion is uniform, heating at 60-80 degrees C, adding oleic acid, stirring and reacting for 2-4 hours to prepare oleic acid modified nano-Fe3O4, adding oleic acid modified nano-Fe3O4 to deionized water, adding potassium permanganate after uniform ultrasonic dispersion, heating at 35-55 degrees C, and reacting for 4-8 hours to prepare carboxylated nano-Fe3O4, adding graphene oxide to deionized water, ultrasonically disperse uniformly, adding polyethyleneimine, pouring the solution into reaction kettle, heating at 120-160 degrees C, and reacting for 6-12 hours to prepare polyethyleneimine grafted graphene three-dimensional hydrogel, adding carboxylated nano Fe3O4 and polyethyleneimine grafted graphene three-dimensional hydrogel to deionized water. USE - Method for preparing ferrosoferric oxide grafted polyethyleneimine-graphene composite adsorption material. ADVANTAGE - The method has excellent chelate of absorbing andelectrostatic adsorption and nano Fe3O4 modified bychemical covalent bond, uniformly dispersed in thecomposite adsorption material, avoids agglomerationand aggregation, the composite adsorption material has excellent magnetic adsorption, magnetic separation and magnetic recovery effect. DETAILED DESCRIPTION - Preparing ferrosoferric oxide grafted polyethyleneimine-graphene composite adsorption material involves adding nano-ferrosoferric oxide to deionized water, placing it in an ultrasonic device and perform ultrasonic until the dispersion is uniform, heating at 60-80 degrees C, adding oleic acid, stirring and reacting for 2-4 hours to prepare oleic acid modified nano-Fe3O4, adding oleic acid modified nano-Fe3O4 to deionized water, adding potassium permanganate after uniform ultrasonic dispersion, heating at 35-55 degrees C, and reacting for 4-8 hours to prepare carboxylated nano-Fe3O4, adding graphene oxide to deionized water, ultrasonically disperse uniformly, adding polyethyleneimine, pouring the solution into reaction kettle, heating at 120-160 degrees C, and reacting for 6-12 hours to prepare polyethyleneimine grafted graphene three-dimensional hydrogel, adding carboxylated nano Fe3O4 and polyethyleneimine grafted graphene three-dimensional hydrogel to deionized water, after uniform ultrasonic dispersion, adding dehydrating agent and catalyst, and heating to 40-70 degrees C and reacting for 2-6 hours.