▎ 摘　　要

NOVELTY - Preparing magnetic nanoparticle loaded graphene hollow microsphere comprises preparing graphene oxide, deionized water, liquid alcohol, polyvinyl alcohol and metal salt into a reaction liquid, taking oil into a reaction container, heating in a water bath, adding the reaction liquid in a drop wise manner, stirring, heating in a water bath, stirring, filtering the reaction liquid, washing with deionized water, vacuum drying to obtain metal salt loaded graphene oxide hollow microsphere precursor, heating under protective atmosphere, sintering and cooling to room temperature. USE - The magnetic nanoparticle loaded graphene hollow microsphere is useful in electromagnetic wave absorption material. ADVANTAGE - The magnetic nanoparticle loaded graphene hollow microsphere: has high magnetic particle binding strength; ensures uniform loading of magnetic particles on graphene; does not cause magnetic particle agglomeration problem; has high specific surface area and high density; can adjust magnetic and electrical properties; has high electromagnetic properties. DETAILED DESCRIPTION - Preparing magnetic nanoparticle loaded graphene hollow microsphere comprises (a) taking 30-80 mg graphene oxide, 6-10 ml deionized water, 12-22 ml liquid alcohol, 100-300 mg polyvinyl alcohol and 200-500 mg metal salt, and preparing into a reaction liquid, (b) taking 150-250 ml oil into a reaction container, heating in a water bath at 60-75 degrees C, adding the reaction liquid of the step (a) in a drop wise manner, stirring for 5-10 minutes, stirring at a speed of 500-1000 revolutions per minute for 3-5 hours, stirring at stirring speed of 5000-6000 revolutions per minute, heating in a water bath at 90-100 degrees C, stirring for 3-5 hours, filtering the reaction liquid, washing with deionized water, vacuum drying to obtain metal salt loaded graphene oxide hollow microsphere precursor, and (c) heating to 300-800 degrees C at a rate of 1-10 degrees C/minute under protective atmosphere, sintering for 0.5-4 hours and cooling along with the furnace to room temperature.