▎ 摘　　要

NOVELTY - Preparation of high electromagnetic performance graphene/ferrite composite nano microsphere includes preparing graphene oxide using flake graphite powder as raw material, and synthesizing graphene/iron-manganese composite nanosphere by taking ethylene glycol, polyethylene glycol, ferric chloride hexahydrate, manganese acetate tetrahydrate, and sodium acetate or potassium acetate as starting material, dissolving polyethylene glycol in ethylene glycol by sonicating in water bath; adding graphene oxide solution, mechanically stirring, and adding ferric chloride and manganese acetate. USE - Method for preparing high electromagnetic performance graphene/ferrite composite nano microsphere (claimed) used for sewage treatment, energy, stealth and electronic fields. ADVANTAGE - The method is simple. The product has high specific surface area, good wave-absorbing properties, and light weight. DETAILED DESCRIPTION - Preparation of high electromagnetic performance graphene/ferrite composite nano microsphere comprises preparing graphene oxide using flake graphite powder as raw material; and synthesizing graphene/iron-manganese composite nanosphere by taking ethylene glycol, polyethylene glycol having molecular weight of 800-3000, ferric chloride hexahydrate, manganese acetate tetrahydrate, and sodium acetate or potassium acetate as starting material, where molar ratio of iron and manganese is 1:2, ferric chloride hexahydrate and ethylene glycol ratio is 1 g:10-40 ml, ferric chloride hexahydrate and polyethylene glycol ratio is 1 g:0.1-1 g, ferric chloride hexahydrate and acetate ratio is 1 g:1-10 g, and ferric chloride hexahydrate and graphene oxide ratio is 1 g:10-100 mg; dissolving polyethylene glycol in ethylene glycol by sonicating in water bath at 25-80 degrees C; adding graphene oxide solution, mechanically stirring to completely dissolve graphene oxide, adding ferric chloride and manganese acetate, dissolving, adding acetate, ultrasonically stirring for 1-3 hours, crystallizing at 160-200 degrees C, standing for 15-24 hours, magnetically separating to obtain black solid, repeatedly washing with deionized water and ethanol, vacuum drying at 80 degrees C; or synthesizing graphene/nickel ferrite composite nanosphere by taking deionized water, ferric nitrate nonahydrate, nickel nitrate hexahydrate, and urea as a starting material, where iron and nickel molar ratio is 1:2, ferric nitrate nonahydrate and deionized water ratio is 1 g:10-40 ml, ferric nitrate nonahydrate and urea ratio is 1 g:1-10 g, ferric nitrate nonahydrate and graphene oxide is 1 g:10-100 mg; dissolving graphene oxide in deionized water under ultrasonic condition in water bath at 25-80 degrees C to black solution, adding iron nitrate and nickel nitrate, dissolving, adding urea, ultrasonically stirring for 1-3 hours, crystallizing at 160-200 degrees C, standing for 15-24 hours, magnetic separating to obtain black solid, repeatedly washing with deionized water and ethanol, and vacuum drying at 80 degrees C.