▎ 摘　　要

NOVELTY - A graphene/cobalt ferrite/polyaniline composite wave-absorbing material (I) is prepared by preparing graphene using multi-walled carbon nanotubes as raw material; preparing cobalt ferrite via sol-gel self-propagating combustion method using cobalt nitrate hexahydrate and ferric nitrate nonahydrate as raw materials; and subjecting the graphene, cobalt ferrite and aniline monomer into in-situ polymerization to obtain the composite wave-absorbing material (I). USE - Method for preparing graphene/CoFe2O4/polyaniline composite wave-absorbing material (I) (claimed) used in the field of microwave absorption and electromagnetic shielding. ADVANTAGE - The method can provide graphene/CoFe2O4/polyaniline composite wave-absorbing material (I) having good conductivity, magnetic property and stability. DETAILED DESCRIPTION - A graphene/cobalt ferrite (CoFe2O4)/polyaniline composite wave-absorbing material (I) is prepared by: (1) adding 6 g multi-walled carbon nanotubes (with 30-50 nm diameter) into 400 mL concentrated sulfuric acid, standing for 24 hours, adding with 10 g potassium permanganate, stirring at room temperature for 1 hour, subjecting into ultrasonic treatment at 55 degrees C for 30 minutes, adjusting the temperature to 70 degrees C and continuing the ultrasonic treatment for 30 minutes, cooling to room temperature, pouring into 1.5 L ice water, adding with 200 mL hydrogen peroxide (H2O2), standing for 24 hours, removing the supernatant liquid, centrifuging, vacuum drying at 50 degrees C to obtain graphene oxide, adding with small amount of deionized water, subjecting into ultrasonic treatment for 30 minutes, adding with 300 mL ammonia water and 300 mL hydrazine hydrate, refluxing using reflux condenser, heating in water bath at 95 degrees C, reacting for 1 hour, introducing into distillation device to distill the residual ammonia water, subjecting into centrifugal separation, vacuum drying at 50 degrees C, and grinding to obtain graphene product; (2) dissolving 4 g cobalt nitrate hexahydrate (Co(NO3)2.6H2O) and 11.3 g ferric nitrate nonahydrate (Fe(NO3)3.9H2O) in deionized water, slowly pouring into 7.68 g citric acid solution, magnetically stirring for 10 minutes, adjusting the pH to 7 using ammonia water, slowly adding with 2 g polyethylene glycol solution, electromagnetically stirring for 2 hours, aging at room temperature for 12 hours, continuously stirring and heating in water bath at 80 degrees C for 3 hours to form sol, continuously heating and dehydrating to form gel, subjecting into self-propagating combustion, grinding, precalcining at 450 degrees C for 2 hours, calcining at 850 degrees C for 2 hours, cooling, and grinding to obtain CoFe2O4; and (3) adding 0.02-0.4 g graphene and 0.02-0.4 g CoFe2O4 into 20 mL hydrochloric acid solution having a concentration of 1 mole/L, subjecting into ultrasonic treatment for 1 hour, adding with 0.5-0.9 mL aniline monomer, placing in ice water bath and stirring for 10 minutes, continuously stirring and slowly adding with 10 mL ammonium persulfate solution having a concentration of 1 mole/L, continuously stirring for 3 hours, filtering, washing the filter cake with deionized water for 3-4 times, and vacuum drying at 60 degrees C for 10 hours to obtain the composite wave-absorbing material (I).