▎ 摘　　要

NOVELTY - The preparation method of magnetic graphene aerogel involves dissolving graphite oxide in deionized water and ultrasonically dispersing to form 1-8 mg/ml uniform graphene oxide solution, then adding dopamine and iron salt comprising ferric nitrate, ferric chloride and ferric sulfate to obtain enriched graphene solution, magnetically stirring and hydrothermally reacting at 100-160 degrees C for 6-24 hours to obtain graphene hydrogel, freeze-drying graphene hydrogel to obtain freeze-dried sample, heat-treating freeze-dried sample in oxygen-free environment. USE - The method is useful for preparing magnetic graphene aerogel, which is useful in water treatment, photovoltaic material and microwave absorbing material. ADVANTAGE - The method enables simple and economical preparation of magnetic graphene aerogel material with low density, large specific surface area and excellent stability, magnetic performance, mechanical performance, high temperature resistance, absorption performance, electrical conductivity and microwave absorbing performance. DETAILED DESCRIPTION - The preparation method of magnetic graphene aerogel involves dissolving graphite oxide in deionized water and ultrasonically dispersing to form 1-8 mg/ml uniform graphene oxide solution, then adding 0.5-1.5 mg/ml dopamine and iron salt comprising ferric nitrate, ferric chloride and ferric sulfate to obtain 0.1-20 mg/ml enriched graphene solution, magnetically stirring and hydrothermally reacting at 100-160 degrees C for 6-24 hours to obtain graphene hydrogel, freeze-drying graphene hydrogel to obtain freeze-dried sample, heat-treating freeze-dried sample at rate of 1-10 degrees C/minute to 800-1000 degrees C for 1-6 hours in oxygen-free environment.