▎ 摘　　要

NOVELTY - A graphene foam-loaded nano-iron(II,III) oxide magnetic particle composite absorbing material has graphene foam porous structure as a carrier, and iron(II,III) oxide magnetic particles with particle size of 150-300 nm, which are anchored in the graphene foam porous structure. USE - Graphene foam-loaded nano-iron(II,III) oxide magnetic particle composite absorbing material. ADVANTAGE - The graphene foam-loaded nano-iron(II,III) oxide magnetic particle composite absorbing material has deep absorption intensity, wide absorption frequency bandwidth, lightweight, excellent mechanical properties and excellent performance, and meets wide range of product needs. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing graphene foam-loaded nano-iron(II,III) oxide magnetic particle composite absorbing material, which involves (I) adding flake graphite and strong oxidant in a mass ratio of 1:3 to strong acidic solution in an ice-water bath 0-10 ? environment, stirring and mixing for 40-60 minutes where 23 ml strong acidic solution is added for every 1 g flake graphite, increasing the system temperature to 35-40 degrees C, stirring for 3-4 hours, adding deionized water where the volume of deionized water is 2-3 times of strong acidic solution, then increasing the system temperature to 90-95 degrees C and reacting for 30-40 minutes, dripping deionized water and hydrogen peroxide where the volume of deionized water and hydrogen peroxide is 2-3 times and 0.5-1 times the volume of strong acid solution respectively, then performing static stratification, taking out the graphite oxide suspension, then pickling and washed until pH reaches 6-7, finally carrying out ultrasonic treatment to obtain graphene oxide colloidal suspension with concentration of 2.5-5 mg/mL, (ii) ultrasonically mixing the graphene oxide colloidal suspension with polyvinyl alcohol, injecting ferrous ion salt solution under the protection of inert gas to obtain a mixed solution where the mass concentration ratio of graphene oxide, polyvinyl alcohol and ferrous ions in mixed liquid colloidal suspension is 1:2-5:10-30 mg/mL, then adding alkaline solution to adjust the pH to 10-13, mixing into a reactor, reacting in a closed environment at 120-200 degrees C for 4-12 hours, then performing solid-liquid magnetic separation, washing the separated solid with water, and freeze-drying to obtain the product.