▎ 摘　　要

NOVELTY - Preparing nitrogen-doped reduced graphene oxide aerogel comprises using natural graphite powder as carbon source, preparing graphite oxide, adding in deionized water, and carrying out ultrasonic stripping to obtain graphite oxide aqueous solution; (ii) adding graphite oxide aqueous solution with hexamethylenetetramine crystals to obtain mixed liquid, heating, and cooling to obtain nitrogen-doped reduced graphene oxide hydrosol mixed solution; and (iii) allowing to stand the mixed solution, separating into upper and lower layers, removing upper layer, washing lower layer, freezing, and drying. USE - The aerogel is useful for water purifying agent, catalyst carrier and high-efficient composite material (claimed). ADVANTAGE - The aerogel has higher specific surface area, three-dimensional structure and excellent absorption performance. DETAILED DESCRIPTION - Preparing nitrogen-doped reduced graphene oxide aerogel comprises using natural graphite powder as carbon source, preparing graphite oxide, adding in deionized water, and carrying out ultrasonic stripping to obtain graphite oxide aqueous solution; (ii) adding the graphite oxide aqueous solution with hexamethylenetetramine crystals to obtain a mixed liquid, where the mass ratio of graphene oxide and hexamethylenetetramine is 4:1-2, heating the mixed solution in a fume bonnet at 70-90 degrees C for 2-4 hours under electromagnetic stirring condition, naturally cooling at room temperature to obtain nitrogen-doped reduced graphene oxide hydrosol mixed solution; and (iii) allowing to stand the hydrosol mixed solution for 3-5 hours, separating the mixed solution into upper and lower two layers, where the upper layer is aqueous solution, and the lower layer is concentrated nitrogen-doped reduction-oxidation graphene hydrogel mixed solution, removing the upper layer aqueous solution, washing the lower layer with deionized water, freezing and drying or supercritical drying to obtain the foam nitrogen-doped reduced graphene oxide aerogel.