▎ 摘　　要

NOVELTY - Aerogel composite material comprises carbon nitride, reduced graphene oxide aerogel and magnetic materials. USE - Aerogel composite material used in photocatalyst for the degradation of microcystin (claimed). ADVANTAGE - The aerogel composite material has excellent physicochemical property, wide absorption range of visible light, good degradation effect of microcystin. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing an aerogel composite material, which involves dispersing carbon nitride and magnetic material in a solvent, mixing uniformly to obtain a suspension, to obtain a mixed powder after removing the solvent, dispersing the mixed powder and graphene oxide in a solvent to react for 8-16 hours and freeze-drying to obtain an aerogel composite material.; and (2) a method for using aerogel composite material, which involves adding aerogel composite material to the microcystin-LR solution to obtain a mixed solution, placing mixed solution in a photochemical reactor for dark adsorption equilibrium, using visible light to irradiate the mixed solution.