▎ 摘　　要

NOVELTY - Preparing three-dimensional graphene-loaded zero-valent iron composite material, comprises (i) dissolving the iron salt in the graphite oxide dispersion liquid and stir thoroughly to obtain solution A, and (ii) dissolving the organic ligand in the organic solvent to obtain the solution B, then quickly adding the solution A into the solution B, after mixing uniformly, centrifuging and separating, cleaning the obtained filter residue, freezing and drying, then placing in a tubular furnace, heating at 600-1000 degrees C under the protection of inert gas for calcination, and cooling naturally to obtain final product, where in step (i), the concentration of the graphite oxide dispersion is 0.5-10 mg/l. USE - The method is useful for preparing three-dimensional graphene-loaded zero-valent iron composite material. ADVANTAGE - The method: utilizes organic-inorganic complex method to prepare nano zero valent iron, which realizes the high dispersion of nano zero valent iron, and three-dimensional graphene carrier, which has strong conductivity and porous structure, promotes the efficient transfer of electrons, and the rapid diffusion of nitrate; is simple and convenient to operate. The composite material: has high nitrate treatment efficiency and high nitrogen selectivity.