▎ 摘　　要

NOVELTY - Preparing phosphonic acid-modified graphene or phosphonate-modified graphene comprises (i) dissolving aminomethylphosphonate in solvent, controlling the temperature at -10 to 60 degrees C, adding sodium nitrite and acid, and stirring, (ii) adding graphene, reacting, recovering the solvent, and filtering to obtain phosphonate-modified graphene, and (iii) hydrolyzing phosphonate-modified graphene in alkaline solution to adjust pH to 3-4 to obtain phosphonic acid-modified graphene, where in step (1), aminomethylphosphonate is dimethyl aminomethylphosphonate, diethyl aminomethylphosphonate, diphenyl aminomethylphosphonate, diethyl 1-aminoethylphosphonate and/or O,O-diphenyl diphenylaminomethyl phosphonate. USE - The method is useful for preparing phosphonic acid-modified graphene or phosphonate-modified graphene. ADVANTAGE - The method is simple, has mild reaction conditions, high safety, low cost, and improved product stability.