▎ 摘　　要

NOVELTY - The preparation method of graphene oxide and magnetic metal nanocomposite material involves using deionized water as solvent, uniformly mixing magnetic metal and graphite oxide to prepare mixed solution of magnetic metal salt and oxidized graphene, ultrasonically dispersing to prepare initial solution, placing in external magnetic field, heating, adding sodium hydroxide, adding sodium borohydride aqueous solution, reacting, using permanent magnets or centrifuge to separate solution and solid phase product, washing the solid phase product, and vacuum drying. USE - Preparation method of graphene oxide and magnetic metal nanocomposite material (claimed). ADVANTAGE - The method enables preparation of graphene oxide and magnetic metal nanocomposite material with mild reaction condition, by simple process. DETAILED DESCRIPTION - The preparation method of graphene oxide and magnetic metal nanocomposite material involves (1) using deionized water as solvent, uniformly mixing magnetic metal and graphite oxide in mass ratio of 25:1-1:1 to prepare mixed solution of magnetic metal salt and oxidized graphene, where the concentration of magnetic metal ion is 0.01-0.25 mol/l, and ultrasonically dispersing for 10-60 minutes to prepare initial solution, (2) placing the prepared initial solution in an external magnetic field of 5-50 mu T, heating at 45-95 degrees C, adding 0.5-2.5 mol/l sodium hydroxide, adding sodium borohydride aqueous solution with pH value of 12-14, reacting for 5-60 minutes, using permanent magnets or centrifuge to separate solution and solid phase product, washing the solid phase product 3 times using deionized water, anhydrous ethanol and acetone, vacuum drying, and collecting.