▎ 摘　　要

NOVELTY - Preparing magnetic aminated graphene oxide, comprises e.g. adding graphite powder, potassium persulfate and phosphorus pentoxide into concentrated sulfuric acid, reacting, cooling, adding ultra-pure water, washing and drying to obtain pre-oxidized graphite, preparing graphene aqueous solution, preparing ferric ion and ferrous ion mixed solution, adding graphene oxide solution, stirring, adjusting pH, cooling, separating precipitate, washing, obtaining magnetic graphene oxide suspension, adding ammonium hydroxide in magnetic graphene oxide suspension, adding diethylenetriamine, and reacting. USE - The method is useful for preparing magnetic aminated graphene oxide (claimed), which is used in electroplating plants, smelters, electronics factory and copper wastewater treatment plant. ADVANTAGE - Graphene oxide can effectively remove divalent copper ions in waste water. DETAILED DESCRIPTION - Preparing magnetic aminated graphene oxide, comprises loading nanophase materials of superparamagnetic zinc ferrite particle in the graphene oxide nano-sheet to prepare magnetic graphene oxide, then preparing magnetic aminated graphene oxide in diethylenetriamine grafted magnetic graphene oxide surface, carrying out solid-liquid separation and recycling the magnetic aminated graphene oxide, where the method specifically comprises (i) adding graphite powder, potassium persulfate and phosphorus pentoxide into 10-50 ml concentrated sulfuric acid and reacting at 50-100 degrees C for 2-8 hours, where the ratio of potassium persulfate and phosphorus pentoxide is 1:(0.5-2):(0.5-2), concentrated sulfuric acid mass concentration is 90-98%, then cooling to 20-40 degrees C, adding 800-1200 ml ultra-pure water, placing for 8-12 hours, washing the product to be neutral at 40-80 degrees C, and drying to obtain pre-oxidized graphite, (ii) adding pre-oxidized graphite in 200-300 ml concentrated sulfuric acid, then adding sodium nitrate and potassium permanganate, where the mass concentration of concentrated sulfuric acid is 90-98%, the mass ratio of sodium nitrate and potassium permanganate is 1:(0.5-2):(10-50), reacting for 2-6 hours at 0-5 degrees C, raising the temperature to 30-40 degrees C and reacting for 1-4 hours, adding 200-800 ml ultra-pure water, reacting for 1-6 hours at 80-100 degrees C, then adding 800-1200 ml ultra-pure water and 20-60 ml hydrogen peroxide with mass concentration of 20-30%, continuing to react for 1-6 hours to obtain the product, washing the product with hydrochloric acid solution with mass concentration of 5-15%, using water to wash until it is neutral, and ultrasonically dispersing for 1-4 hours at 30-60 degrees C, obtaining graphene aqueous solution with concentration of 1-10 mg/ml, (iii) at room temperature, with mol ratio of (1-3):1 of ferric ion and ferrous ion, dissolving in deoxygenated ultra pure water to obtain ferric ion and ferrous ion mixed solution, adding in graphene oxide solution, quickly stirring for 1-4 minutes at 70-95 degrees C water bath, then adding 300-600 ml aqueous ammonia to adjust the pH value to be 9-11, continuing to stir for 0.5-2 hours, cooling, separating the precipitate and washing, setting to a constant volume, obtaining magnetic graphene oxide suspension with concentration of 1-20 mg/ml, and (iv) adding 1-20 ml ammonium hydroxide into 500-2000 ml magnetic graphene oxide suspension, at room temperature, stirring for 1-10 minutes, then adding 20-60 ml diethylenetriamine, stirring for 5-20 minutes at room temperature of 60-100 degrees C, continuing to react for 2-10 hours, obtaining the product, using large amount of water and alcohol to wash until it is neutral, obtaining aminated magnetic oxide with concentration of 1-10 mg/ml. An INDEPENDENT CLAIM is also included for use of magnetic aminated graphene oxide in removing heavy metal ion in water, comprising taking divalent copper waste water, then adding electrolyte sodium chloride, sodium sulfate, and disodium hydrogen phosphate with mol concentration of 0.0001-0.1 mol/l, regulating pH value to 1-12, adding 0. 05-0.5g magnetic aminated graphene oxide into each liter of wastewater, placing in a constant temperature water bath and shaking at a speed of 50-300 revolutions/minute and reacting for 0-48 hours, controlling the the reaction temperature at 10-50 degrees C, after completion of the reaction, using magnet for magnetic separation of amination graphene oxide from the solution, and removing divalent copper in wastewater.