▎ 摘　　要

NOVELTY - Preparing a magnetic graphene composite material involves iron and zinc oxide nanocomposite particles. The solution of 3g zinc nitrate and 8g sodium hydroxide is dissolved in 20ml of deionized water to form solution 1. The solution 1 is prepared by adding 15ml of deionized water. The 75ml absolute ethanol, 15ml of 25% aqueous ammonia and 0.6g iron powder are added. The components are stirred at 25 degrees C for 20 minutes using a magnetic stirrer. The solution 2 is added to the polytetrafluoroethylene (PTFE)-lined reactor in the hydrothermal reaction at 100 degrees C for 24 hours to prepare solution 3. USE - Method for preparing a magnetic graphene composite material (claimed). DETAILED DESCRIPTION - Preparing a magnetic graphene composite material involves iron and zinc oxide nanocomposite particles. The solution of 3g zinc nitrate and 8g sodium hydroxide is dissolved in 20ml of deionized water to form solution 1. The solution 1 is prepared by adding 15ml of deionized water. The 75ml absolute ethanol, 15ml of 25% aqueous ammonia and 0.6g iron powder are added. The components are stirred at 25 degrees C for 20 minutes using a magnetic stirrer. The solution 2 is added to the polytetrafluoroethylene (PTFE)-lined reactor in the hydrothermal reaction at 100 degrees C for 24 hours to prepare solution 3. The solution 3 is centrifuged at 5000 revolutions per minute for 30 minutes to collect precipitate. The precipitate is washed with ion water and again centrifuged to obtain precipitate. The obtained precipitate is dried at 90 degrees C. The colloidal suspension of graphene oxide solution is prepared by mixing 20g of potassium permanganate into the mixture beaker at 35 degrees C for 2 hours. The 5g superfine graphite is added into 125ml concentrated sulfuric acid and mixed in ice bath for 30 minutes. The 10ml of deionized water is added at 80 degrees C for 15 minutes. The 5% hydrogen peroxide is added until no gas is generated to obtain filter cake. The filter cake is placed in drying oven at 60 degrees C for 24 hours to obtain graphite oxide. The graphite oxide is added into 400ml deionized water solution to obtain solution 4. The solution 4 is ultrasonically dispersed for 1 hour to prepare an oxidized graphene dispersion solution 5. The solution 5 is centrifuged in a high-speed centrifuge for 10 minutes to obtain a stabilized graphene suspension solution 6. The core-shell iron-zinc oxide nanocomposite fine particles prepared are added to the solution 6 to prepare a solution 7. The solution 7 is placed in drying oven at 60 degrees C for 24 hours to obtain graphene-iron-zinc oxide mixed sample. The obtained sample is placed in a tube furnace and nitrogen gas is introduced. The reaction temperature is 600 degrees C for 30 minutes. The temperature is lowered to 25 degrees C to obtain final product.