▎ 摘　　要

NOVELTY - Graphite powder and potassium permanganate as strong oxidizing agent are magnetically stirred. Strong acid is added and mixed. The mixture is irradiated with microwave, to obtain graphite oxide. Ice is added to obtained reaction mixture. The mixture is magnetically stirred and hydrolyzed. Hydrogen peroxide is added to graphite powder. The reaction mixture is precipitated, centrifuged and washed with hydrochloric acid, to obtain graphite oxide. The graphite oxide is ultrasonically peeled with deionized water and centrifuged, to obtain graphene oxide sol. USE - Microwave-assisted preparation of graphene oxide (claimed). ADVANTAGE - The method enables microwave-assisted preparation of graphene oxide with high yield and reproducibility, by simple method. DETAILED DESCRIPTION - Graphite powder and potassium permanganate as strong oxidizing agent are magnetically stirred at 800-2000 rpm. Strong acid is added and mixed. The graphite powder comprises flake graphite, natural graphite powder and/or expandable graphite. The content of potassium permanganate is 3-6 g with respect to 1 g graphite powder. The strong acid is concentrated sulfuric acid and concentrated phosphoric acid in ratio of 4:1. The concentrated sulfuric acid and concentrated phosphoric acid have concentration of more than 92%. The addition amount of acid is 30-100 ml with respect to 1 g graphite powder. The mixture is irradiated with microwave, to obtain graphite oxide. Ice is added to obtained reaction mixture. The content of ice is 40-150 ml with respect to 1 g graphite powder. The mixture is magnetically stirred at 500-1000 rpm, hydrolyzed at 80-100 degrees C for 30-70 minutes and magnetically stirred at 800-2000 rpm. Hydrogen peroxide is added to graphite powder. The content of 30% hydrogen peroxide is 0.2-2 ml with respect to 1 g graphite powder. The reaction mixture is precipitated, centrifuged and washed with 5-20 %mass hydrochloric acid. The precipitate is washed with deionized water such that the solution has pH of 5 or more and dried at less than 100 degrees C, to obtain graphite oxide. The graphite oxide is ultrasonically peeled with deionized water at 300-500 W for 1-4 hours. The content of deionized water is 10-350 ml with respect to 1 g graphite oxide. The graphite oxide is centrifuged to remove insoluble impurities, to obtain graphene oxide sol.