▎ 摘　　要

NOVELTY - Preparation of ion-graphene oxide decolorizer involves (1) mixing 0.5 g graphene powder and 0.5 g sodium nitrate, adding 20-25 mL concentrated sulfuric acid, stirring for 10-20 minutes in an ice-water mixed liquid bath environment at 0-2°C, adding 4 g potassium permanganate, (2) dissolving the graphene oxide film in deionized water, where the dissolution ratio is 7-8 g, stirring for 30-40 minutes, then ultrasonically treating for 60-70 minutes in a water bath environment at 20-25℃, uniformly dispersing graphene oxide in deionized water to obtain graphene oxide suspension,(3) preparing 0.1-0.3 mol/L high-valent metal salt solution, mixing the graphene oxide suspension with the metal salt solution at a volume ratio of 3:20 to obtain a mixed solution, and then drying the mixed solution in the air, and drying at 30-50℃ in an oven. USE - Preparation of ion-graphene oxide decolorizer. ADVANTAGE - The method is rapid and simple, and enables preparation of ion-graphene oxide decolorizer capable of achieving efficient sewage decolorization. DETAILED DESCRIPTION - Preparation of ion-graphene oxide decolorizer involves (1) mixing 0.5 g graphene powder and 0.5 g sodium nitrate, adding 20-25 mL concentrated sulfuric acid, stirring for 10-20 minutes in an ice-water mixed liquid bath environment at 0-2℃, adding 4 g potassium permanganate, stirring for 30-40 minutes in an ice-water mixture bath at 0-2℃, then moving to a water bath at 40°C, stirring for another 90-100 minutes, adding 50 mL deionized water, stirring at room temperature for 10-20 minutes, adding 6 mL hydrogen peroxide with a concentration of 29-32%, then adding 50 mL deionized water, then washing with deionized water until the pH value is 6.9-7.2, then placing in a drying oven at 40-45℃, drying for more than 24 hours to form a graphene oxide film, (2) dissolving the graphene oxide film in deionized water, where the dissolution ratio is 7-8 g, stirring for 30-40 minutes, then ultrasonically treating for 60-70 minutes in a water bath environment at 20-25℃, uniformly dispersing graphene oxide in deionized water to obtain graphene oxide suspension, and (3) preparing 0.1-0.3 mol/L high-valent metal salt solution, mixing the graphene oxide suspension with the metal salt solution at a volume ratio of 3:20 to obtain a mixed solution, and then drying the mixed solution in the air, and drying at 30-50℃ in an oven.