▎ 摘　　要

NOVELTY - The method for producing oxidized graphene/sodium alginate composite material, involves adding natural graphite, anhydrous sodium nitrate and sulfuric acid, slowly adding potassium permanganate, adding distilled water, adding hydrogen peroxide, washing reaction solution with hydrochloric acid and distilled water, adding barium chloride, ultrasonically processing to obtain graphene oxide suspension, adding graphene oxide suspension, adding sodium alginate, crosslinking calcium chloride solution, washing with distilled water and drying to obtain final product. USE - Method for producing oxidized graphene/sodium alginate composite material (claimed). ADVANTAGE - The method enables production of oxidized graphene/sodium alginate composite material with improved mechanical properties and low production cost, by simple synthesis process under mild reaction condition. DETAILED DESCRIPTION - Method for producing oxidized graphene/sodium alginate composite material, involves adding 7 g natural graphite, 3.5 g anhydrous sodium nitrate and 115 mL concentrated sulfuric acid, mixing evenly in magnetic stirrer, stirring for 30-40 minutes, slowly adding 20 g potassium permanganate for 1.5-2 hours, placing the obtained solution in ice water bath at 35-40 degrees C, continuing the reaction for 30-40 minutes, adding 210-220 mL distilled water to beaker under the condition of rapid stirring, controlling the reaction temperature at 80-85 degrees C, stirring for 15 minutes, diluting the reaction solution with distilled water and adding 3-5 %mass hydrogen peroxide to suspension to obtain golden yellow color, washing the reaction solution for 5 times with 5% hydrochloric acid and distilled water, centrifuging, until the oxidized graphite water dispersion is neutral, adding barium chloride until no white precipitation occurs, finally, ultrasonically processing prepared graphite oxide for 1 hour at frequency of 60 kHz to obtain graphene oxide suspension, adding 2.5-4 mL graphene oxide suspension to beaker, diluting with distilled water, adding 3 g sodium alginate, stirring at high-speed for 1 hour, ultrasonically processing for 0.5 hour, leaving still for 2 hours at room temperature, calcining at 40 degrees C for 24 hours, removing the solvent, crosslinking 5% concentration of calcium chloride solution for 30 minutes to remove the membrane, washing with distilled water and drying to obtain oxidized graphene/sodium alginate composite material.