▎ 摘　　要

NOVELTY - Preparing graphene composite involves dispersing glucose, maltodextrin and sodium chloride in deionized water ultrasonically to obtain a uniform dispersion whose pH level is adjusted between 8-11 by adding pH regulator to obtain a 1-15 g/L of mixed solution. Glucose, maltodextrin and sodium chloride are mixed in weight ratio of 10-20:2-5:0.5-1. The mixed solution is transferred into a 100 mL polytetrafluoroethylene lined reaction kettle and heated to 95-150 degrees C for 2-10 hours and then quickly cooled down to room temperature and dried at 72-85 degrees C to obtain a black powder material. USE - Method for preparing graphene composite (claimed). ADVANTAGE - The method enables to prepare graphene composite in a feasible manner which is suitable for mass production. The prepared graphene composite material has good conductivity, stable performance which is suitable for optical catalysis, electric catalysis and electrode material fields. DETAILED DESCRIPTION - Preparing graphene composite involves dispersing glucose, maltodextrin and sodium chloride in deionized water ultrasonically to obtain a uniform dispersion whose pH level is adjusted between 8-11 by adding pH regulator to obtain a 1-15 g/L of mixed solution. Glucose, maltodextrin and sodium chloride are mixed in weight ratio of 10-20:2-5:0.5-1. The mixed solution is transferred into a 100 mL polytetrafluoroethylene lined reaction kettle and heated to 95-150 degrees C for 2-10 hours and then quickly cooled down to room temperature and dried at 72-85 degrees C to obtain a black powder material. The black powder material is heated to 1500-2300 degrees C in an atmosphere of 75% nitrogen and 25% argon for 1-4 hours then rapidly cooled down to room temperature to obtain a product which is mixed with 98% sulfuric acid and is ultrasonically dispersed for 30 minutes under the conditions of 160 watts ultrasonic power in water bath at 0-5 degrees C followed by the addition of certain amount of high manganese potassium persulfate and ammonium persulfate. The mixture is dispersed for 15 minutes. The reaction system is slowly heated to 75-95 degrees C for 40 minutes and then reduced to room temperature and mixed with certain amount of deionized water. The mixture is ultrasonically dispersed for 50 minutes followed by the addition of hydrogen peroxide and ultrasonically dispersing for 30 minutes. The solution is filtered. The residue is washed until neutral to obtain a product which is again dispersed in deionized water for 30 minutes to obtain a 0.5-10 mg/L of solution followed by the addition of metal salt, ascorbic acid, sodium hydroxide, glycol and polyethyleneimine in weight ratio of 1:0.2-0.3:1-4:0.1-0.3:25-60:3-10. The reaction system is heated to 50 degrees C with stirring for 15 minutes to obtain a precursor solution. The metal salt is selected from nitrate, sulfate, phosphate, carboxylate or hydroxide salt of iron, nickel, cobalt, copper, zinc, chromium or indium. The precursor solution is heated in microwave reactor at 120-180 degrees C for 25-150 minutes. The resulting solution is cooled down to room temperature and washed for 3-5 times with ethanol and deionized water. The product is freeze dried to obtain desired graphene composite material.