▎ 摘　　要

NOVELTY - Preparation of graphene having high purity and stable performance includes providing 4-8 pts. wt. potassium hydroxide, 50-70 pts. wt. expanded graphite, 10-14 pts. wt. threonine, 1-3 pts. wt. dioxane, 12-18 pts. wt. concentrated sulfuric acid, 21-25 pts. wt. concentrated nitric acid, 3-5 pts. wt. N-diethylhydroxylamine, 11-13 pts. wt. ethylene bis-stearamide, 3-5 pts. wt. N-methylformamide, 19-21 pts. wt. tetramethylammonium hydrogen carbonate, 1-3 pts. wt. 1-butyl-3-methylimidazolium bistrifluoromethyl sulfonimide salt, 1-3 pts. wt. octafluorocyclopentene, 0.1-0.3 pts. wt. toluene, 5-7 pts. wt. calcium hypochlorite, 1-5 pts. wt. hydrazine hydrate, and 12-16 pts. wt. naphthalenetetracarboxylic acid dianhydride. USE - Preparation of graphene. ADVANTAGE - The method provides graphene with high purity and stable performance. DETAILED DESCRIPTION - Preparation of graphene having high purity and stable performance comprises providing 4-8 pts. wt. potassium hydroxide, 50-70 pts. wt. expanded graphite, 10-14 pts. wt. threonine, 1-3 pts. wt. dioxane, 12-18 pts. wt. concentrated sulfuric acid, 21-25 pts. wt. concentrated nitric acid, 3-5 pts. wt. N-diethylhydroxylamine, 11-13 pts. wt. ethylene bis-stearamide, 3-5 pts. wt. N-methylformamide, 19-21 pts. wt. tetramethylammonium hydrogen carbonate, 1-3 pts. wt. 1-butyl-3-methylimidazolium bistrifluoromethyl sulfonimide salt, 1-3 pts. wt. octafluorocyclopentene, 0.1-0.3 pts. wt. toluene, 5-7 pts. wt. calcium hypochlorite, 1-5 pts. wt. hydrazine hydrate, and 12-16 pts. wt. naphthalenetetracarboxylic acid dianhydride, adding 6 pts. wt. potassium hydroxide to 60 pts. wt. expanded graphite, placing in ultrasonic dispersion machine, ultrasonically processing at 750 (no units given) for 2 hours to form graphene oxide suspension, adding 12 pts. wt. threonine, 2 pts. wt. dioxane, 4 pts. wt. diethylhydroxylamine, 12 pts. wt. ethylene bis-stearamide, 4 pts. wt. N-methylformamide and 20 pts. wt. tetramethylammonium hydrogen carbonate, putting in a centrifuge, centrifuging at 3200 revolutions/minute (rpm) for 20 minutes, keeping the temperature at 25 degrees C, obtaining graphene oxide colloid solution, adding 15 pts. wt. concentrated sulfuric acid and 23 pts. wt. concentrated nitric acid, putting in a stirrer and stirring at 300 rpm for 1 hour, keeping the temperature at 30 degrees C, obtaining mixed solution, adding the mixed solution in graphene oxide colloid solution, volatilizing water by the action of a dryer, obtaining graphene oxide colloid, adding 2 pts. wt. 1-butyl-3-methylimidazolium bistrifluoromethyl sulfonimide salt, 0.2 pts. wt. octafluorocyclopentene, 6 pts. wt. calcium hypochlorite and 14 pts. wt. naphthalenetetracarboxylic acid dianhydride into a centrifuge, centrifuging at 2000 rpm for 30 minutes, keeping the temperature at 75 degrees C to obtain the mixed solution, adding into graphene oxide colloid, heating at 90 degrees C, filtering, cooling to obtain graphene oxide, adding 3 pts. wt. hydrazine hydrate, stirring and heating the system until yellow flocculent graphene oxide black is suspended in the solution, cooling, filtering by 0.35 mu m filter, washing the filter cake, freeze drying for 48 hours, and obtaining graphene.