▎ 摘　　要

NOVELTY - Preparing large-diameter graphene oxide based on scaly graphene involves putting graphite flakes and sodium nitrate into the reaction kettle, adding concentrated sulfuric acid at a temperature of 0-2 degrees C, stirring at a speed of 150-200r/min for 0.5-1h, then adding intercalation agent, after stirring for 1-1.5 hours, adding potassium permanganate, stirring at a speed of 300-350 r/min and a temperature of 10-15 degrees C for 3-5 minutes at a temperature of 35-40 degrees C, continue to stir for 3-5h to prepare a pre-oxidized graphene suspension. The deionized water is added to the pre-oxidized graphene suspension and stirred for 0.5-1 hours at a speed of 200-300r/min and a temperature of 90-95 degrees C. The hydrogen peroxide is added and continue stirring for 1 1.5 hours. The filtrate is removed by filtration, the filter cake is washed with dilute hydrochloric acid, and then washed with deionized water to a pH of 7. USE - Method for preparing large-diameter graphene oxide based on scaly graphene. ADVANTAGE - The agglomerated stack makes the large-diameter graphene oxide more stable and the yield is higher. The flocculant can quickly form flocs of impurities in graphene, and contains a large number of nitrogen arc electrons in the surface molecules of the flocculant. It can form multiple adsorption sites, has a fast sedimentation rate, is easy to separate from water, and is less corrosive to the equipment, making the quality of the prepared large-diameter graphene oxide better. DETAILED DESCRIPTION - Preparing large-diameter graphene oxide based on scaly graphene involves putting graphite flakes and sodium nitrate into the reaction kettle, adding concentrated sulfuric acid at a temperature of 0-2 degrees C, stirring at a speed of 150-200r/min for 0.5-1h, then adding intercalation agent, after stirring for 1-1.5 hours, adding potassium permanganate, stirring at a speed of 300-350 r/min and a temperature of 10-15 degrees C for 3-5 minutes at a temperature of 35-40 degrees C, continue to stir for 3-5h to prepare a pre-oxidized graphene suspension. The deionized water is added to the pre-oxidized graphene suspension and stirred for 0.5-1 hours at a speed of 200-300r/min and a temperature of 90-95 degrees C. The hydrogen peroxide is added and continue stirring for 1 1.5 hours. The filtrate is removed by filtration, the filter cake is washed with dilute hydrochloric acid, and then washed with deionized water to a pH of 7, and then dried to obtain a large-diameter graphene oxide crude product. The large-diameter crude graphene oxide and deionized water are put into the reaction kettle, and perform ultrasonic treatment for 1 to 1.5 hours at a frequency of 5-8MHz. The flocculant is added under ultrasonic treatment for 10-15 minutes, centrifuged at 8000r/min to remove the precipitate, and distilled the supernatant to obtain large-diameter graphene oxide.