▎ 摘　　要

NOVELTY - Preparation of large sheet-shaped graphene with high concentration of magnetic moment involves mixing graphite, sodium nitrate, potassium permanganate, and concentrated sulfuric acid, adding large number magnet into acid vessel, placing acid-resistant container in constant temperature water bath, stirring, adjusting temperature, stirring; adding diluted hydrogen peroxide solution or deionized water, adding diluted hydrogen peroxide solution and water; centrifuging precipitates, collecting precipitates, adding water; and adding water, stirring, taking upper layer, cleaning, and oven drying. USE - Method for preparing large sheet-shaped graphene with high concentration of magnetic moment (claimed). DETAILED DESCRIPTION - Preparation of large sheet-shaped graphene with high concentration of magnetic moment comprises selecting 8-12 wt.% natural flake graphite, 8-12 pts. wt. chemically pure sodium nitrate, 40-60 pts. wt. chemically pure potassium permanganate, and 300-500 ml chemically pure and analytically pure concentrated sulfuric acid, uniformly mixing, adding large number magnet into acid vessel, placing acid-resistant container in constant temperature water bath, stirring for 1.5 plus minus 1 hours at 0 plus minus 10 degrees C, quickly adjusting temperature to 35 plus minus 10 degrees C, stirring for 2 plus minus 1 hours; adding 300-500 ml diluted hydrogen peroxide solution or deionized water to obtain a mixture, adding 1500-3000 ml diluted hydrogen peroxide solution and water; centrifuging precipitates, collecting precipitates, adding 13-20 times water; and adding 2000 ml dilution water, stirring uniformly, taking upper layer, cleaning, and oven drying at 100 plus minus 20 degrees C. The graphene oxide has average size of 50-85 mu m, saturation magnetic moment of 1.2 emu/g, and magnetic moment of 5.