▎ 摘　　要

NOVELTY - Preparing graphene air filter core in large quantity, comprises, (i) mixing graphite and potassium permanganate, then adding concentrated sulfuric acid and concentrated phosphoric acid, and reacting under heating condition of 60-90 degrees C for 5-8 hours, (ii) adding ice cubes into the mixed solution prepared in step (i), (iii) adding hydrogen peroxide solution into the reaction product prepared in step (ii), (iv) repeatedly centrifuging and rinsing the product prepared in step (iii) with water and ethanol for 3-5 times, (v) forcibly cooling the solution by using liquid nitrogen or solid carbon dioxide, and (vi) reacting the product prepared in step (v) under conditions of the vacuum heating distillation method to obtain final product. USE - The method is useful for preparing graphene air filter core. ADVANTAGE - The method: solves the problem of single source of related filter products while ensuring the quality of air filtration; has simple process, and low production cost; and is environmentally friendly.