▎ 摘　　要

NOVELTY - Preparing coal-based graphene and coal-based graphene quantum dot comprises (i) crushing raw coal sample, treating with hydrochloric acid, nitric acid and hydrofluoric acid to obtain a deashed sample of the coal, (ii) adding obtained deashed coal sample into high-frequency graphitization furnace, and performing graphitization to obtain coal-based graphite, (iii) uniformly mixing coal-based graphite with sodium nitrate, concentrated sulfuric acid, adding potassium permanganate into the mixed solution, reacting, adding hydrogen peroxide, centrifuging, adding ultrapure water into solid graphite oxide prepare graphite oxide suspension, adding concentrated nitric acid to the coal-based graphite oxide suspension and performing ultrasonic centrifugation to obtain graphene oxide solution and (iv) adding excess hydrazine hydrate to graphene oxide solution, carrying out reduction reaction, performing suction filtration and washing, and vacuum drying to obtain final product. USE - The method is useful for preparing coal-based graphene and coal-based graphene quantum dot. ADVANTAGE - The method: improves the processing of the coal-based graphene preparation. DETAILED DESCRIPTION - Preparing coal-based graphene and coal-based graphene quantum dot comprises (i) crushing raw coal sample to below 200 mesh, treating with hydrochloric acid, nitric acid and hydrofluoric acid to remove the minerals in the coal to obtain a deashed sample of the coal, (ii) adding obtained deashed coal sample into a high-frequency graphitization furnace, and performing high-temperature graphitization to obtain coal-based graphite, (iii) uniformly mixing coal-based graphite with sodium nitrate and concentrated sulfuric acid, continuously stirring, adding potassium permanganate into the mixed solution, reacting, adding hydrogen peroxide to remove excess potassium permanganate, centrifuging to obtain a solid graphite oxide, adding ultrapure water into solid graphite oxide prepare graphite oxide suspension, adding small amount of concentrated nitric acid to the coal-based graphite oxide suspension and performing ultrasonic centrifugation to obtain graphene oxide solution and (iv) adding excess hydrazine hydrate to graphene oxide solution, carrying out reduction reaction in a water bath at 98℃, performing suction filtration and washing, and vacuum drying to obtain final product.