▎ 摘　　要

NOVELTY - Biomass graphene is prepared by (a) formulating nickel chloride to an aqueous solution, adding the nickel chloride aqueous solution to cellulose, and heating to semi-dry state of cellulose, (b) paving the obtained cellulose to a corundum ark, and performing thermal cracking reaction to obtain solid powder, and (c) adding the obtained solid powder to hydrochloric acid, performing heat reflux treatment for three times, washing with deionized water until the solid powder is neutral, and vacuum drying to obtain the biomass graphene. USE - The biomass graphene is used for treating wastewater containing methylene blue or rhodamine B (claimed). ADVANTAGE - The biomass graphene has excellent wastewater treating effect and high value for waste biomass, turns waste into treasure, and is environmentally-friendly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for using biomass graphene, comprising adding the biomass graphene to wastewater containing methylene blue or rhodamine B in a solid-to-liquid ratio of 1 g:(1-5) l, performing oscillation adsorption at 30 degrees C under the rate of 180 rpm for 4-24 hours.