▎ 摘　　要

NOVELTY - The preparation method of graphene from agricultural and forestry waste biomass involves (i) adding agricultural and forestry waste biomass to water-containing reactor, hydrothermally reacting, cooling, filtering, washing the solid, and drying to obtain solid biological carbon, (ii) mixing base with solid biological carbon, grinding, mixing, heating and calcining in the presence of a shielding gas, stripping biological carbon from base, graphitizing, (iii) calcining the graphitized sample and immersing in an acid solution, filtering, washing, and drying to obtain few-layer graphene. USE - Preparation of graphene from agricultural and forestry waste biomass (claimed). ADVANTAGE - The environmentally-friendly method enables the preparation of graphene from agricultural and forestry waste biomass by simple process at low cost with high yield, under mild reaction conditions. DETAILED DESCRIPTION - The preparation method of graphene from agricultural and forestry waste biomass involves (i) taking agricultural and forestry waste biomass, adding to water-containing reactor, hydrothermally reacting, cooling the mixture to room temperature, filtering, washing the solid, and drying to obtain solid biological carbon, (ii) mixing base with solid biological carbon, grinding, uniformly mixing, heating and calcining in the presence of a shielding gas, stripping biological carbon from base, graphitizing, (iii) calcining the graphitized sample and immersing in an acid solution, filtering, washing the solid with water until the wash solution is neutral, and drying to obtain few-layer graphene.