▎ 摘　　要

NOVELTY - Preparation of plant-based graphene involves drying agricultural and forestry biomass raw material, performing liquefaction using phenol and filtering to obtain bio-oil, mixing bio-oil and iron-series element as catalyst, adding obtained mixture into self-pressurizing reactor, sealing, then providing into high-temperature furnace, calcining, cooling, performing acid pickling to recover catalyst, washing obtained sample using deionized water and drying. The obtained plant-based graphene has conductivity of 370 s/cm, specific surface area of 760 m2/g and thickness of 1-3 nm. USE - Preparation of plant-based graphene (claimed). ADVANTAGE - The method enables economical preparation of plant-based graphene with high productivity. DETAILED DESCRIPTION - Preparation of plant-based graphene involves drying agricultural and forestry biomass raw material, performing liquefaction using phenol and filtering to remove inorganic impurities to obtain bio-oil, mixing bio-oil and iron-series element as catalyst in a mass ratio of (0.1-1):1, adding predetermined amount of obtained mixture into self-pressurizing reactor, sealing the reactor, then providing into high-temperature furnace, calcining, naturally cooling, performing acid pickling to recover catalyst, washing obtained sample using deionized water and drying. The volume of material does not exceed 1/3 of reactor volume. The obtained plant-based graphene has electroconductivity of 370 s/cm, specific surface area of 760 m2/g and thickness of 1-3 nm.