▎ 摘　　要

NOVELTY - Preparing a graphene-ionic liquid composite sulfur adsorbent, comprises (1) adding cationic salt and bromoalkane, stirring and reacting for 16-24 hours at 50-70℃, performing suction filtration and washing with ethanol to obtain cationic bromide, (2) carrying out ultrasonic dispersing of graphene oxide in an acetone solvent, and then adding cationic bromine salt and NaBF4, introducing nitrogen for protection, stirring and reacting for 16-24 hours at 50-70℃, performing suction filtration, washing with dichloromethane and drying to obtain a product, and (3) dispersing the product in water, adding neutral salt, stirring uniformly, adding a hydrazine hydrate solution and an ammonia aqueous solution, reacting for 6-12 hours at the temperature of 80-120℃, centrifuging, washing with water and freeze-drying to obtain the final product. USE - The graphene-ionic liquid composite sulfur adsorbent is useful in methane desulfurization (claimed). ADVANTAGE - The adsorbent: can adsorb the thiophene aromatic hydrocarbon sulfide in methane; and solve the problem of purification of methane propellant.