▎ 摘　　要

NOVELTY - The preparation method of functional magnetic ionic liquid-graphene adsorbent involves (S1) dissolving soluble trivalent iron salt and ionic liquid according to proportion, and fully reacting to obtain brownish yellow magnetic ionic liquid, extracting the obtained magnetic ionic liquid by water, removing the unreacted reactant, and vacuum drying to obtain pure magnetic ionic liquid, (S2) adding graphene, water-soluble ionic liquid and the pure magnetic ionic liquid according to proportion to ultra-pure water, adding water-soluble bivalent iron salt at normal temperature and normal pressure under oxygen-free environment after completely reacting, dripping aqueous ammonia, continuously reacting under the action of ultrasonic wave to obtain sediment, separating and purifying using a magnet, washing and drying to obtain magnetic graphene. USE - Preparation method of functional magnetic ionic liquid-graphene adsorbent used for adsorption of biotoxin, pesticide, veterinary drug and UV absorbent in complex matrix sample (all claimed). ADVANTAGE - The method enables preparation of functional magnetic ionic liquid-graphene adsorbent by simple, fast and efficient process.