▎ 摘　　要

NOVELTY - Three-dimensional graphene/iron oxide magnetic nano-adsorbent material is prepared by ultrasonic treating 30-50 mg graphene oxide in deionized water for 20 minutes to obtain graphene oxide dispersion liquid, adding 100-120 mg iron trichloride hexahydrate, ultrasonic dissolving, adding 180-220 mg L-cysteine, adding 1 mL ammonia water to adjust pH, and stirring for 95 hours at 3-4 degrees C to magnetic black precipitate reactant; and cooling to room temperature, separating hysteresis and black precipitate, repeatedly washing with deionized water and absolute ethanol, and freeze-drying for 20-30 hours. USE - Three-dimensional graphene/iron oxide magnetic nanoadsorbing material is used for adsorbing cationic, anionic or neutral dye contaminants in water (claimed). ADVANTAGE - The material has low cost, large specific surface area, rich hydroxyl groups and free carboxyl groups, and good magnetic properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the use of the nano-adsorbent material for adsorbing cationic, anionic or neutral dye contaminants in water.