▎ 摘　　要

NOVELTY - Preparation of graphene/carbon dot/magnetic composite material involves dispersing xylitol, lysine, serine and hydrogen peroxide in deionized water, adding iron salt and nickel salt, ultrasonically processing, adding mixed acid, mixing, refluxing, dialyzing, obtaining solution (A), dispersing graphene oxide in deionized water, adding additive (B) and hydrazine hydrate, mixing, hydrothermally reacting, cooling, filtering, drying, ultrasonically dispersing obtained reagent (C) and solution (A), reacting, washing, freeze-drying, heat-preserving freeze-dried powder, and cooling. USE - Preparation of graphene/carbon dot/magnetic composite material (claimed). ADVANTAGE - The method enables preparation of graphene/carbon dot/magnetic composite material with excellent magnetic property, photocatalytic degradation property and photocatalytic stability. DETAILED DESCRIPTION - Preparation of graphene/carbon dot/magnetic composite material involves adding xylitol, lysine, serine and hydrogen peroxide to deionized water, ultrasonically processing, performing microwave heating treatment at 110-150 degrees C for 5-30 minutes, cooling to room temperature, adding iron salt and nickel salt, ultrasonically processing at 50-200 W for 20-60 minutes, adding mixed acid, uniformly mixing, refluxing at 150-180 degrees C for 1-3 hours, dialyzing reaction solution at room temperature for 72 hours or more, obtaining solution (A), ultrasonically dispersing graphene oxide in deionized water for more than 30 minutes, adding additive (B) and hydrazine hydrate, uniformly mixing, performing microwave hydrothermal reaction at 160-180 degrees C for 45-120 minutes, cooling to room temperature, filtering, drying, obtaining reactant (C), ultrasonically dispersing reagent (C) and solution (A), performing microwave hydrothermal reaction at 120-150 degrees C for 30-90 minutes, stirring at room temperature for 3-8 hours, washing reaction product 5 times with deionized water and anhydrous ethanol, freeze-drying, heat-preserving obtained freeze-dried powder at 250-300 degrees C for 30-60 minutes, and cooling to room temperature. The additive B is tetrafluoro-tetracyanoquinoline dimethane, zinc tetraphenylporphyrin, perfluorophthalocyanine and/or copper perchloride.