▎ 摘　　要

NOVELTY - Preparation of nitrogen-doped graphene magnetic nanoparticle material involves mixing graphite-phase carbon nitride and ferrocene, placing in sealed container for heat treating, and naturally cooling to room temperature. USE - Preparation of nitrogen-doped graphene loaded magnetic nanoparticle material used as photocatalyst for treating tetracycline-containing wastewater (all claimed). ADVANTAGE - The method provides nanoparticle material having excellent magnetic adsorption property, tetracycline degradability, and magnetic field recoverability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: the nitrogen-doped graphene loaded magnetic nanoparticle material, which has carbon content of 70-90%, oxygen content of 5-10%, nitrogen content of 4-10%, and iron content of 1-10%. The magnetic nanoparticles comprise iron simple substance or iron compound coated with carbon; and treatment of tetracycline-containing wastewater using the nitrogen-doped graphene loaded magnetic nanoparticle material, which involves adding 2 mg nanoparticle material to 20 mL tetracycline aqueous solution with initial concentration of 10 mg.L and pH of 7, at 25-50°C, stirring for 60 minutes under dark conditions, irradiating with sunlight and continuously stirring for 120 minutes, and removing the nanoparticle material using external magnetic field for recycling. The degradation rate of tetracycline reaches 97.1%.-1