▎ 摘　　要

NOVELTY - A magnetic photocatalyst comprises a sulfur-doped graphite-type carbon nitride nanosheet as a carrier modified with graphene and ferroferric oxide particles. USE - Magnetic photocatalyst is used for treating wastewater comprising antibiotics such as ranitidine and oxytetracycline (all claimed). ADVANTAGE - The magnetic photocatalyst has high photocatalytic activity with easy recovery of magnetic force, high safety, and excellent stability, and is obtained economically by simple process, and can treat wastewater containing multiple antibiotics with improved recyclability and efficiency by simple operation. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of magnetic photocatalyst, which involves heating thiourea as a precursor in high-temperature environment in a special device, screening, grinding and sieving to obtain a sulfur-doped carbon nitride nanosheet, mixing a graphene oxide solution with the nanosheet, ultrasonically-dispersing to obtain a graphene-loaded sulfur-doped carbon nitride nanosheet, dispersing and mixing a ferrous chloride and ferric chloride solution with the graphene-loaded sulfur-doped carbon nitride nanosheet, heating in a water bath, and adding aqueous ammonia to carry out alkali thermal co-precipitation; and (2) usage method of magnetic photocatalyst in treatment of antibiotic wastewater, which involves mixing the magnetic photocatalyst and antibiotic wastewater for performing photocatalytic reaction.