▎ 摘　　要

NOVELTY - Preparation of single atom-supported carbon-based catalyst comprises mixing graphene oxide and deionized water to obtain graphene oxide suspension, adding manganese salt aqueous solution, sonicating, freeze-drying to obtain black powder, heating to 750-760 degrees C for 1-1.5 hours under ammonia conditions, and cooling to room temperature of 20-25 degrees C. The ratio of manganese and graphene oxide is 1:15-120. USE - The method is for preparation of single atom-supported carbon-based catalyst used for removing antibiotics in liquid, such as sulfa and/or enrofloxacin (all claimed). ADVANTAGE - The catalyst can increase the removal efficiency of sulfa by 20-30%, reaches maximum removal efficiency of sulfonamide of up to 98.33%, and can also remove enrofloxacin.