▎ 摘　　要

NOVELTY - Preparing graphene composite material, comprises (i) adding graphene oxide into thiourea solution having concentration of 10-15 mmol/l to obtain mixed solution, where addition amount of graphene oxide is 0.5-1.5 g/per 100 ml thiourea solution, (ii) ultrasonicating obtained mixed solution under ultrasonic cell grinder probe for 30 minutes to 1 hour, (iii) magnetically stirring the obtained solution at 80-100 degrees C for 4-6 hours, (iv) freeze-drying the obtained solution, (v) washing the obtained material with ultrapure water repeatedly until the excess thiourea impurities on the surface are removed, and (vi) placing the material in ultrapure aqueous solution having volume of 1-1.5 times the volume of thiourea solution of step (i), and freeze-drying to obtain nitrogen- and sulfur-doped graphene composite material. USE - The composite material is useful in sulfonamide antibiotic wastewater purification (claimed). ADVANTAGE - The method: has simple operation, short synthetic steps and low production cost; and is environmentally friendly. The composite material has high adsorbability to sulfonamide antibiotic.