▎ 摘　　要

NOVELTY - Preparation of bismuth oxyfluoride/graphene composite visible light catalyst comprises dissolving bismuth nitrate pentahydrate in ethylene glycol; dissolving sodium fluoride in ethylene glycol; mixing prepared solutions, gradually adding deionized water, filtering, washing with deionized water and ethanol, filtering, drying, and insulating; adding graphene oxide to deionized water, ultrasonic dispersing, adding third step product, and stirring; adding hydrazine hydrate and heating; and cooling to room temperature, filtering, washing with deionized water and ethanol, and drying. USE - Method for preparing bismuth oxyfluoride/graphene composite visible light catalyst (claimed) used for degrading difficult to degrade organic pollutant. ADVANTAGE - The catalyst has wide absorption spectrum range, steady property, no toxicity, and high efficiency and is cheap. DETAILED DESCRIPTION - Preparation of bismuth oxyfluoride/graphene composite visible light catalyst comprises: (A) dissolving 2.5 mmol bismuth nitrate pentahydrate in 20 mL ethylene glycol to obtain first solution; (B) dissolving 2.5 mmol sodium fluoride in 20 mL ethylene glycol to obtain second solution; (C) mixing first and second solution, gradually adding 10 mL deionized water to obtain white precipitate, filtering, washing with deionized water and ethanol for 3 times, filtering, drying for 5 hours at 80 degrees C, and insulating at 300 degrees C for 2 hours; (D) adding 1.52-18.30 mg graphene oxide to 50 mL deionized water, ultrasonic dispersing for 60 minutes, adding 2.5 mmol product in third step, and stirring at normal temperature for 2 hours; (E) adding hydrazine hydrate, and water bath heating at 80 degrees C to restore precipitation polymerization; and (F) cooling to room temperature, filtering, washing with deionized water and ethanol for 3 times, and drying at 80 degrees C for 5 hours.