▎ 摘　　要

NOVELTY - An ultra-thin bismuth oxychloride/nitrogen-doped graphene quantum dot composite photocatalyst includes 9598 w.% bismuth oxychloride and remaining nitrogen-doped graphene quantum dots. USE - Ultra-thin bismuth oxychloride/nitrogen-doped graphene quantum dot composite photocatalyst for use in degradation of Rhodamine B. ADVANTAGE - The method synthesizes bismuth oxychloride/nitrogen-doped graphene quantum dot composite photocatalyst rapidly by a simple method at low cost through one-step in-line hydrothermal synthesis of precursor of nitrogen-doped graphene quantum dot and precursor of bismuth oxychloride, with improved activity and stability, and achieves degradation rate of Rhodamine B under visible light irradiation as high as 97.35%. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of ultra-thin bismuth oxychloride/nitrogen-doped graphene quantum dot, which involves (i) dissolving appropriate amounts of bismuth(III) nitrate pentahydrate and polyvinylpyrrolidone in mannitol solution, slowly adding appropriate amount of saturated aqueous potassium chloride solution to obtain a uniform white suspension, stirring for 30 minutes, (ii) dissolving appropriate amount of citric acid and urea in the mixture obtained in step (i), mixing, transferring the mixture to a stainless steel autoclave lined with Teflon (RTM: PTFE), heating at 160 degrees C for 4 hours, cooling naturally to room temperature, washing resulting solid several times with water and drying at 60 degrees C.