▎ 摘　　要

NOVELTY - Composite catalyst graphene quantum dots/bismuth tungstate, where the bismuth tungstate is loaded with graphene quantum dots graphene quantum dots. USE - The composite catalyst graphene quantum dots/bismuth tungstate is useful for degrading nitric oxide. ADVANTAGE - The composite catalyst: improves nitric oxide degradation ability and enhanced degradation stability; and solves the problem of low nitric oxide degradation efficiency of bismuth tungstate under visible light. DETAILED DESCRIPTION - AN INDEPENDENT CLAIM are also included for preparing composite catalyst graphene quantum dots modified/bismuth tungstate comprising (i) providing citric acid monohydrate (CA), heating it in an oil bath at 180-210 degrees C, cooling it, adding 0.25 mol/l sodium hydroxide to adjust the pH of the solution to 7, and storing the obtained liquid at 4 degrees C, (ii) mixing 3 mmol bismuth(III) nitrate pentahydrate with 20 ml nitric acid, stirring at room temperature, according to 1.5 mmol sodium tungstate dihydrateare:10 ml deionized water dissolved in deionized water to obtain sodium tungstate aqueous solution, adding the sodium tungstate aqueous solution dropwise to the clear solution of bismuth nitrate, stirring the turbid mixed suspension at room temperature, adding 2-12 ml of graphene quantum dots, and stirring at room temperature, adjusting the pH of the solution to 2 with sodium hydroxide (1M), pouring the mixture into a polytetrafluoroethylene reactor, and reacting at 160-200 degrees C for 16-30 hours, cooling to room temperature, centrifuging the contents of the reactor to remove the supernatant, and washing with deionized water and absolute ethanol and obtaining the solid by drying is the composite catalyst graphene quantum dots/bismuth tungstate.