▎ 摘　　要

NOVELTY - Preparing nitrogen-doped-graphene quantam dots-polystyrene-cadmium sulfide (N-GQDs-PS-CdS) core-shell nanocatalyst comprises preparing a mixed solution of nitrogen-doped-graphene quantam dots (N-GQDs) and polystyrene-cadmium sulfide (PS-CdS), and successively allowing to stand, and reacting and heating. USE - The nanocatalyst is used as a photocatalyst for photodegradation reaction of methylene blue and methyl orange (claimed). ADVANTAGE - The nano-catalyst has good stability, combines photo-generated electrons with holes, and the problems of their own light defects significantly improves the photocatalytic efficiency, achieves 100% degradation of methylene blue and methyl orange within 90 minutes under ultraviolet light irradiation. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for nitrogen-doped-graphene quantam dots-polystyrene-cadmium sulfide core-shell nanocatalyst obtained by the method as mentioned above.