▎ 摘　　要

NOVELTY - Preparing gold nanoparticles doped phosphorus and sulfur co-doped graphene quantum nanocomposite comprises adding 10 ml phosphorus, sulfur graphene quantum dots (P,S-GQDs) solution (5 mg/ml) to the flask, heating the water bath at 60 degrees C, then slowly adding 5 ml chloroauric acid solution (0.1 mmol) in a drop wise manner under vigorous stirring to obtain a mixture, reacting the obtained mixture for 10-50 minutes, centrifuging the mixture, then washing the resulting precipitate with water, and resuspending in 2 ml water to obtain gold nanoparticles doped phosphorus and sulfur co-doped graphene quantum nanocomposite with core-shell structure. USE - The nanocomposite is useful in trace detection of mercury ions, and removing adsorption of precipitate (claimed). ADVANTAGE - The nanocomposite: has core-shell structure, and has high sensitivity and selectivity for the detection of heavy metal mercury (II) ions, and adsorption and removal rate of mercury (II) ions, i.e. 95%. The method: can easily reycle gold nanoparticles doped phosphorus and sulfur graphene quantum dots nanocomposite after desorption and regeneration treatment. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) gold nanoparticle doped phosphorus and sulfur co-doped graphene quantum nanocomposite prepared by the above method; and (2) use of nanocomposite in trace detection of mercury ions, and removing adsorption of precipitate.