▎ 摘　　要

NOVELTY - Ferrous sulfide-graphene quantum dot composite nanomaterial comprises graphene quantum dot and ferrous sulfide as a raw material, and has a spherical shape and a particle diameter of 10-12 nm. USE - The composite nanomaterial is useful for catalytically degrading methyl orange by a Fenton reaction (Claimed). ADVANTAGE - The nanomaterial: is tested by catalytic degradation of methyl orange, has comprehensively evaluated catalytic activity in organic matter degradation that provides a reliable experimental basis for the treatment of industrial wastewater containing organic pollutants, and provides a new idea for the production of graphene-based Fenton catalysts and application in the environmental field. The method: is simple, has high catalytic efficiency and is environmentally friendly. DETAILED DESCRIPTION - An INDEPENDENT CLAIMS are also included for: (1) preparing ferrous sulfide- graphene quantum dot (FeS-GQDs) composite nanomaterial comprising dissolving graphene quantum dot in distilled water, adding an aqueous solution of ferrous sulfate heptahydrate and sodium sulfide nonahydrate, mixing, reacting under nitrogen for 10 hours, subjecting to dialysis, and vacuum drying to obtain the product; and (2) the ferrous sulfide-graphene quantum dot composite nanomaterial prepared by the above mentioned method.