▎ 摘　　要

NOVELTY - Graphene-supported metal single-atom composite material comprises a graphene material, a metal single atom is uniformly dispersed in the graphene material, and has catalytic degradation performance, where the metal single-atom material contains a metal active center and the graphene material coordinates to realize the anchoring of the metal monoatomic material on the graphene material. USE - Graphene-supported metal single-atom composite material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method for preparing the composite material, which involves adding biomass material in the metal soluble salt solution to mix to obtain the reaction mixture, under the first reaction temperature condition, the reaction mixture is subjected to hydrothermal carbonization reaction, so that the active metal is coordinated with oxygen-containing functional group to form hydrothermal carbon precursor of metal uniform load, under the condition of the second reaction temperature and inert gas atmosphere, the hydrothermal carbon precursor under the high temperature carbon thermal shock reaction is converted graphene material, providing activation energy for metal single atom dispersion, the metal active centre and the carbon substrate interaction to form a stable coordination structure, to realize anchoring of the metal single atom on the graphene material, cooling to obtain the metal single atom graphene; and (2) a method for catalytic degradation of phenolic pollutants, which involves dispersing the graphene-supported metal single-atom composite material in an aqueous solution containing phenolic pollutants, adding persulfuric acid salt mixing breaks down the phenolic pollutant decomposition.