▎ 摘　　要

NOVELTY - A needle coke-based monoatomic metal graphene catalyst is prepared by oxidizing and stripping macromolecular condensed aromatic hydrocarbon crystal needle coke stacked in a layered structure to prepare graphene oxide, then using an imidazole organic substance to carry out functionalization modification on the graphene oxide as a carbon skeleton precursor, introducing a metal salt, so that the imidazole group and the metal are subjected to coordination action, and carrying out high-temperature pyrolysis conversion under inert gas to obtain a nitrogen-doped graphene supported monatomic metal catalyst. USE - The needle coke-based monoatomic metal graphene catalyst is useful for water treatment environment, and in rapid catalytic degradation of macromolecular organic pollutants in water in process of advanced catalytic oxidation treatment. ADVANTAGE - The needle coke-based monoatomic metal graphene catalyst has excellent decomposition effect on the excess oxidizing agent hydrogen peroxide to avoid the occurrence of secondary pollution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method preparing the needle coke-based monoatomic metal graphene catalyst, which involves: (1) preparing graphene oxide by adding needle coke powder and sodium nitrate to concentrated sulfuric acid, stirring in an ice bath, then adding potassium permanganate, heating and stirring, finally adding deionized water and hydrogen peroxide to stop the reaction, successively washing with hydrochloric acid and deionized water, filtering, drying, dispersing in deionized water, ultrasonically stripping, centrifuging and freeze-drying; (2) preparing imidazole organic functionalized modified graphene oxide by taking the imidazole organic substance dissolved in methyl ethyl ketone solvent, then adding to isophorone diisocyanate, stirring, then adding graphene oxide, reacting at 70-80 degrees C, filtering, and drying; and (3) preparing metal monoatomic nitrogen-doped graphene by adding the metal salt to a solvent to make a solution (A), then adding the imidazole organic functionalized graphene oxide obtained in step (2) to the solvent to prepare a solution (B), uniformly mixing the solutions (A) and (B), ultrasonically dissolving, drying, placing in a tubular heating furnace, sintering at a high temperature of 800-900 degrees C under an inert gas atmosphere for 3-4 hours, where the heating rate is 5 degrees C/minute, naturally cooling to room temperature, removing the sample and grinding.