▎ 摘　　要

NOVELTY - Nickel-iron bimetallic single-atom catalyst comprises a nitrogen-doped graphene supported single-atom nickel and iron. The content of nickel/iron dispersed by single atom in the catalyst is 1.00-3.00 wt.%. USE - Nickel-iron bimetallic single-atom catalyst used for directly activating persulfate to process nitrogen-doped graphene containing phenolic waste water. ADVANTAGE - The nickel-iron bimetallic single-atom catalyst has excellent catalytic activity and repeated use. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for s method for preparing a nickel-iron bimetallic single-atom catalyst, which involves: a. ultrasonically peeling graphite oxide in high-power ultrasonic instrument to obtain graphene oxide, and then dispersing to obtain graphene oxide dispersion; b. adding soluble nickel, iron metal salt and dicyandiamide in sequence; c. stirring at room temperature for 12 hours, and then freeze-drying to obtain the nickel/iron-GO precursor; d. placing the precursor into a quartz boat, and in a high-purity nitrogen atmosphere, heating up to 650℃ at a heating rate of 2-5℃/minutes for 2 hours, and then heating up to 850℃ for 2 hours, naturally cooling to room temperature to obtain black powder; and f. adding the black powder into a 0.5M sulfuric acid solution, stirring at a constant temperature of 80℃ for 10 hours, filtering and washing the black solid to neutrality, and drying the solid in a vacuum drying oven to obtain product.