▎ 摘　　要

NOVELTY - Preparation of non-homogeneous iron-based bimetallic mono-atom catalyst involves (S1) ultrasonically stripping the prepared graphene oxide (GO) in high-power ultrasonic instrument for one or more processing modes of plasma treatment or hydrogen peroxide deep oxidation to obtain large-defect graphite oxide dispersion (A), (S2) adding one or more soluble iron metal salt, metal (M) salt and nitrogen source dicyandiamide (DCDA) or melamine or urea into dispersion (A) in order, (S3) stirring at room temperature for 24 hours, freeze-drying to prepare iron/metal-GO precursor, (S4) placing the precursor into quartz boat, raising the temperature to 500℃ at the heating rate of 5-10℃/minute, heat-preserving for 3 hours under high-purity argon atmosphere, raising the temperature, cooling to obtain black powder, (S5) adding into sulfuric acid or hydrochloric acid solution, stirring, washing the black solid to neutral, drying in a vacuum oven. USE - Preparation of non-homogeneous iron-based bimetallic mono-atom catalyst used for activating persulfate to treat phenol-containing wastewater. ADVANTAGE - The catalyst has excellent catalytic activity and reusability when used to activate persulfate to treat phenol-containing wastewater. DETAILED DESCRIPTION - Preparation of non-homogeneous iron-based bimetallic mono-atom catalyst involves (S1) ultrasonically stripping the prepared graphene oxide (GO) in high-power ultrasonic instrument for one or more processing modes of plasma treatment or hydrogen peroxide deep oxidation to obtain large-defect graphite oxide dispersion (A), (S2) adding one or more soluble iron metal salt, metal (M) salt and nitrogen source dicyandiamide (DCDA) or melamine or urea into dispersion (A) in order, (S3) stirring at room temperature for 24 hours, freeze-drying to prepare iron/metal-GO precursor, (S4) placing the precursor into quartz boat, raising the temperature to 500℃ at the heating rate of 5-10℃/minute, heat-preserving for 3 hours under high-purity argon atmosphere, raising the temperature to 800℃, heat-preserving for 4 hours, naturally cooling to room temperature to obtain black powder, (S5) adding into 0.5 M sulfuric acid or 1.0 M hydrochloric acid solution, stirring at 60-90℃ for 12 hours, filtering, washing the black solid to neutral, drying in a vacuum oven. The catalyst comprises nitrogen-doped graphene, supported mono-atom iron and mono-atom (M). The loading amount of metal iron in the catalyst is 1.00-2.00%, and metal (M) is 1.00-2.00%. In step (S2), the ratio of iron and metal (M) element is 0.5-2.0%. The mass ratio of nitrogen source to GO is 15:1-45:1