▎ 摘　　要

NOVELTY - Preparing iron nitride doped nitrogen doped graphene composite material comprises using graphite powder and ferric nitrate as raw materials for ball milling to obtain surface-modified iron oxide graphene, i.e. iron oxide doped graphene composite material, and annealing the iron oxide doped graphene composite material with ammonia gas. USE - The iron nitride doped nitrogen-doped graphene composite material is useful in adsorbing dyes or preparing dye adsorbents, and catalyzing oxygen evolution reaction or preparing oxygen evolution reaction electrocatalyst, (dye is methylene blue, Congo red and reactive violet K-3R) (claimed). ADVANTAGE - The composite material: has good dye adsorption performance, high electrocatalytic activity for oxygen evolution reaction, and has good practical application value. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) iron nitride doped nitrogen-doped graphene composite material prepared by the above method; (2) use of iron nitride doped nitrogen-doped graphene composite material in adsorbing dyes or preparing dye adsorbents, catalyzing oxygen evolution reaction or preparing oxygen evolution reaction electrocatalyst, where the dye is methylene blue, Congo red and reactive violet K-3R; (3) dye adsorbent comprising iron nitride doped nitrogen-doped graphene composite material; (4) oxygen evolution reaction electrocatalyst comprising iron nitride doped nitrogen-doped graphene composite material; (5) processing dye-containing wastewater comprising applying the iron nitride doped nitrogen-doped graphene composite material, or dye adsorbent to wastewater, where the processing method further comprises separating the iron nitride doped nitrogen-doped graphene composite material or dye adsorbent after adsorbing the dye from the water based on the magnetic effect; and (6) electrocatalytic water decomposition for generating oxygen comprising applying the iron nitride doped nitrogen-doped graphene composite material, or oxygen evolution reaction electrocatalyst to water.