▎ 摘　　要

NOVELTY - Removal of iron ion in water using nitrogen (N)-modified graphene electrode includes ultrasonically dispersing oxidized graphene in deionized water, ultrasonically treating to uniformly disperse, adding urea, mechanically stirring, adding the mixed solution into a hydrothermal reaction kettle, placing in muffle furnace, heating, reacting, immersing the product in distilled water, freeze drying to obtain N-doped graphene aerogel, dispersing with polyvinyl alcohol solution to form a paste, coating on hard paper, and obtaining N-doped graphene aerogel paper electrode. USE - Removal of iron ion i.e. Fe3+ heavy metal ion in water using N-modified graphene electrode (claimed). ADVANTAGE - The preparation of N-doped graphene aerogel is simple and environment-friendly and has no pollution. The N-modified graphene electrode has high adsorption efficiency for iron ions in water, fast speed, simple operation, and greatly improved recycling property compared with the prior art material. DETAILED DESCRIPTION - Removal of iron ion in water using N-modified graphene electrode comprises preparing N-doped graphene aerogel by ultrasonically dispersing oxidized graphene in deionized water, ultrasonically treating for 10-30 minutes to uniformly disperse, adding urea, mechanically stirring for 15 minutes, adding the mixed solution into a hydrothermal reaction kettle, placing in muffle furnace, heating at 180 degrees C, reacting for 12 hours, after the reaction, immersing the product in distilled water for 2-3 days and freeze drying to obtain N-doped graphene aerogel, preparing N-doped graphene aerogel paper electrode by dispersing the N-doped graphene aerogel with polyvinyl alcohol solution to form a paste, coating 0.1-0.4 ml paste on hard paper, and obtaining N-doped graphene aerogel paper electrode, and conducting electrochemical method to remove iron ion in water by preparing iron ion solution, measuring iron ion in the solution, putting in electroadsorption container, putting the N-doped graphene aerogel paper electrode, iron ion adsorption using a three-electrode system, where N-doped graphene aerogel paper electrode is used as working electrode, platinum electrode as counter electrode, and calomel electrode as reference electrode, real-time monitoring the solution conductivity using conductivity meter, where when conductivity is unchanged, the nitrogen-doped graphene aerogel paper electrode adsorption reaches the equilibrium state, and desorbing and regenerating the saturated N-doped graphene aerogel paper electrode.