▎ 摘　　要

NOVELTY - Nitrogen-doped graphene aerogel is synthesized by mixing graphene oxide in deionized water, subjecting to ultrasonic dispersion for 10-30 minutes, adding urea, mechanical stirring for 15 minutes, subjecting to hydrothermal reaction in a muffle furnace controlled at 180 degrees C for 12 hours, immersing in distilled water for 2-3 days, freeze-drying, adding polyvinyl alcohol solution, stirring, and coating obtained paste on a paper electrode. USE - Method of synthesizing nitrogen-doped graphene aerogel for electric absorption of heavy metal zinc ion in wastewater. ADVANTAGE - The method is simple, fast and environment friendly, and obtains aerogel having high adsorption efficiency. DETAILED DESCRIPTION - Nitrogen-doped graphene aerogel is synthesized by mixing graphene oxide in deionized water, subjecting to ultrasonic dispersion for 10-30 minutes, adding urea, mechanical stirring for 15 minutes, subjecting to hydrothermal reaction in a muffle furnace controlled at 180 degrees C for 10-12 hours, immersing in distilled water for 2-3 days, freeze-drying, adding polyvinyl alcohol solution, stirring, coating obtained paste on a paper electrode, placing the nitrogen-doped graphene aerogel paper electrode in a heavy metal ion solution, performing metal absorption using paper electrode as working electrode, platinum electrode as counter electrode and calomel electrode as reference electrode, performing conductivity meter real-time monitoring where nitrogen-doped graphene aerogel paper electrode absorption reaches balance when the conductivity is unchanged, and desorbing and regenerating the used electrode.