▎ 摘　　要

NOVELTY - Preparation of iodine-nitrogen double-doped graphene based on one-step hydrothermal method involves stirring and ultrasonically treating graphene oxide dispersion liquid, nitrogen source and iodine source, putting into hydrothermal reaction kettle for hydrothermal reaction, filtering and washing hydrothermal product until filtrate is neutral, and putting into freeze-dryer for freeze-drying. USE - The method is used for preparing iodine-nitrogen double-doped graphene based on one-step hydrothermal method in fields of heavy metal wastewater treatment, printing and dyeing wastewater adsorption, functional composite materials, lithium-sulfur batteries, lithium-ion batteries, gas sensors and supercapacitors (all claimed). ADVANTAGE - The method is easy to realize large-scale industrial production, and has simple operation, low cost, low energy consumption, high repetition rate and easy process control.