▎ 摘　　要

NOVELTY - Preparing nitrogen-doped porous graphene, involves preparing a graphene oxide suspension by improving a Hummer's method, and freeze-drying to obtain graphene oxide aerogel; uniformly dispersing the graphene oxide aerogel, a nitrogen-containing precursor and an activating agent into deionized water, and then drying and calcining at high temperature to obtain nitrogen-doped porous graphene; where the content of the first and second substances, the nitrogen-containing precursor is selected from urea, melamine and ammonium hydroxide; the activating agent is selected from potassium ferrate(VI) (KFeO4) and Potassium hydroxide (KOH). USE - Method for preparing nitrogen-doped porous graphene, used for efficient catalytic reduction of an aromatic nitro compound such as 4-nitrophenol, p-nitroaniline and p-nitrotoluene (all claimed). ADVANTAGE - The nitrogen-doped porous graphene is prepared simply and efficiently, has large specific surface area, and high nitrogen content, has better catalytic activity than catalysts reported in the literature when applied to catalytic reduction of aromatic nitro compounds, reduce the aromatic nitro compounds in aqueous solution under mild conditions, and has low cost and environmental friendliness. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a nitrogen-doped porous graphene, which is obtained by the method for preparing the nitrogen-doped porous graphene.