▎ 摘　　要

NOVELTY - Preparing reduced graphene oxide by one-step method comprises e.g. (i) placing crystalline flake graphite in concentrated sulfuric acid, adding sodium nitrate, adding potassium permanganate solid under stirring in ice-water bath, (ii) placing mixture system on water bath, carrying out reaction under stirring condition, adding deionized water to mixed solution, stirring, heating mixture on oil bath, adding hydrogen peroxide solution, (iii) adding step (ii) obtained mixed solution to metal reducing agent under stirring state until system color changes from bright yellow to black, and filtering. USE - The method is useful for preparing reduced graphene oxide (claimed). ADVANTAGE - The method has simple preparation method, and is suitable for industrial production, and produces reduced graphene oxide having good dispersibility in different solvents. DETAILED DESCRIPTION - Preparing reduced graphene oxide by one-step method comprises (i) placing 0.1-5 g crystalline flake graphite in concentrated sulfuric acid, adding 0-3 g sodium nitrate, adding 1-20 g potassium permanganate solid under stirring in ice-water bath to maintain system temperature stability less than 10 degrees C, (ii) placing mixture system at 30-50 degrees C on water bath, carrying out reaction under stirring condition for 20 minutes, adding 50-400 ml deionized water to mixed solution, stirring for 20 minutes, heating mixture on oil bath at 60-100 degrees C, then adding 2-20 ml of 30% hydrogen peroxide solution, where system color changes from brown to bright yellow, and (iii) adding step (ii) obtained mixed solution to 0.1-5 g metal reducing agent under stirring state until system color changes from bright yellow to black, allowing mixed solution to stand for 12-24 hours, filtering, washing using 5% hydrochloric acid and deionized water until filtrate becomes neutral, ultrasonicating the filtrate for 0.5-4 hours, carrying out low-speed centrifugation for 30-180 minutes, taking supernatant, drying clear solution in vacuum oven at 60 degrees C for 24 hours, dispersing dried samples in different solvents to obtain final product, where metal element is used as reducing agent.