▎ 摘　　要

NOVELTY - Preparing graphene oxide by one-step method under low temperature condition comprises maintaining temperature at -5 degrees C to 5 degrees C, adding crystalline flake graphite and sodium nitrate to concentrated sulfuric acid to react for 30-60 minutes under the condition of stirring, slowly adding potassium permanganate and carrying out reaction for not less than 36 hours at the temperature of -5 degrees C to 15 degrees C, lower dripping dilute sulfuric acid to stop the reaction, then dripping hydrogen peroxide solution until there is no bubble generated to obtain oxidized graphene solution, orderly performing the acid washing, water washing the the graphene oxide solution to neutralize, and subjecting to ultrasonic treatment and drying to obtain oxidized graphite alkene powder. USE - The method is useful for preparing graphene oxide by one-step method under low temperature condition. ADVANTAGE - The method is simple; and economical.