Method for preparing nano-graphene oxide by electrochemically exfoliating carbon fiber material

A method for preparing nano-graphene oxide by electrochemically exfoliating a carbon fiber material, comprising the following steps:

• (1) building an electrochemical reaction system, consisting of:
• a raw material with a carbon fiber as a basic structural unit as an anode, a metal or graphitic carbon material as a cathode, and a phosphate buffer solution with a neutral pH as an electrolyte solution in which a concentration of PO43− is 50-500 mmol/L;
• (2) electrochemically exfoliating the carbon fiber;
• during an electrolysis process, controlling a voltage between the anode and the cathode to be 3-10 V, and performing electrolysis for 8-24 h;
• and gradually exfoliating the carbon fiber in the anode raw material and dispersing the carbon fiber in the electrolyte solution to generate graphene oxide;
• and
• (3) performing purification to obtain the nano-graphene oxide;
• centrifuging to separate the reacted electrolyte solution, taking upper dispersion liquid, and washing away residual anions and cations;
• and performing ultrasonic treatment to obtain the nano-graphene oxide dispersed in water and free of impurities.