▎ 摘　　要

NOVELTY - Preparation of graphene gas diffusion electrode involves adding flake graphite and phosphoric acid to reaction bottle placed in an ice-water bath and stirring, adding concentrated sulfuric acid to mixture, stirring mixture, adding potassium permanganate to mixture in three portions and continuing to stir, heating water bath to 35 degrees C and stirring mixture, heat-preserving and continuing to react, diluting to 350 ml with hot distilled water, centrifuging upper layer liquid and removing precipitate, washing liquid with 5% hydrochloric acid and distilled water, drying under vacuum to obtain graphene oxide, adding graphene oxide in aqueous solution, ultrasonically processing to obtain stable dispersion, adding graphite powder to ethanol and ultrasonically processing, ultrasonically processing obtained graphene dispersion and PTFE emulsion to obtain paste, uniformly adhering the paste to both sides of metal platinum mesh, cold-pressing and calcining. USE - Preparation of graphene gas diffusion electrode in electro Fenton system for degradation of organic matter in wastewater (all claimed). ADVANTAGE - The method provides graphene gas diffusion electrode which effectively improves the degradation rate of organic matter in wastewater. The method effectively ensures the increase of hydrogen peroxide production of cathode in the electric Fenton system. As graphene is produced in short period of time, toxic gases are not generated, so that the method is safe. The electrode is prepared using reduced amount of energy and effectively treats organic matter in wastewater. DETAILED DESCRIPTION - Preparation of graphene gas diffusion electrode involves adding 3-4.5 g flake graphite and 7.6 g phosphoric acid to 500 ml reaction bottle, placing reaction bottle in an ice-water bath and stirring, adding 75-100 ml concentrated sulfuric acid to the mixture, maintaining the temperature at 4 degrees C or less and stirring mixture at 700 rpm for 5 minutes, adding 8-12 g potassium permanganate to mixture in three portions and continuing to stir for 10 minutes, heating water bath to 35 degrees C and stirring mixture for 1.5 hours, adding 170 ml hot distilled water after the solution becomes viscous, heat-preserving and continuing to react for 30 minutes, diluting to 350 ml with hot distilled water and adding 30% hydrogen peroxide to remove unreacted graphite, centrifuging the upper layer liquid at high speed for 5 minutes and removing the precipitate, washing with 5% hydrochloric acid and distilled water to neutrality, drying under vacuum at 60 degrees C for 1 hour to obtain graphene oxide, adding 0.5 g graphene oxide in 100 ml aqueous solution, adjusting the pH to 10 using 28% aqueous ammonia and ultrasonically processing for 30 minutes to obtain stable dispersion without obvious particles, adding 0.8 g graphite powder to 15 ml of 95% ethanol and ultrasonically processing for 20 minutes, adding 20-40 ml graphene dispersion and 0.2 g of 60% PTFE emulsion, and ultrasonically processing for 20 minutes to obtain paste, uniformly adhering the paste to both sides of metal platinum mesh, cold-pressing for 10 minutes under pressure of 1.5 MPa and calcining at 320 degrees C for 1 hour. An INDEPENDENT CLAIM is included for usage method of the graphene diffusion electrode in electro Fenton system for degradation of organic matter in wastewater, which involves using graphene gas diffusion electrode as working electrode, saturated calomel electrode as reference electrode, and platinum as an anode, connecting three electrodes to potentiostat, adjusting pH of the solution and adding ferrous sulfate heptahydrate to the solution, controlling plate spacing, continuously introducing air through aeration device at the cathode and investing the degradation of organic matter in wastewater by replacing different working electrodes under the condition of same voltage or current density.