▎ 摘　　要

NOVELTY - Preparing rare earth element doped graphene electrode comprises (i) taking iron, platinum, cobalt or conductive glass as a substrate and preparing a base sheet by chemical vapor deposition; (ii) placing the base sheet in a sealed heating furnace under argon, high temperature preheating for 4-6 hours, and maintaining constant temperature of the reaction chamber and argon gas flow rate; (iii) preparing rare earth element doped graphene thin film; and (iv) maintaining constant flow rate of argon and cooling the electrode to room temperature. USE - The graphene electrode is useful for wastewater treatment (claimed). ADVANTAGE - The graphene electrode allows oxidative degradation of organic matter in the wastewater, reduces COD value in wastewater, ensures fast processing of wastewater, is non-toxic, and can be reused. DETAILED DESCRIPTION - Preparing rare earth element doped graphene electrode comprises (i) taking iron, platinum, cobalt or conductive glass as a substrate and preparing a base sheet by chemical vapor deposition; (ii) placing the base sheet in a sealed heating furnace under argon, high temperature preheating for 4-6 hours, and maintaining constant temperature of the reaction chamber and argon gas flow rate; (iii) uniformly dispersing the graphene in water, methanol, ethanol and isopropyl alcohol solvent, mixing the solvent and mixed solution of rare earth element nitrate and sulfate to prepare graphene oxide and rare earth element nitrate, sulfate mixed solution, under the control of the precision flow pump, slowly injecting the graphene and the rare earth element nitrate and the sulfate mixed solution into the closed reaction chamber through the capillary tube under the protection of the argon gas, and high temperature reacting for 4-6 hours; and (iv) stopping injection of the graphene oxide and rare earth element nitrate, sulfate mixed solution, closing the electric furnace, maintaining constant flow rate of argon and naturally cooling the electrode to room temperature.