▎ 摘　　要

NOVELTY - Preparing graphene-magnetite conductive framework electrode involves: mixing a soluble iron salt solution with a pH of 6.5-7.5, a culture medium, and graphene, introducing nitrogen gas, adding Geobacter Sulfurreducens thallus to perform reduction reaction of soluble iron salts, and centrifuging to obtain graphene-magnetite-Geobacter sulfurreducens thallus; mixing with Nafion (RTM: Sulfonated tetrafluoroethylene based fluoropolymer-copolymer) solution, and coating the resulting suspension on a surface of a graphite rod electrode. USE - The method is useful for preparing graphene-magnetite conductive framework electrode used in treatment of petrochemical wastewater (all claimed). ADVANTAGE - The method: improves electron transfer distance due to framework constructed; and increases the surface roughness of the graphite rod electrode by modifying the conductive framework on the surface of the graphite rod electrode, which enriches microorganisms, increases the amount of electroactive microorganisms to improve the electron transfer ability when the load of microorganisms increases, and is more conducive to the transmission of electrons because the material of the modified layer is conductive material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) the graphene-magnetite conductive framework electrode, which comprises a graphite rod electrode, and a modified layer, which is coated on the surface of the graphite rod electrode, and includes graphene, magnetite, and Geobacter sulfurreducens thallus; and (2) treatment of petrochemical wastewater, which involves subjecting a three-electrode system to enrichment and cultivation in a mixed solution of a suspension containing electroactive microorganisms and a phosphate buffer to obtain a degradable microbial film on the surface of the graphene-magnetite conductive framework electrode. The mixed solution further includes a carbon source. The three-electrode system uses the graphene-magnetite conductive framework electrode as a working electrode, a platinum sheet as a counter electrode, and silver/silver chloride as a reference electrode. The mixed solution is replaced with the petrochemical wastewater to be treated according to the above method, and the petrochemical wastewater is degraded to obtain the treated petrochemical wastewater.