Cathode catalyst, preparation thereof and method for treating tetracycline hydrochloride wastewater containing oxalate in heterogeneous electro-Fenton-electric flocculation system by applying cathode catalyst

The invention discloses a cathode catalyst, preparation thereof and a method for treating tetracycline hydrochloride wastewater containing oxalate in a heterogeneous electro-Fenton-electric flocculation system, and belongs to the technical field of electrochemical wastewater treatment. The method is based on a heterogeneous electro-Fenton-electric flocculation system. Oxalates in the wastewater are removed through the electric flocculation system, the floc forming process is optimized through the electro-Fenton-electric flocculation system, and the tetracycline hydrochloride removal effect of the system is improved; an electro-Fenton-electric flocculation system is constructed on the basis that the optimized electro-Fenton system is coupled with an electric flocculation system, formation of flocs in the electric flocculation process is promoted under the action of a nitrogen-doped interlayer electrode through the flocs generated in the electric flocculation process in the system, and the contribution of the e