Preparation of composite electrode and application of composite electrode in coupling dielectric barrier plasma discharge treatment of wastewater

The invention discloses preparation of a composite electrode and application of the composite electrode in wastewater treatment through coupling dielectric barrier plasma discharge, conductive carbon cloth is used as a substrate, and a high-temperature calcination method and a hydrothermal method are adopted to load a non-metal compound graphite carbon nitride/metal compound copper sulfide on the carbon cloth in situ; the silver nanoparticles are doped in the precursor electrode by adopting a soaking-reduction method, so that the photoelectric response performance of the composite electrode is improved; placing the prepared composite electrode in a reaction container as a reaction electrode, immersing the composite electrode in wastewater to be treated, then placing the reaction container filled with the composite electrode and the wastewater to be treated in a dielectric barrier discharge area of a dielectric barrier discharge reactor, and adjusting discharge voltage for reaction. According to the invention,