Internal cycling of Fe/Fe within FeO on cathode promotes green degradation of reactive brilliant red X-3B on anode.

Reactive brilliant red X-3B (RBRX-3B) wastewater is difficult to decolourise, not readily biodegradable, and large in quantity. Therefore, the efficient removal of RBRX-3B is crucial. In this paper, a green and efficient electrochemical-electro-Fenton system with FeO-modified carbon felt bag cathode (ECEF-FeO) was set up to degrade RBRX-3B wastewater.