In-situ fabrication from MOFs derived MnxCo3-x@C modified graphite felt cathode for efficient electro-Fenton degradation of ciprofloxacin

Since high degradation efficiency and environmental friendliness, the Electro-Fenton technology has been widely applied to remove antibiotics in wastewater. In-situ loading of electrochemically active metals on graphite felt (GF) is considered as a promising strategy for improving its electrocatalytic activity and reusability. Here, a series of Mn/Co MOFs derivatives modified graphite felt cathodes (Mn x Co 3-x @C-GF) were fabricated without any binder, which was used for the treatment of ciprofloxacin (CIP). The morphology, pore structure and electrochemical activity of Mn x Co 3-x @C-GF changed by adjusting the ratio of Mn/Co in the MOF-74 precursor. Owning to the optimized Mn/Co ratio, Mn 2 Co 1 @C-GF exhibited the most excellent catalytic ability with hierarchical porous structure and faster electron transfer . The results showed that the CIP degradation efficiency could reach 99.8% in 60 min. Mn 2+/3+/4+ and Co 3+/2+ enhanced the generation of active radicals (·OH) by Fenton-like reaction and further improved degradation performance. In addition, the cathode had maintained good stability during four cycles. This work provides an alternative strategy for fabricating efficient self-supporting cathode materials in the future.