Application of anodic driven and bimetallic doping strategies in peroxymonosulfate-based fenton-like reactions

The efficient application of Fenton-like reactions for pollutant removal remains a challenge. Herein, a synergistic biochar-supported anodic driven and Fe/Co co-doping strategy in boosting performance of peroxymonosulfate (PMS)-based Fenton-like reactions was developed. The bimetallic-doped biochar (Fe-Co-UBC) exhibited the enhanced contents of pyrrole nitrogen and oxygen vacancies (Ov). The prepared Fe-Co-UBC@Ti anode as PMS activator displayed a high PMS activation ability in pollutant removal, owing to the synergistic effects of anodic driven and Fe/Co co-doping. As a result, in the anodic reaction system (E/Fe-Co-UBC@Ti/PMS), the pollutant removal efficiencies achieved 98.29 % within 1 h, which was much higher than these in other reaction systems. Results of Electron paramagnetic resonance spectrometer (EPR) test and quenching experiment indicated that the yields of generated active species were significantly enhanced. Additionally, the generated non-radical species (O-1(2)) and radicals (O-2(center dot-), OH center dot, SO4 center dot-) were identified as the contributors toward pollutant removal, and O-1(2) was the product of the dismutation reaction of O-2(center dot-). Toxicological analysis of degradation intermediates showed that TC was effectively decomposed and its toxicity was reduced, furthermore, the possible degradation pathways were proposed. This work offered a novel perspective on fabricating an efficient electro-assisted catalyst for PMS-based Fenton-like reactions.