Antibiotic Degradation via Fenton Process Assisted by a 3-Electron Oxygen Reduction Reaction Pathway Catalyzed by Bio-Carbon–Manganese Composites Fajardo-Puerto, Edgar Elmouwahidi, Abdelhakim Bailón García, Esther Pérez-Cadenas, María Pérez Cadenas, Agustín Francisco Carrasco Marín, Francisco Olive wastewater Bio-carbon-manganese composite ORR electro Fenton Bio-carbon–manganese composites obtained from olive mill wastewater were successfully prepared using manganese acetate as the manganese source and olive wastewater as the carbon precursor. The samples were characterized chemically and texturally by N2 and CO2 adsorption at 77 K and 273 K, respectively, by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction. Electrochemical characterization was carried out by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). The samples were evaluated in the electro-Fenton degradation of tetracycline in a typical three-electrode system under natural conditions of pH and temperature (6.5 and 25 ◦C). The results show that the catalysts have a high catalytic power capable of degrading tetracycline (about 70%) by a three-electron oxygen reduction pathway in which hydroxyl radicals are generated in situ, thus eliminating the need for two catalysts (ORR and Fenton). 2025-07-29T08:54:50Z 2025-07-29T08:54:50Z 2024-06-28 journal article Fajardo-Puerto, E.; Elmouwahidi, A.; Bailón-García, E.; Pérez-Cadenas, M.; Pérez-Cadenas, A.F.; Carrasco-Marín, F. Antibiotic Degradation via Fenton Process Assisted by a 3-Electron Oxygen Reduction Reaction Pathway Catalyzed by Bio-Carbon–Manganese Composites. Nanomaterials 2024, 14, 1112. https://doi.org/10.3390/nano14131112 https://hdl.handle.net/10481/105813 10.3390/nano14131112 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional MDPI