Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.187
Publication date: 16th December 2024
Among the electrochemical advanced oxidation processes (EAOPs) for wastewater treatment, which exhibit high effectiveness combined with green deployment, some of them primarily rely on the efficiency of anode materials in generating potent oxidants like hydroxyl radicals (•OH). Hence, the development of novel, cost-effective nickel-manganese-based anodes has been investigated in this work, aiming to revolutionize the electro-oxidation of organic pollutants. Key to this endeavor is the use of 3D porous conductive substrates, akin to those employed in redox-flow batteries and water electrolyzers. These substrates are crucial for maximizing the electrode-electrolyte interactions and facilitating efficient flow-through designs, thereby significantly boosting the EAOPs performance. The synthesis, characterization, and optimization of these Ni-Mn-based electrodes, including their physicochemical structure and electrochemical properties, have been studied. It has been found that by employing Ni-Mn-based materials as the active material and utilizing the high surface area of 3D substrates such as nickel foam and graphite felt, our electrodes achieved a remarkable 100% removal of phenol, coupled with an 80% reduction in chemical oxygen demand (COD), thus marking a significant advancement over traditional anodes. Comparative analyses with boron-doped diamond (BDD) and dimensionally stable anode (DSA) highlight the superior activity and efficiency of our anodes. Further, a detailed mechanistic study was undertaken to elucidate the electrochemical pathways and interactions. This investigation reveals an enhanced generation of hydroxyl radicals and other oxidizing species on the anode surface, justifying the observed degradation efficiency. The implications of these findings are substantial in the field of wastewater treatment. Developing our Ni-Mn oxides not only sets a new benchmark in pollutant degradation efficiency but also offers valuable insights into the electrochemical mechanisms underpinning EAOPs.
K.M. acknowledges the HYSOLCHEM project (grant agreement No. 101017928) financed by the EU Horizon 2020 research and innovation programme "A Way of Making Europe". J. J. Lado appreciates the Talento’s program of the Community of Madrid (Spain), which involves the project SELECTVALUE (2020-T1/AMB-19799). I.S. gratefully acknowledges financial support from project PID2022–140378OB-I00 (MCIN/AEI/10.13039/501100011033, Spain), co-funded by the EU.
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