Electrochemical generation of H*-•OH redox pair for rapid removal of refractory nitro-organic micropollutants
Date
2025
Authors
Li, Y.
Yan, M.
Lin, H.
Wang, S.
Duan, X.
Wu, X.L.
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Journal article
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Applied Catalysis B: Environmental, 2025; 361:124663-1-124663-10
Statement of Responsibility
Yu Li, Minjia Yan, Hongjun Lin, Shaobin Wang, Xiaoguang Duan, Xi-Lin Wu
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Abstract
This study developed an innovative reduction-oxidation coupling process for treatment of refractory organic wastewater. We constructed a series of N5-coordinated transition metals (TMs) (TMs = Mn, Fe, Co, Ni, Cu) singleatom sites supported on nitrogen-rich carbon nitride (SA-TM-C3N5) for electrochemical generation of the surfaceadsorbed hydrogen atom (H*) and hydroxyl radical (•OH). The SA-Co-C3N5 exhibited the highest activity for production of the H*-•OH redox pair, which effectively degraded refractory nitro-organic micropollutants via the parallel reduction-oxidation pathways. The SA-Co-C3N5-mediated electro-Fenton-like system showed high removal efficiency (99 %) and mineralization capacity (78 %) toward metronidazole (MNZ) with low energy consumption (0.019 kWh (g TOC)–1 ). The trifunctional properties of the H* have contributed to the reduction of nitro compounds, the 2e– ORR for H2O2 production and the Fenton-like catalysis for •OH generation. This work sheds lights on the development of advanced reduction-oxidation coupling process for green and sustainable water purification.
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