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2023-10-31

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cc-by-nc-nd (c) Elsevier B.V., 2023
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/206807

Accelerating Fe(III)/Fe(II) redox cycling in heterogeneous electro-Fenton process via S/Cu-mediated electron donor-shuttle regime

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https://doi.org/10.1016/j.apcatb.2023.123457

Abstract

In this study, we developed a Cu0.5Fe2.5S4 nanocatalyst through facile sulfidation of the Cu-MIL-88B(Fe) precursorto expedite surface Fe(III) reduction and enhance H2O2 activation in the heterogeneous electro-Fenton(HEF). The as-prepared catalyst possesses relatively large specific surface area and uniformly dispersed metalactive sites. The Cu0.5Fe2.5S4-catalyzed HEF system allowed complete removal of naproxen with minimal metalleaching, surpassing that of Cu-MIL-88B(Fe) or Fe3S4. Quantitative XPS analysis, electrochemical characterizationand density functional theory calculations reveal an electron donor-shuttle regime in which S2- and Cuspecies serve as the electron donor and shuttle, respectively. The Cu species significantly accelerate the internalelectron transfer between S and Fe and mitigate the dissolution of the adjacent iron sites, securing the sustainablereducing capacity. Moreover, Cu0.5Fe2.5S4-based HEF exhibits great practicability for treatment of various organicsin urban wastewater. This study opens new avenue for addressing the challenge of sluggish Fe(III)/Fe(II)cycling in HEF.

Subject

Electroquímica, Ferro, Transport d'electrons

Subject (English)

Electrochemistry, Iron, Electron transport

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Articles publicats en revistes (Ciència dels Materials i Química Física)

Citation

WANG, Chao, et al. Accelerating Fe(III)/Fe(II) redox cycling in heterogeneous electro-Fenton process via S/Cu-mediated electron donor-shuttle regime. Applied Catalysis B-Environmental. 2023. Vol. 342, num. 1-12. ISSN 0926-3373. [consulted: 10 of August of 2026]. Available at: https://hdl.handle.net/2445/206807

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