Citation: Anqi LI, Wenjing YANG, Xueming LI, Yanfong REN. Performance and mechanism of a foam Ti/FeCo-Fe₂O₃-CoFe₂O₄/SnO₂-Sb anode for synergistic activation of peroxymonosulfate toward degradation of organic pollutants[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(5): 944-958. doi: 10.11862/CJIC.20250323 shu

Performance and mechanism of a foam Ti/FeCo-Fe₂O₃-CoFe₂O₄/SnO₂-Sb anode for synergistic activation of peroxymonosulfate toward degradation of organic pollutants

Anqi LI ^{1, 2,} ,
Wenjing YANG ² ,
Xueming LI ² ,
Yanfong REN ^1,,

1.
School of Biological and Chemical Engineering, Chongqing University of Education, Chongqing 400067, China
2.
School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China

Corresponding author: Yanfong REN, renyr@cque.edu.cn
Received Date: 22 October 2025
Revised Date: 27 January 2026

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To address the limited utilization efficiency of reactive species in conventional single electrochemical systems, we developed an electrochemical activation platform (Ti/FeCoO/SnO₂-Sb+PMS) that coupling peroxymonosulfate (PMS) with a Ti/FeCo-Fe₂O₃-CoFe₂O₄/SnO₂-Sb (named as Ti/FeCoO/SnO₂-Sb) composite anode. To overcome the inherent limitations of conventional SnO₂-Sb anodes in interfacial reaction kinetics and long-term operational stability, we introduced FeCoO as a key interlayer to build a hierarchical composite electrode. This design leverages the synergistic Fe and Co dual-metal sites to tailor the interfacial microenvironment, thereby achieving simultaneous enhancement in PMS activation efficiency and system stability. Performance evaluation showed that, within the Ti/FeCoO/SnO₂-Sb+PMS system, the Ti/Fe-Co/SnO₂-Sb anode delivered the best removal and mineralization of methyl orange (MO), with the removal efficiency of chemical oxygen demand (COD) markedly higher than that of the control system. In addition, acidic conditions favor PMS activation and further accelerate the degradation kinetics of MO. Compared with the Ti/SnO₂-Sb/PMS system without FeCoO middle layer, the Ti/FeCoO/SnO₂-Sb composite exhibited a more pronounced overall performance advantage. Mechanistic studies combining electrochemical analyses, electron paramagnetic resonance (EPR), and density functional theory (DFT) calculations indicate that the improved performance mainly arises from the composite interface effectively promoting direct electron transfer (DET) and strengthening electrochemical PMS activation. During degradation, superoxide radical (·O₂^-), hydroxyl radical (·OH), sulfate radical (SO₄^·-), and singlet oxygen (¹O₂) generation act synergistically, enabling efficient disruption of the conjugated structure of MO and sustained deep oxidation.
- electrocatalytic oxidation,
- radical and non-radical pathways,
- reaction mechanism,
- coupling,
- degradation pathways
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Performance and mechanism of a foam Ti/FeCo-Fe2O3-CoFe2O4/SnO2-Sb anode for synergistic activation of peroxymonosulfate toward degradation of organic pollutants

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通讯作者: 陈斌, bchen63@163.com

Performance and mechanism of a foam Ti/FeCo-Fe₂O₃-CoFe₂O₄/SnO₂-Sb anode for synergistic activation of peroxymonosulfate toward degradation of organic pollutants