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An efficient and sustainable hybrid electrochemical system for heterogeneous electro-Fenton degradation of phenolic pollutants
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PRE
AI
S
Y
S
姜
X
朱
DOI：10.1016/j.cclet.2025.112193.png)
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Abstract
En 中文
The heterogeneous electro-Fenton (HEF) technology is a promising yet challenging approach for organic pollutant degradation. It is urgent to develop a catalyst for both highly efficient H2O2 and hydroxyl radical (center dot OH) generation with low energy consumption at neutral conditions. This study presents a bifunctional catalyst (CoPc/OCNTs/FeOF) synthesized by ultrasonic anchoring of FeOF onto cobalt phthalocyaninemodified oxidized carbon nanotubes. The catalyst demonstrated synergistic effects, achieving a 2.94-fold enhancement in H2O2 generation and a 3.85-fold increase in center dot OH yield compared to its individual components (CoPc/OCNTs and FeOF). At pH 6, the CoPc/OCNTs/FeOF cathode enabled nearly complete phenol removal within 90 min, with a high kinetic rate constant ( k ) of 0.04 84 8 min-1 , driven by cooperative oxidation from singlet oxygen (1 O2 ) and center dot OH. The system exhibited exceptional stability, inorganic ion tolerance, and broad applicability to real wastewaters, achieving 82.0 % total organic carbon (TOC) removal for phenol wastewater at a low energy consumption of 21.9 kWh kg-1 COD-1 . Moreover, sodium alginate-immobilized microalgae hydrogel was integrated into the HEF system to supply O2 in situ for the 2e-oxygen reduction reaction (ORR), eliminating energy-intensive mechanical aeration. Subsequent microalgal cultivation further removed 90.6 % of total nitrogen and 82.8 % of total phosphorus, showcasing a sustainable dual-function strategy for pollutant degradation and nutrient recovery. This work advances the design of efficient HEF catalysts and highlights the potential of microalgae-coupled systems for sustainable wastewater treatment. (c) 2026 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
Keywords:
Heterogeneous electro-fenton
OH electrogeneration
Wastewater treatment
Microalgae
ORR
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8.9
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1.2W
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3.8W
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