A novel high-oxygen-evolution anode boosts microbial electrolysis for perfluorooctanoic acid removal
A novel biochar-based anode, modified with Fe/Zn and doped with Sn/Sb, was developed for perfluorooctanoic acid (PFOA) removal in a microbial electrolysis cell (MEC) system. Results indicated that the incorporation of these metals significantly enhanced the roughness and surface area of BC, creating...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
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| Series: | Desalination and Water Treatment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398625003078 |
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| Summary: | A novel biochar-based anode, modified with Fe/Zn and doped with Sn/Sb, was developed for perfluorooctanoic acid (PFOA) removal in a microbial electrolysis cell (MEC) system. Results indicated that the incorporation of these metals significantly enhanced the roughness and surface area of BC, creating a highly porous and heterogeneous structure that fostered bacterial adhesion and colonization. Additionally, the presence of metals improved electrochemical capabilities of electrode, facilitated extracellular electron transfer (EET) between bacterial cells and the anode, and positively influenced bacterial community structure for PFOA degradation. The application of electrical voltage facilitated interspecies electron transfer; however, excessively high voltage exerted a detrimental effect on PFOA degradation. Neutral conditions were conducive to microbial metabolism, leading to higher PFOA degradation rates, whereas high PFOA concentrations inhibited microbial activity, reducing degradation efficiency. Under optimal conditions of 0.5 V, pH 7, and an initial PFOA concentration of 20 mg/L, the MEC system with the Sn-Sb@Zn-BC/Ti anode achieved a PFOA degradation rate of 80.20 % after 15 days of continuous operation. This study demonstrates the potential of metal-BC anodes in MEC systems for effective PFOA wastewater treatment, offering new insights into mechanisms for enhancing PFOA degradation. |
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| ISSN: | 1944-3986 |