Research progress on using biological cathodes in microbial fuel cells for the treatment of wastewater containing heavy metals
Various types of electroactive microorganisms can be enriched to form biocathodes that reduce charge-transfer resistance, thereby accelerating electron transfer to heavy metal ions with high redox potentials in microbial fuel cells. Microorganisms acting as biocatalysts on a biocathode can reduce th...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-09-01
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| Series: | Frontiers in Microbiology |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmicb.2023.1270431/full |
| _version_ | 1797681834945937408 |
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| author | Hui Wang Hui Wang Pengxiang Zhai Xizi Long Jianghang Ma Yu Li Bo Liu Zhiqiang Xu Zhiqiang Xu |
| author_facet | Hui Wang Hui Wang Pengxiang Zhai Xizi Long Jianghang Ma Yu Li Bo Liu Zhiqiang Xu Zhiqiang Xu |
| author_sort | Hui Wang |
| collection | DOAJ |
| description | Various types of electroactive microorganisms can be enriched to form biocathodes that reduce charge-transfer resistance, thereby accelerating electron transfer to heavy metal ions with high redox potentials in microbial fuel cells. Microorganisms acting as biocatalysts on a biocathode can reduce the energy required for heavy metal reduction, thereby enabling the biocathode to achieve a lower reduction onset potential. Thus, when such heavy metals replace oxygen as the electron acceptor, the valence state and morphology of the heavy metals change under the reduction effect of the biocathode, realizing the high-efficiency treatment of heavy metal wastewater. This study reviews the mechanisms, primary influencing factors (e.g., electrode material, initial concentration of heavy metals, pH, and electrode potential), and characteristics of the microbial community of biocathodes and discusses the electron distribution and competition between microbial electrodes and heavy metals (electron acceptors) in biocathodes. Biocathodes reduce the electrochemical overpotential in heavy metal reduction, permitting more electrons to be used. Our study will advance the scientific understanding of the electron transport mechanism of biocathodes and provide theoretical support for the use of biocathodes to purify heavy metal wastewater. |
| first_indexed | 2024-03-11T23:50:46Z |
| format | Article |
| id | doaj.art-fee6b5bd0746477b9cfdfbba675f7cb2 |
| institution | Directory Open Access Journal |
| issn | 1664-302X |
| language | English |
| last_indexed | 2024-03-11T23:50:46Z |
| publishDate | 2023-09-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Microbiology |
| spelling | doaj.art-fee6b5bd0746477b9cfdfbba675f7cb22023-09-19T07:37:14ZengFrontiers Media S.A.Frontiers in Microbiology1664-302X2023-09-011410.3389/fmicb.2023.12704311270431Research progress on using biological cathodes in microbial fuel cells for the treatment of wastewater containing heavy metalsHui Wang0Hui Wang1Pengxiang Zhai2Xizi Long3Jianghang Ma4Yu Li5Bo Liu6Zhiqiang Xu7Zhiqiang Xu8State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, ChinaDepartment of Municipal and Environmental Engineering, School of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, ChinaDepartment of Municipal and Environmental Engineering, School of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, ChinaKey Laboratory of Typical Environmental Pollution and Health Hazards of Hunan Province, School of Public Health, Hengyang Medical School, University of South China, Hengyang, ChinaDepartment of Municipal and Environmental Engineering, School of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, ChinaDepartment of Municipal and Environmental Engineering, School of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, ChinaDepartment of Municipal and Environmental Engineering, School of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, ChinaState Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, ChinaDepartment of Municipal and Environmental Engineering, School of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, ChinaVarious types of electroactive microorganisms can be enriched to form biocathodes that reduce charge-transfer resistance, thereby accelerating electron transfer to heavy metal ions with high redox potentials in microbial fuel cells. Microorganisms acting as biocatalysts on a biocathode can reduce the energy required for heavy metal reduction, thereby enabling the biocathode to achieve a lower reduction onset potential. Thus, when such heavy metals replace oxygen as the electron acceptor, the valence state and morphology of the heavy metals change under the reduction effect of the biocathode, realizing the high-efficiency treatment of heavy metal wastewater. This study reviews the mechanisms, primary influencing factors (e.g., electrode material, initial concentration of heavy metals, pH, and electrode potential), and characteristics of the microbial community of biocathodes and discusses the electron distribution and competition between microbial electrodes and heavy metals (electron acceptors) in biocathodes. Biocathodes reduce the electrochemical overpotential in heavy metal reduction, permitting more electrons to be used. Our study will advance the scientific understanding of the electron transport mechanism of biocathodes and provide theoretical support for the use of biocathodes to purify heavy metal wastewater.https://www.frontiersin.org/articles/10.3389/fmicb.2023.1270431/fullmicrobial fuel cellbiocathodeheavy metal wastewatercathodic reductionelectron transfer |
| spellingShingle | Hui Wang Hui Wang Pengxiang Zhai Xizi Long Jianghang Ma Yu Li Bo Liu Zhiqiang Xu Zhiqiang Xu Research progress on using biological cathodes in microbial fuel cells for the treatment of wastewater containing heavy metals Frontiers in Microbiology microbial fuel cell biocathode heavy metal wastewater cathodic reduction electron transfer |
| title | Research progress on using biological cathodes in microbial fuel cells for the treatment of wastewater containing heavy metals |
| title_full | Research progress on using biological cathodes in microbial fuel cells for the treatment of wastewater containing heavy metals |
| title_fullStr | Research progress on using biological cathodes in microbial fuel cells for the treatment of wastewater containing heavy metals |
| title_full_unstemmed | Research progress on using biological cathodes in microbial fuel cells for the treatment of wastewater containing heavy metals |
| title_short | Research progress on using biological cathodes in microbial fuel cells for the treatment of wastewater containing heavy metals |
| title_sort | research progress on using biological cathodes in microbial fuel cells for the treatment of wastewater containing heavy metals |
| topic | microbial fuel cell biocathode heavy metal wastewater cathodic reduction electron transfer |
| url | https://www.frontiersin.org/articles/10.3389/fmicb.2023.1270431/full |
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