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Study on the selective regulation of microbial community structure in microbial fuel cells by magnetic field-coupled magnetic carbon dots.

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Titel: Study on the selective regulation of microbial community structure in microbial fuel cells by magnetic field-coupled magnetic carbon dots.
Autoren: Zhao C; Hebei Key Laboratory of Energy Storage and Integrated Energy Systems, North China Electric Power University, Baoding, Hebei Province 071003, PR China. Electronic address: czhao@ncepu.edu.cn., Song Y; Hebei Key Laboratory of Energy Storage and Integrated Energy Systems, North China Electric Power University, Baoding, Hebei Province 071003, PR China. Electronic address: yfsong@ncepu.edu.cn., Chen H; Hebei Key Laboratory of Energy Storage and Integrated Energy Systems, North China Electric Power University, Baoding, Hebei Province 071003, PR China. Electronic address: hdchw66@126.com., Li Y; Hebei Key Laboratory of Energy Storage and Integrated Energy Systems, North China Electric Power University, Baoding, Hebei Province 071003, PR China. Electronic address: yanminli@ncepu.edu.cn., Lei A; Hebei Key Laboratory of Energy Storage and Integrated Energy Systems, North China Electric Power University, Baoding, Hebei Province 071003, PR China. Electronic address: leiao@ncepu.edu.cn., Wu Q; Hebei Key Laboratory of Energy Storage and Integrated Energy Systems, North China Electric Power University, Baoding, Hebei Province 071003, PR China. Electronic address: wuqianyun@ncepu.edu.cn., Zhu L; Hebei Key Laboratory of Energy Storage and Integrated Energy Systems, North China Electric Power University, Baoding, Hebei Province 071003, PR China. Electronic address: 120192102079@ncepu.edu.cn., He Q; China Xiong'an Group Smart Energy Co., Ltd, Xiong'an New Area, 071800, PR China. Electronic address: heqian@chinaxiongan.com.cn.
Quelle: Bioresource technology [Bioresour Technol] 2025 Dec; Vol. 437, pp. 133065. Date of Electronic Publication: 2025 Aug 05.
Publikationsart: Journal Article
Sprache: English
Info zur Zeitschrift: Publisher: Elsevier Applied Science Country of Publication: England NLM ID: 9889523 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-2976 (Electronic) Linking ISSN: 09608524 NLM ISO Abbreviation: Bioresour Technol Subsets: MEDLINE
Imprint Name(s): Original Publication: Barking, Essex, England : New York, N.Y. : Elsevier Applied Science ; Elsevier Science Pub. Co., 1991-
MeSH-Schlagworte: Bioelectric Energy Sources*/microbiology , Carbon*/chemistry , Magnetic Fields* , Quantum Dots*/chemistry , Microbiota*, RNA, Ribosomal, 16S/genetics ; Electricity ; Bacteria/genetics ; Bacteria/metabolism
Abstract: Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Microbial fuel cells (MFCs), as a green energy technology that simultaneously enables electricity generation and wastewater treatment, exhibit performance that is highly dependent on the structural distribution of the microbial community. In this study, we investigated the effect of magnetic field (MF)-coupled magnetic carbon dots (N-CD/Fe 3 O 4 ) as a selective pressure on the structure of mixed microbial communities in an intermittent pulsating fluidized-bed bioelectrochemical reactor. Under a moderate magnetic field (15 mT), N-CD/Fe 3 O 4 were effectively adsorbed onto microbial cells and subsequently aggregated, significantly enhancing electron transfer within the community. The maximum power density reached 38.43 mW/m 2 , which is about 5.07 times that of the blank control group. 16S rRNA and metagenomic analyses showed that the MF (15 mT) group exhibited significant enrichment of typical electroactive bacteria (40.32 %), such as Geobacter, which directly contributed to improved power production performance. In contrast, under a stronger magnetic field (60 mT), the abundance of typical electroactive bacteria (17.94 %) decreased, while atypical electroactive (38 %) and metabolically complementary bacteria that facilitate syntrophic cooperation (42.85 %) showed adjusted abundances, forming a functionally more balanced microbial community with improved adaptability to real wastewater conditions. This study demonstrates that by tuning magnetic field intensity and coupling with magnetic carbon dots, the structure and function of microbial communities can be directionally regulated, providing an effective strategy for developing electroactive inocula with enhanced power generation and wastewater adaptability.
(Copyright © 2025 Elsevier Ltd. All rights reserved.)
Contributed Indexing: Keywords: Biocompatibility; Electricity generation performance; Electroactive bacteria; Extracellular polymeric substances; Selective pressure
Substance Nomenclature: 7440-44-0 (Carbon)
0 (RNA, Ribosomal, 16S)
Entry Date(s): Date Created: 20250804 Date Completed: 20250903 Latest Revision: 20250903
Update Code: 20250904
DOI: 10.1016/j.biortech.2025.133065
PMID: 40759346
Datenbank: MEDLINE
Beschreibung
Abstract:Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br />Microbial fuel cells (MFCs), as a green energy technology that simultaneously enables electricity generation and wastewater treatment, exhibit performance that is highly dependent on the structural distribution of the microbial community. In this study, we investigated the effect of magnetic field (MF)-coupled magnetic carbon dots (N-CD/Fe <subscript>3</subscript> O <subscript>4</subscript> ) as a selective pressure on the structure of mixed microbial communities in an intermittent pulsating fluidized-bed bioelectrochemical reactor. Under a moderate magnetic field (15 mT), N-CD/Fe <subscript>3</subscript> O <subscript>4</subscript> were effectively adsorbed onto microbial cells and subsequently aggregated, significantly enhancing electron transfer within the community. The maximum power density reached 38.43 mW/m <sup>2</sup> , which is about 5.07 times that of the blank control group. 16S rRNA and metagenomic analyses showed that the MF (15 mT) group exhibited significant enrichment of typical electroactive bacteria (40.32 %), such as Geobacter, which directly contributed to improved power production performance. In contrast, under a stronger magnetic field (60 mT), the abundance of typical electroactive bacteria (17.94 %) decreased, while atypical electroactive (38 %) and metabolically complementary bacteria that facilitate syntrophic cooperation (42.85 %) showed adjusted abundances, forming a functionally more balanced microbial community with improved adaptability to real wastewater conditions. This study demonstrates that by tuning magnetic field intensity and coupling with magnetic carbon dots, the structure and function of microbial communities can be directionally regulated, providing an effective strategy for developing electroactive inocula with enhanced power generation and wastewater adaptability.<br /> (Copyright © 2025 Elsevier Ltd. All rights reserved.)
ISSN:1873-2976
DOI:10.1016/j.biortech.2025.133065