Effect of iron-based oxide-modified electrodes on the selectivity of carbon chain elongation metabolites in electro-fermentation system

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-05-03 DOI:10.1016/j.biortech.2025.132588

Xiaoyan Sun , Yanan Yin , Hui Chen , Lei Zhao , Cheng Wang , Jianlong Wang

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Abstract

This study explored the electrode modification by iron-based materials (IBM) including Fe₂O₃, Fe₃O₄, and FeN in the aim of promoting the medium-chain fatty acids (MCFA) production by electro-fermentation (EF). Results showed that the modification of cathodes with IBM increased MCFA production by 15 %-169 %. FeN exhibited the best performance, achieved the maximum MCFA production of 4450.2 mg COD/L and triggered longer-chain MCFA (i.e., caprylate) production of 211.7 mg COD/L. Electrochemical analyses demonstrated that IBM modification promoted the electrochemical activity of electrodes by reducing the charge transfer resistance by 15–62 %. Microbial analysis illustrated that IBM modification promoted microbial cooperation in the system by enriching chain elongation (CE) functional microorganisms (Fermentimonas sp., Blautia sp. and Anaerosalibacter sp.) and electrochemically active bacteria (Bacillus sp.) to facilitate MCFA generation. Metabolic pathways analysis indicated that IBM modification significantly promoted the production of Acetyl-CoA for the CE process and enhanced the relative abundances of functional genes involved in reverse β-oxidation (RBO) pathway.

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铁基氧化物修饰电极对电发酵体系中碳链延伸代谢物选择性的影响

本研究探讨了利用Fe2O3、Fe3O4和FeN等铁基材料（IBM）对电极进行修饰，以促进电发酵生产中链脂肪酸（MCFA）。结果表明，用IBM修饰阴极可使MCFA产量提高15% ~ 169%。FeN表现最好，最大MCFA产量为4450.2 mg COD/L，引发长链MCFA（即辛酸盐）产量为211.7 mg COD/L。电化学分析表明，IBM改性通过降低15 - 62%的电荷转移电阻，提高了电极的电化学活性。微生物分析表明，IBM修饰通过富集链伸长（CE）功能微生物（Fermentimonas sp.、Blautia sp.和Anaerosalibacter sp.）和电化学活性细菌（Bacillus sp.）促进了系统中微生物的合作，促进了MCFA的生成。代谢途径分析表明，IBM修饰显著促进了CE过程中乙酰辅酶a的产生，并提高了反β-氧化（RBO）途径相关功能基因的相对丰度。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.