铁基氧化物改性电极对电发酵系统中碳链延长代谢物的选择性的影响
Xiaoyan Sun1, Yanan Yin2, Hui Chen3
1Division of Materials Chemistry and New Energy Technology, INET, Tsinghua University, Beijing 100084, PR China; The State Key Laboratory of Advanced Refractories, Wuhan University of Science & Technology, Wuhan 430081, PR China.
Bioresource technology
|May 5, 2025
概括
电极的铁基材料修改显著提高了通过电气发酵 (EF) 产生的中链脂肪酸 (MCFA). 添加铁 (FeN) 电极显示出最高的产量,增强了微生物活动和MCFA生成的代谢途径.
科学领域:
- 电化学 电化学 电化学
- 微生物学 微生物学
- 生物技术是生物技术.
背景情况:
- 电发酵 (EF) 是一种有前途的技术,用于生产有价值的化学品.
- 优化电极材料对于提高EF效率至关重要.
- 基于铁的材料 (IBM) 为电极改造提供了潜力.
研究的目的:
- 研究铁基材料 (Fe2O3,Fe3O4,FeN) 对电极改造的影响,以通过EF改进中链脂肪酸 (MCFA) 的生产.
- 在MCFA产量和组成方面评估不同IBM修改电极的性能.
- 阐明导致增强MCFA生产的潜在电化学和微生物机制.
主要方法:
- 使用Fe2O3,Fe3O4和FeN进行电极修改.
- 进行电发酵实验以生产MCFA.
- 电化学分析 (例如电荷转移电阻).
- 微生物社区分析 (16S rRNA测序).
- 代谢途径分析.
主要成果:
- 通过IBM的修改,MCFA的产量增加了15%至169%.
- FeN电极实现了最高的MCFA产量 (4450.2毫克COD/L) 和酸盐产量 (211.7毫克COD/L).
- 根据IBM的修改,电极的电荷转移阻力降低了15%-62%.
- 链延长的丰富 (例如,Fermentimonas sp.) 和电化学活性细菌 (Bacillus sp.) 的存在. 这是观察到的.
- 增强了乙-CoA的产生和反向β-氧化途径的上调.
结论:
- 铁基材料的修改,特别是FeN,是一种有效的策略,可以提高电发酵中的MCFA产量.
- IBM的修改改进了电极的电化学活动,并促进了有益的微生物联盟.
- 增强的MCFA生产与改善的乙-CoA供应和逆β-氧化途径有关.
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