重新评估基于铁的电流采集器对生物电化学甲基生成的贡献:作用和机制
Yan Tian1, Dandan Liang1, Da Li1
1State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
Environmental science & technology
|December 14, 2023
概括
微生物电合成 (MES) 细胞中铁电流收集器的腐蚀自然增强生物膜的发展. 这促进了二氧化碳 (CO2) 电甲生成,减少了启动时间,增加了甲 (CH4) 产量.
科学领域:
- 生物电化学系统 生物电化学系统
- 微生物的电合成.
- 可再生能源和可持续发展
背景情况:
- 基于金属的电流采集器对于微生物电合成 (MES) 阴极的电子传递至关重要.
- 目前收集器腐蚀对生物膜形成和电甲基生成的影响在很大程度上尚未研究.
研究的目的:
- 调查基于铁 (Fe) 的电流收集器腐蚀对MES中CO2电甲生成的影响.
- 阐明铁腐蚀产品增强微生物活动和甲生产的机制.
主要方法:
- 使用了带有或没有基于Fe的电流收集器的微生物电合成 (MES) 细胞 (Bio FeCF与Bio CF).
- 进行电化学分析,研究电子转移和催化性能.
- 分析了与细胞外电子吸收相关的生物膜组成和基因表达.
主要成果:
- 在Fe电流收集器的现场腐蚀装饰了阴极,显著改善了CO2电甲生成.
- MES启动时间缩短了三分之二以上,甲 (CH4) 生产速度增加了3.5倍.
- 沉积物充当电子穿器和H2生产催化剂,减少甲素对电活性细菌 (EAB) 的依赖,并增加细胞外电子吸收基因丰富度.
结论:
- 基于腐蚀性Fe的电流采集器在增强CO2电甲生成方面发挥着多种有益的作用.
- 铁腐蚀产品促进了对甲基生物的直接电子转移,从而提高了系统的整体性能.
- 这一发现为优化微生物电合成过程以生产甲提供了一种新的策略.
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