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解读在发电和COD降解上的差异化性能,由Rhodopseudomonas主导的生物阳极在明亮或黑暗中进行
Xiaoyun Li1, Guoqiang Zhan2, Jingting Wang2
1CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, PR China; College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China.
Chemosphere
|May 12, 2024
概括
光合作用增强了由Rhodopseudomonas占主导地位的微生物群落的有机物降解,但降低了生物阳极中的coulombic效率 (CE). 微生物社区转移和电子转移机制解释了光微生物燃料电池在光明和黑暗条件下的性能差异.
科学领域:
- 微生物学 微生物学
- 电化学 电化学 电化学
- 环境科学 环境科学
背景情况:
- 无氧光热细菌是有希望的生物阳极催化剂.
- 在开放的生物电化学系统中,混合培养是不可避免的.
- 了解光暗性能对于光微生物燃料电池至关重要.
研究的目的:
- 调查Rhodopseudomonas占主导地位的混合文化的差异化电力发电在光明与黑暗.
- 阐明光合作用对有机物降解和电子转移的影响.
- 分析微生物社区的转移及其对绩效的影响.
主要方法:
- 有机物 (OM) 降解速率的动力学研究.
- 电化学分析:循环电压测量 (CV),电化学阻抗光谱 (EIS).
- 微生物社区分析 (例如16S rRNA测序).
- 扫描电子显微镜 (SEM) 用于生物膜形态学.
主要成果:
- 光合作用提高了OM降解率的9倍,但降低了coulombic效率 (CE).
- 作为OM燃料的CO2固定/H2生产的一部分,减少电子转移基质.
- 较高的COD度增加了电荷传递电阻 (Rct).
- 浅色生物膜显示间接的电子转移;暗色生物膜显示直接的电子转移.
- Rhodopseudomonas在光明中占主导地位,Geobacter在黑暗中占主导地位,影响发电.
结论:
- 混合光培养物在光明与黑暗中表现出明显的发电和污染物去除.
- 光合作用影响基质利用和电子转移通路.
- 微生物社区的组成是光微生物燃料电池性能的一个关键因素.
- 研究结果为优化光微生物燃料电池的发电提供了洞察力.
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