Electron transfer mechanism of biocathode in a bioelectrochemical system coupled with chemical absorption for NO removal
Electron transfer mechanism of biocathode in a bioelectrochemical system coupled with chemical absorption for NO removal
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生物电化学系统中生物阴极的电子转移机制与化学吸收耦合去除 NO
DOI：
10.1016/j.biortech.2018.01.066
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发表时间：
2018
影响因子：
11.4
通讯作者：
Dongxiao Zhang
中科院分区：
文献类型：
--
作者：
Jingkai Zhao;Jingkai Zhao;Cheng Sun;Wei Li;Shihan Zhang;Shihan Zhang;Dongxiao Zhang
将具有Fe（III）EDTA和Fe（II）EDTA-NO还原功能的生物阴极应用于微生物电解池中，并与化学吸收耦合，用于烟气中NO的脱除。由于介导的电子转移被排除在相同的电化学表征的生物阴极之前和之后的48 h的连续操作，还原实验的配置文件表明，直接电子转移是主要机制的Fe（III）EDTA还原，而Fe（III）EDTA-NO主要是通过Fe（II）辅助自养反硝化。生物阴极的显微镜检查证实了皮利的存在，这被认为是用于电子传递的细菌纳米线。微生物群落分析表明，包括大肠杆菌在内的铁还原菌具有通过物理接触从电极上摄取电子的可能性。这些结果首次为我们深入了解多功能生物阴极中的电子传递和进一步强化生物还原过程的机理提供了依据。
A biocathode with the function of Fe(III)EDTA and Fe(II)EDTA-NO reduction was applied in a microbial electrolysis cell coupled with chemical absorption for NO removal from flue gas. As the mediated electron transfer was excluded by the same electrochemical characterizations of the biocathodes before and after a 48 h continuous operation, the profiles of reduction experiments indicated that direct electron transfer was the main mechanism of Fe(III)EDTA reduction, while Fe(III)EDTA-NO was mainly reduced via Fe(II)-assisted autotrophic denitrification. The microscopy of the biocathode confirmed the existence of pili, which was supposed to be bacterial nanowires for electron transfer. The analysis of microbial community revealed that iron-reducing bacteria, includingEscherichia coli, had the possibility of electron uptake from electrode via physical contact. These results first time gave us in-depth understanding of the electron transfer in the multifunctional biocathode and mechanism for further enhancement of the bioreduction processes.