Bioelectrochemical Reduction of Fe(II)EDTA-NO in a Biofilm Electrode Reactor: Performance, Mechanism, and Kinetics.
Bioelectrochemical Reduction of Fe(II)EDTA-NO in a Biofilm Electrode Reactor: Performance, Mechanism, and Kinetics.
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DOI：
10.1021/acs.est.5b05861
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发表时间：
2016-03
影响因子：
11.4
通讯作者：
Yinfeng Xia;Jingkai Zhao;Mei-Nan Li;Shihan Zhang;Sujing Li;Wei Li
中科院分区：
文献类型：
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作者：
Yinfeng Xia;Jingkai Zhao;Mei-Nan Li;Shihan Zhang;Sujing Li;Wei Li
提出了一种生物膜电极反应器（BER），以有效地再生Fe（II）EDTA，从烟道气中去除NOx的溶剂，从Fe（II）EDTA-NO，废溶液。在这项研究中，性能，机制和动力学的生物电化学还原Fe（II）EDTA-NO进行了研究。通过测定BER和非生物电极反应器中的氮元素平衡，研究了Fe（II）EDTA-NO还原的途径。实验结果表明，螯合NO（Fe（II）EDTA-NO）以N2 O为中间体还原为N2。然而，NO的氧化发生在非生物反应器中没有Fe（II）EDTA。此外，在电的帮助下，N2 O的积累受到抑制。通过电子守恒分析，也证实了Fe（II）EDTA-NO还原的优势电子供体。在葡萄糖和阴极电子的存在下，使用Fe（II）EDTA作为电子供体，约87%的Fe（II）EDTA-NO被还原，而阴极电子用于将Fe（III）EDTA还原为Fe（II）EDTA。计算了Fe（II）EDTA-NO生物电还原的米氏动力学常数。Fe（II）EDTA-NO的最大还原速率为13.04 mol m（-3）h（-1），比传统生物滤池高50%。
A biofilm electrode reactor (BER) is proposed to effectively regenerate Fe(II)EDTA, a solvent for NOx removal from flue gas, from Fe(II)EDTA-NO, a spent solution. In this study, the performance, mechanism, and kinetics of the bioelectrochemical reduction of Fe(II)EDTA-NO were investigated. The pathways of Fe(II)EDTA-NO reduction were investigated via determination of nitrogen element balance in the BER and an abiotic electrode reactor. The experimental results indicate that the chelated NO (Fe(II)EDTA-NO) is reduced to N2 with N2O as an intermediate. However, the oxidation of NO occurred in the absence of Fe(II)EDTA in abiotic reactors. Furthermore, the accumulation of N2O was suppressed with the help of electricity. The preponderant electron donor for reduction of Fe(II)EDTA-NO was also confirmed via analysis of the electron conservation. About 87% of Fe(II)EDTA-NO was reduced using Fe(II)EDTA as the electron donor in the presence of both glucose and cathode electrons while the cathode electrons were utilized for the reduction of Fe(III)EDTA to Fe(II)EDTA. Michaelis-Menten kinetic constants of bioelectrochemical reduction of Fe(II)EDTA-NO were also calculated. The maximum reduction rate of Fe(II)EDTA-NO was 13.04 mol m(-3) h(-1), which is 50% higher than that in a conventional biofilter.