Kinetics of biocathodic electron transfer in a bioelectrochemical system coupled with chemical absorption for NO removal
Kinetics of biocathodic electron transfer in a bioelectrochemical system coupled with chemical absorption for NO removal
复制标题
生物电化学系统中生物阴极电子转移动力学与化学吸收相结合以去除 NO
DOI：
10.1016/j.chemosphere.2020.126095
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发表时间：
2020
期刊：
影响因子：
8.8
通讯作者：
Jianmeng Chen
中科院分区：
文献类型：
--
作者：
Jingkai Zhao;Ke Feng;Shu-Hui Liu;Chi-Wen Lin;Shihan Zhang;Sujing Li;Wei Li;Jianmeng Chen
微生物电解池 (MEC) 一直在开发，用于在化学吸收-生物还原一体化工艺中增强吸收剂再生，以去除 NO。在这项工作中，同时分析了生物阴极沿 Fe(III)EDTA 和 Fe(II)EDTA-NO 还原的电子转移动力学。应用考虑法拉第效率的修正能斯特-莫诺动力学来描述 Fe(III)EDTA 还原的电子转移动力学。实验结果验证了模型预测的底物浓度、生物阴极电位对电流密度的影响。此外，从Fe(III)EDTA还原动力学的基础上，采用半实验方法，同时考虑直接电化学和生物电化学过程，建立了Fe(II)EDTA-NO还原的电子转移动力学。结果表明，所开发的模型可以很好地模拟电子转移动力学。这项工作不仅有助于提高生物阴极还原能力和电力利用效率，而且为该系统的工业规模化和应用提供了见解。
A microbial electrolysis cell (MEC) has been developing for enhanced absorbent regeneration in a chemical absorption-biological reduction integrated process for NO removal. In this work, the kinetics of electron transfer involved in the biocathodes along Fe(III)EDTA and Fe(II)EDTA-NO reduction was analyzed simultaneously. A modified Nernst-Monod kinetics considering the Faraday efficiency was applied to describe the electron transfer kinetics of Fe(III)EDTA reduction. The effects of substrate concentration, biocathodic potential on current density predicted by the model have been validated by the experimental results. Furthermore, extended from the kinetics of Fe(III)EDTA reduction, the electron transfer kinetics of Fe(II)EDTA-NO reduction was developed with a semi-experimental method, while both direct electrochemical and bioelectrochemical processes were taken into consideration at the same time. It was revealed that the developed model could simulate the electron transfer kinetics well. This work could not only help advance the biocathodic reduction ability and the utilization efficiency of electric power, but also provide insights into the industrial scale-up and application of the system.