Imperative role of applied potential and inorganic carbon source on acetate production through microbial electrosynthesis
Imperative role of applied potential and inorganic carbon source on acetate production through microbial electrosynthesis
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DOI：
10.1016/j.jcou.2016.03.003
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发表时间：
2016-09-01
影响因子：
7.7
通讯作者：
Pant, Deepak
中科院分区：
文献类型：
--
作者：
Mohanakrishna, Gunda;Vanbroekhoven, Karolien;Pant, Deepak
微生物电合成（MES）是一种通过生物阴极还原二氧化碳（CO2）产生有机分子的新技术。 MES 系统是一种混合设备，将生物和燃料电池的组件组合在一个系统中，利用廉价的基质产生化学品/能源。本研究评估了阴极电位（-800 mV 和 -600 mV）对使用富集的产乙酸菌作为生物催化剂在 30 摄氏度下使用石墨和 VITO 碳电极分别作为阴极和阳极将 CO2 还原为乙酸的影响。第一阶段以碳酸氢盐作为碳源的评估继续到第二阶段，以气态CO2作为碳源。在-800 mV 的两个阶段中都显示出更高的乙酸盐生产效率。阴极电位为-800 mV 的MES 反应器在第一和第二阶段分别显示4.05 和5.45 g 乙酸盐/L。将系统的碳源从碳酸氢盐更改为二氧化碳会对性能产生积极影响。此外，操作模式从连续式改为间歇式，醋酸盐产率得到提高，这也证明了性能的重现性和稳定性。连续供应 CO2 使 pH 值保持在接近中性的水平，这可能解释了系统中产生的乙醇的痕迹。 -800 mV 操作时的库仑效率也高于 -600 mV 操作时的库仑效率。 (C) 2016 Elsevier Ltd. 保留所有权利。
Microbial electrosynthesis (MES) is a novel technology that produces organic molecules from the reduction of carbon dioxide (CO2) at biocathode. MES system is a hybrid device that combines components of biological and fuel cells in a single system for chemicals/energy generation from inexpensive substrates. Present study evaluates the influence of cathodic potentials (-800 mV and -600 mV) on reduction of CO2 to acetate using enriched acetogenic bacteria as the biocatalyst at 30 degrees C using graphite and VITO carbon electrodes as cathode and anode respectively. The first stage of evaluation of bicarbonate as carbon source was continued to second stage where gaseous CO2 used as C source. In both the stages -800 mV showed higher acetate production efficiency. MES reactor with cathodic potential of -800 mV showed 4.05 and 5.45 g acetate/L respectively during first and second stage. Changing the carbon source of the systems from bicarbonate to CO2 positively influence the performance. Moreover, change in operation mode from continuous to batch resulted in improved acetate production rate, which also proved that the performance was reproducible and stable. Continuous CO2 supply maintained the pH near neutral which might explain the traces of ethanol produced in the system. Higher coulombic efficiency was also registered with -800 mV operation than -600 mV. (C) 2016 Elsevier Ltd. All rights reserved.