Relationship between bioelectrochemical copper migration, reduction and electricity in a three-chamber microbial fuel cell
Relationship between bioelectrochemical copper migration, reduction and electricity in a three-chamber microbial fuel cell
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三室微生物燃料电池中生物电化学铜迁移、还原与电的关系
DOI：
10.1016/j.chemosphere.2019.125097
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发表时间：
2020
期刊：
影响因子：
8.8
通讯作者：
Li Xianning
中科院分区：
文献类型：
--
作者：
Wang Hui;Long Xizi;Zhang Jingran;Cao Xian;Liu Shentan;Li Xianning
微生物燃料电池（MFC）可以去除和回收废水中的金属，但有相对较少的研究，从土壤中去除金属MFCs。在这项研究中，我们开发了一个三室土壤MFC组成的阳极，污染的土壤，阴极室去除土壤中的重金属。土壤MFC的性能进行了研究，通过评估电流，电压和铜迁移，还原之间的关系。所研制的土壤微生物燃料电池成功地还原和去除了铜，在阴极中的铜去除率超过90%后，只有7天的操作。外加电阻对土壤微生物燃料电池的性能有显著影响，其性能取决于阴极极化。阴极中的pH也取决于外电阻。较低的外部电阻与较低的pH值，较高的铜去除效率，和更大的量在阴极中删除。基于连续分馏，酸可提取和可还原的馏分是主要的三室土壤MFC内迁移的馏分。通过增加外电阻来提高三室土壤微生物燃料电池的输出电压，可以促进铜的迁移，富集阴极附近的铜，有利于铜的去除。因此，所开发的三室土壤MFC不仅支持重金属从土壤向阴极迁移，而且还可以通过调节土壤MFC产生的电流或电压来实现阴极中重金属的还原。
Microbial fuel cells (MFCs) can remove and recover metals in wastewater; however, there are relatively few studies of metal removal from soil by MFCs. In this study, we developed a three-chamber soil MFC consisting of an anode, contaminated soil, and cathode chamber to remove heavy metals from soil. The performance of the soil MFC was investigated by assessing the relationships among current, voltage, and Cu migration, and reduction. The developed soil MFC successfully reduced and removed Cu, and the Cu removal efficiency in the cathode surpassed 90% after only 7 days of operation. External resistance had a remarkable effect on the performance of the soil MFC which was depended on cathodic polarization. The pH in the cathode also depended on the external resistance. Lower external resistance were associated with lower pH values, higher Cu removal efficiencies, and greater amounts removed in the cathode. Based on sequential fractionation, the acid-extractable and reducible fractions were the main fractions that migrated within the three-chamber soil MFC. Enhancing the voltage output in the three-chamber soil MFC by increasing the external resistance promoted Cu migration, enriched Cu near the cathode, and facilitated Cu removal. Therefore, the developed three-chamber soil MFC not only supports heavy metal migration from soil towards the cathode, but can also realize reduction of heavy metals in the cathode by adjusting the current or voltage generated by the soil MFC.