Wang Hui, Song Hailiang, Yu Ran, Cao Xian, Fang Zhou, Li Xianning
School of Energy and Environment, Southeast University, Nanjing, 210096, China.
Environ Sci Pollut Res Int. 2016 Jul;23(13):13147-54. doi: 10.1007/s11356-016-6477-8. Epub 2016 Mar 23.
The soil microbial fuel cell (MFC) is a promising biotechnology for the bioelectricity recovery as well as the remediation soil. Moreover, there were no studies on the heavy metal pollution in a soil MFC yet. A soil MFC was constructed to remediate the contaminated soil, and the electric field was generated from the oxidation of the acetate at the anode. We demonstrated the copper migration, the power generation, and the pH variation in the soil and the electrodes. The maximal voltage and the power density of 539 mV and 65.77 m W/m(2) were obtained in the soil MFC. The chemical fractionation of copper (Cu) was analyzed with a modified BCR sequential extraction method. The soluble Cu form and the total Cu contents from the anode to the cathode increased, and the difference between them kept growing over time. The Cu fractions in the soil and the electrodes were converted with the change of the dramatic pH from the anode to the cathode. There was a focusing effect leading to the change of the Cu forms, and the extractable acid form content increased in the three fifths where the acid and the alkali fronts met.
土壤微生物燃料电池（MFC）是一种用于生物电回收以及土壤修复的很有前景的生物技术。此外，目前尚无关于土壤MFC中重金属污染的研究。构建了一个土壤MFC来修复受污染土壤，阳极处的乙酸氧化产生电场。我们展示了土壤和电极中的铜迁移、发电以及pH变化。土壤MFC中获得的最大电压和功率密度分别为539 mV和65.77 mW/m²。采用改进的BCR连续萃取法分析了铜（Cu）的化学形态。从阳极到阴极，可溶性铜形态和总铜含量增加，且它们之间的差异随时间不断增大。随着从阳极到阴极pH值的急剧变化，土壤和电极中的铜形态发生了转变。存在一种聚焦效应导致铜形态发生变化，在酸和碱前沿相遇的五分之三处，可提取酸形态的含量增加。
