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Effects of cathode/anode electron accumulation on soil microbial fuel cell power generation and heavy metal removal.
Environ Res. 2021 07; 198:111217.ER

Abstract

Microbial fuel cells (MFCs) with different electrode configurations were constructed to study the mechanism of influence of multiple current paths on their electrical performance and the removal of heavy metals in soil. Three types of MFCs were constructed, namely, double anode-single cathode (DASC), single anode-dual cathode (SADC), and single anode-single cathode (SASC). The total electricity generation of the three kinds of MFC was similar: 143.44 × 10-3 mW, 114.90 × 10-3 mW, and 132.50 × 10-3 mW, respectively. However, the maximum voltage and cathode current density produced by a single current path differed significantly. The corresponding values were 0.27, 0.23, and 0.42 V and 0.130, 0.122, and 0.096 A/m 2, respectively. The SASC had the best electricity generation performance. Based on a limited reduction rate of oxygen at the cathode, the accumulation of cathode electrons was facilitated by the construction of multiple current paths in the MFC, which significantly increased the cathode electron transfer resistance and limited the electricity generation performance of the MFC. However, at the same time, the construction of multiple current paths promoted output of more electrons in the anode, reducing the retention of anode electrons and anode electron transfer resistance. The heavy metal removal efficiencies of SASC, DASC, and SADC were 2.68, 2.18, and 1.70 times that of the open circuit group, respectively. The migration of heavy metals in the soil depended mainly on the internal electric field intensity of the MFC rather than the total electricity generation. As the internal electric field intensity increased, the removal efficiency of heavy metals in the MFC increased.

Authors+Show Affiliations

School of Energy and Environment, Southeast University, Nanjing, 210096, China. Electronic address: zhangjingran1993@163.com.School of Energy and Environment, Southeast University, Nanjing, 210096, China. Electronic address: 2741709967@qq.com.School of Energy and Environment, Southeast University, Nanjing, 210096, China. Electronic address: 230179053@seu.edu.cn.School of Energy and Environment, Southeast University, Nanjing, 210096, China; Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Aoba Aramaki 6-6-06, Sendai, 980-8579, Japan. Electronic address: c_caoxian@163.com.School of Energy and Environment, Southeast University, Nanjing, 210096, China; School of Municipal Engineering, Xi'an University of Technology, Xi'an, 710048, China. Electronic address: wanghui306@xaut.edu.cn.School of Energy and Environment, Southeast University, Nanjing, 210096, China. Electronic address: lxnseu@163.com.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

33974843

Citation

Zhang, Jingran, et al. "Effects of Cathode/anode Electron Accumulation On Soil Microbial Fuel Cell Power Generation and Heavy Metal Removal." Environmental Research, vol. 198, 2021, p. 111217.
Zhang J, Sun Y, Zhang H, et al. Effects of cathode/anode electron accumulation on soil microbial fuel cell power generation and heavy metal removal. Environ Res. 2021;198:111217.
Zhang, J., Sun, Y., Zhang, H., Cao, X., Wang, H., & Li, X. (2021). Effects of cathode/anode electron accumulation on soil microbial fuel cell power generation and heavy metal removal. Environmental Research, 198, 111217. https://doi.org/10.1016/j.envres.2021.111217
Zhang J, et al. Effects of Cathode/anode Electron Accumulation On Soil Microbial Fuel Cell Power Generation and Heavy Metal Removal. Environ Res. 2021;198:111217. PubMed PMID: 33974843.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of cathode/anode electron accumulation on soil microbial fuel cell power generation and heavy metal removal. AU - Zhang,Jingran, AU - Sun,Yilun, AU - Zhang,Haochi, AU - Cao,Xian, AU - Wang,Hui, AU - Li,Xianning, Y1 - 2021/05/08/ PY - 2020/07/07/received PY - 2021/03/25/revised PY - 2021/04/22/accepted PY - 2021/5/12/pubmed PY - 2021/6/4/medline PY - 2021/5/11/entrez KW - Current path KW - Electricity generation KW - Electrode configuration KW - Electron transfer resistance KW - Metal SP - 111217 EP - 111217 JF - Environmental research JO - Environ Res VL - 198 N2 - Microbial fuel cells (MFCs) with different electrode configurations were constructed to study the mechanism of influence of multiple current paths on their electrical performance and the removal of heavy metals in soil. Three types of MFCs were constructed, namely, double anode-single cathode (DASC), single anode-dual cathode (SADC), and single anode-single cathode (SASC). The total electricity generation of the three kinds of MFC was similar: 143.44 × 10-3 mW, 114.90 × 10-3 mW, and 132.50 × 10-3 mW, respectively. However, the maximum voltage and cathode current density produced by a single current path differed significantly. The corresponding values were 0.27, 0.23, and 0.42 V and 0.130, 0.122, and 0.096 A/m 2, respectively. The SASC had the best electricity generation performance. Based on a limited reduction rate of oxygen at the cathode, the accumulation of cathode electrons was facilitated by the construction of multiple current paths in the MFC, which significantly increased the cathode electron transfer resistance and limited the electricity generation performance of the MFC. However, at the same time, the construction of multiple current paths promoted output of more electrons in the anode, reducing the retention of anode electrons and anode electron transfer resistance. The heavy metal removal efficiencies of SASC, DASC, and SADC were 2.68, 2.18, and 1.70 times that of the open circuit group, respectively. The migration of heavy metals in the soil depended mainly on the internal electric field intensity of the MFC rather than the total electricity generation. As the internal electric field intensity increased, the removal efficiency of heavy metals in the MFC increased. SN - 1096-0953 UR - https://www.unboundmedicine.com/medline/citation/33974843/Effects_of_cathode/anode_electron_accumulation_on_soil_microbial_fuel_cell_power_generation_and_heavy_metal_removal_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0013-9351(21)00511-9 DB - PRIME DP - Unbound Medicine ER -