Correlation between circuital current, Cu(II) reduction and cellular electron transfer in EAB isolated from Cu(II)-reduced biocathodes of microbial fuel cells

Shen, Jianjian; Huang, Liping; Zhou, Peng; Quan, Xie; Puma, Gianluca Li

doi:10.1016/j.bioelechem.2016.11.002

Cited by 66 publications

(25 citation statements)

References 49 publications

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“…One possible reason might be that the conductivity of the solutions is not high enough to enhance voltage signals . In addition, the XPS result shows the presence of characteristic peaks for Cu(0) at 932.4 eV , indicating that Cu 2+ acted as an electron acceptor and was deposited on cathode surface as Cu(0) (Figure ). Therefore, it can be deduced that the addition of CuSO 4 solutions reduced pH, increased ORP of overlaying water and provided electron acceptors, promoting cathodic reaction and thus stimulating voltage signals to rise up.…”

Section: Resultsmentioning

confidence: 99%

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A Novel Sediment Microbial Fuel Cell Based Sensor for On‐Line and in situ Monitoring Copper Shock in Water

Deng

Han

et al. 2018

Electroanalysis

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To online and in situ monitor the heavy metal shock in water, a novel sediment microbial fuel cell based sensor was developed with anode being inserted into flooded soil and cathode submerged in overlaying water. Immediately after CuSO4 solutions were added into the overlaying water, the voltage signal generated by the sensor reached a peak and the increment from baseline voltage to peak voltage increased linearly with Cu2+ concentrations up to 160 mg L−1. After Cu2+ shock, charge transfer resistance (Rct) of anode and cathode was determined by using electrochemical impedance spectroscopy. Soil DNA and RNA was extracted and 16S rRNA and 16S rRNA gene of dominant exoelectrogenic bacteria (Geobacter and Clostridium) was quantified. Result showed that Cu2+ shock decreased cathodic charge transfer resistance (Rct) but did not affect anodic Rct. The addition of 320 mg L−1 Cu2+ significantly reduced abundance and activity of Geobacter and Clostridium in surface soil (0–3 cm in depth) but had no effect on exoelectrogenic bacteria in deeper soil. Moreover, baseline voltage was stable after Cu2+ shock. The result indicates that the sensor could online and in situ monitor Cu2+ shock which increased voltage signal by promoting cathodic reaction without dramatically inhibiting exoelectrogenic bacteria.

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Section: Resultsmentioning

confidence: 99%

“…The analyzed area of the cathode sample was approximately 0.25 cm 2 . An overview spectrum (0–1000 eV) and a narrow region corresponding to Cu 2p (925–970 eV) were recorded . The main Cu 2p peaks was fitted using XPS peak software.…”

Section: Methodsmentioning

confidence: 99%

A Novel Sediment Microbial Fuel Cell Based Sensor for On‐Line and in situ Monitoring Copper Shock in Water

Deng

Han

et al. 2018

Electroanalysis

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“…As an alternative, copper (Cu 2+ ) can be used as a dcESM due to its excellent catalytic behavior. Cu 2+ improves the biocathode performance in MFC by promoting the electron transfer between cathode and microbes [27][28][29]. Recently, Li and Zhou [25] acts as the electron donor for the reduction of Cr 6+ to Cr 3+ , while at the same time, the Cu 1+ is oxidized back to Cu 2+ (Eqs.…”

Section: Introductionmentioning

confidence: 99%

The performance of Cu2+ as dissolved cathodic electron-shuttle mediator for Cr6+ reduction in the microbial fuel cell

Gangadharan

Nambi

2020

Preprint

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The study investigates the performance of Cu2+ as dissolved cathodic electron-shuttle mediator (dcESM) for simultaneous Cr6+ reduction and electricity generation in a microbial fuel cell (MFC) at pH 2 and 4 conditions. The dcESM behavior of Cu2+ on carbon cloth (CC) catalyzes the reduction of Cr6+ into Cr3+ at pH 2 by undergoing redox reactions. However, at pH 4, a simultaneous reduction of Cu2+ and Cr6+ was observed. Cyclic voltammetry studies were performed at pH 2 and 4 to probe the dcESM behavior of Cu2+ for Cr6+ reduction on CC electrode. Also, at pH 2, increasing the concentration of Cu2+ from 50 to 500 mg L-1 favors the Cr6+ reduction by reducing the reaction time from 108 to 48 h and improving the current production from 3.9 to 6.2 mA m-2, respectively. Nevertheless, at pH 4, the efficacy of Cr6+ reduction and electricity generation from MFC is decreased from 63 to 18% and 4.4 to 1.1 mA m-2, respectively, by increasing the Cu2+ concentration from 50 to 500 mg L-1. Furthermore, the performance of dcESM behavior of Cu2+ was explored on carbon felt (CF) and platinum (Pt) electrodes, and compare the results with CC. In MFC, at pH 2, with an initial concentration of 100 mg L-1, the reduction of Cr6+ in 60 h is 9.6 mg L-1 for CC, 0.2 mg L-1 for CF, and 51.3 mg L-1 for Pt cathodes. The reduction of Cr6+ (initial concentration of 100 mg L-1) at pH 4 in 120 h is 44.7 mg L-1 for CC, 32.1 mg L-1 for CF, and 70.9 mg L-1 for Pt cathodes. Maximum power densities of 1659, 1509, and 1284 mW m-2 were achieved when CF, CC, and Pt, respectively were employed as cathodes in the MFC.

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“…So, to avoid that, biocathodes can be used as an alternative to abiotic cathodes [10][11][12][13][14]. Another advantage of using different biocathodes is that the active microbial metabolism can be used to produce beneficial products [15] or eliminate nutrients from wastewaters, such as nitrate and contaminants such as heavy metals [16,17]. Different microbial populations can be used as biocatalysts in biocathodes such as nitrifying and denitrifying bacteria or microalgae to produce electron acceptors required for reduction reaction at the cathode [18,19].…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic Microbial Desalination Cell to Treat Oily Wastewater Using Microalgae Chlorella Vulgaris

2019

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Microbial desalination cell (MDC) offers a new and sustainable approach to desalinate saltwater by directly utilizing the electrical power generated by bacteria during organic matter oxidation. In this study, we used microalgae Chlorella Vulgaris in the cathode chamber to produce oxygen as an electron accepter by photosynthesis process for generate bioelectricity power and treat oil refinery wastewater by microorganisms in both anode and cathode.The power density generated by this Photosynthetic Microbial Desalination Cell (PMDC) with 1KΩ external resistance at the first 4th hr. of operation period was 0.678 W/m3 of anode volume and 0.63 W/m3 of cathode volume. It increased after one day to a peak value of (4.32 W/m3 of anode volume and 4.013 W/m3 of cathode volume). The microalgae growth in the biocathode chamber followed in terms of optical density. The optical density increased from 0.546 at the beginning of the system operation to 1.71 after 24 days of operation period. The percentage removal of chemical oxygen demand (COD) of oil refinery wastewater was 97.33% and 79.22% in anode and cathode chamber, respectively. The microalgae in the biocathode were able to remove volatile compounds causing odor from the influent wastewater. TDS removal rate 159.722 ppm/h with initial TDS in desalination chamber of 35000 ppm.

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Correlation between circuital current, Cu(II) reduction and cellular electron transfer in EAB isolated from Cu(II)-reduced biocathodes of microbial fuel cells

Cited by 66 publications

References 49 publications

A Novel Sediment Microbial Fuel Cell Based Sensor for On‐Line and in situ Monitoring Copper Shock in Water

A Novel Sediment Microbial Fuel Cell Based Sensor for On‐Line and in situ Monitoring Copper Shock in Water

The performance of Cu2+ as dissolved cathodic electron-shuttle mediator for Cr6+ reduction in the microbial fuel cell

Photosynthetic Microbial Desalination Cell to Treat Oily Wastewater Using Microalgae Chlorella Vulgaris

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