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

2020 ◽  
Author(s):  
Praveena Gangadharan ◽  
Indumathi M Nambi
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Electricity Generation ◽  
Carbon Cloth ◽  
Electron Shuttle ◽  
Simultaneous Reduction ◽  
Initial Concentration ◽  
Pt Electrodes ◽  
Current Production ◽  
Power Densities

Abstract 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.

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

2020 ◽  
Author(s):  
Praveena Gangadharan ◽  
Indumathi M Nambi
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Electricity Generation ◽  
Carbon Cloth ◽  
Electron Shuttle ◽  
Simultaneous Reduction ◽  
Initial Concentration ◽  
Pt Electrodes ◽  
Current Production ◽  
Power Densities

Abstract 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 (CV) 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 mg L− 1 to 500 mg L− 1 favors the Cr6+ reduction by reducing the reaction time from 108 h to 48 h and improving the current production from 3.94 mA m− 2 to 6.24 mA m− 2, respectively. Nevertheless, at pH 4, the efficacy of Cr6+ reduction and electricity generation from MFC is decreased from 62.91–18.21% and 4.42 mA m− 2 to 1.10 mA m− 2, respectively, by increasing the Cu2+ concentration from 50 mg L− 1 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 9.63 mg L− 1 for CC, 0.17 mg L− 1 for CF, and 51.32 mg L− 1 for Pt cathodes. The reduction of Cr6+ (initial concentration of 100 mg L− 1) at pH 4 in 120 h is 44.72 mg L− 1 for CC, 32.13 mg L− 1 for CF, and 70.85 mg L− 1 for Pt cathodes. Maximum power densities of 1659 mW m− 2, 1509 mW/m− 2, and 1284 mW/m− 2 were achieved when CF, CC, and Pt, respectively were employed as cathodes in the MFC.

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

2020 ◽  
Vol 30 (1) ◽  
Author(s):  
Praveena Gangadharan ◽  
Indumathi M. Nambi
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Electricity Generation ◽  
Carbon Cloth ◽  
Electron Shuttle ◽  
Simultaneous Reduction ◽  
Initial Concentration ◽  
Pt Electrodes ◽  
Current Production ◽  
Power Densities

Abstract 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.

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

2020 ◽  
Author(s):  
Praveena Gangadharan ◽  
Indumathi M Nambi
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Electricity Generation ◽  
Carbon Cloth ◽  
Electron Shuttle ◽  
Simultaneous Reduction ◽  
Initial Concentration ◽  
Pt Electrodes ◽  
Current Production ◽  
Power Densities

Abstract The study investigates the performance of Cu 2+ as dissolved cathodic electron-shuttle mediator (dcESM) for simultaneous Cr 6+ reduction and electricity generation in a microbial fuel cell (MFC) at pH 2 and 4 conditions. The dcESM behavior of Cu 2+ on carbon cloth (CC) catalyzes the reduction of Cr 6+ into Cr 3+ at pH 2 by undergoing redox reactions. However, at pH 4, a simultaneous reduction of Cu 2+ and Cr 6+ was observed. Cyclic voltammetry (CV) studies were performed at pH 2 and 4 to probe the dcESM behavior of Cu 2+ for Cr 6+ reduction on CC electrode. Also, at pH 2, increasing the concentration of Cu 2+ from 50 mg L -1 to 500 mg L -1 favors the Cr 6+ reduction by reducing the reaction time from 108 h to 48 h and improving the current production from 3.94 mA m -2 to 6.24 mA m -2 , respectively. Nevertheless, at pH 4, the efficacy of Cr 6+ reduction and electricity generation from MFC is decreased from 62.91% to 18.21% and 4.42 mA m -2 to 1.10 mA m -2 , respectively, by increasing the Cu 2+ concentration from 50 mg L -1 to 500 mg L -1 . Furthermore, the performance of dcESM behavior of Cu 2+ 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 Cr 6+ in 60 h is 9.63 mg L -1 for CC, 0.17 mg L -1 for CF, and 51.32 mg L -1 for Pt cathodes. The reduction of Cr 6+ (initial concentration of 100 mg L -1 ) at pH 4 in 120 h is 44.72 mg L -1 for CC, 32.13 mg L -1 for CF, and 70.85 mg L -1 for Pt cathodes. Maximum power densities of 1659 mW m -2 , 1509 mW/m -2 , and 1284 mW/m -2 were achieved when CF, CC, and Pt, respectively were employed as cathodes in the MFC.

scholarly journals Wood carbon electrode in microbial fuel cell enhances chromium reduction and bioelectricity generation

2021 ◽  
Author(s):  
Hongyuhang Ni ◽  
Aman Khan ◽  
Zi Yang ◽  
Yuxin Gong ◽  
Gohar Ali ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Electricity Generation ◽  
Three Dimensional ◽  
Good Choice ◽  
Carbon Cloth ◽  
Carbon Electrode ◽  
Carbon Felt ◽  
Bioelectricity Generation ◽  
Wide Scale

Abstract Microbial Fuel Cell (MFC) remediate hexavalent chromium (Cr(VI)) in wastewater, but inefficient removal for wide scale. In this study, a wood carbon (WC) electrode was introduce in MFC to analyzed the Cr(VI) remediation mechanism and effect of WC on it. The results show that the Cr(VI) was completely removed with WC electrode as compare to the carbon cloth (31.12 ± 0.31%) and carbon felt (34.83% ± 0.12) within 48 hours. The maximum power density of the WC electrode was 62.59 ± 0.27 mW m− 2. Here in, WC might a good choice with a three-dimensional porous structure for Cr(VI) contaminated wastewater treatment and electricity generation in MFC.

scholarly journals The Energy Production and Efficiency Treatment of ML-MFC Using High Organic Content Wastewater

2020 ◽  
Vol 202 ◽  
pp. 10006
Author(s):  
Aris Mukimin
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Flow Rate ◽  
Gas Diffusion ◽  
Organic Content ◽  
Carbon Cloth ◽  
Complex Character ◽  
Before And After ◽  
Current Production ◽  
High Organic Content

Microbial fuel cell (MFC) is a technology that is not only able to produce energy but also treats wastewater. The membraneless microbial fuel cell (ML-MFC) system was developed to avoid the use of membranes that are prone to clogging and are less applicable. The reactor was made and arranged in two chambers connected by pipes and the fluid flow rate is set using a peristaltic pump. Three anodes (carbon cloth) were paired with a carbon-Pt cathode GDL (Gas Diffusion Layer) type. The reactor was applied to wastewater taken from the industrial WWTP unit at the point before and after UASB. ML-MFC reactors can produce currents of 0.2 mA (before UASB) and 0.25 mA (after UASB). Current production is strongly influenced by the flow rate and characteristics of wastewater. Increased flow rates and complex character of wastewater will reduce current production. The electric power produced is 0.035 mwatt for wastewater before UASB and 0.086 mwatt after UASB with a COD removal is close to the same, which is 21% at a flow rate of 11 L / min1

scholarly journals Anode Maturation Time for Attaining a Mature Anode Biofilm and Stable Cell Performance in a Single Chamber Microbial Fuel Cell with a Brush Anode

2020 ◽  
Author(s):  
Huong V. H. Tran ◽  
Eojin Kim ◽  
Bonyoung Koo ◽  
Sunghoon Sung ◽  
Sokhee P. Jung
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Maximum Power ◽  
Cell Performance ◽  
The Other ◽  
Maturation Time ◽  
Single Chamber ◽  
Current Production ◽  
Power Densities ◽  
Over Time

To obtain an accurate and reproducible experimental results in microbial fuel cell (MFC), it is important to know ‘anode maturation biofilm’ to produce a stable and maximum performance. For this purpose, four single chamber MFCs were tested in this study. The linear sweep voltammetry (LSV) polarization tests illustrated that maximum power densities of three MFCs became stable after 9 weeks. Although there were variations afterwards, such variations were negligible. Average maximum power densities from the 9th to the 17th week were 2,990 mW/m2 (MFC-4), 2,983 mW/m2 (MFC-2), 2,368 mW/m2 (MFC-3) and 837 mW/m2 (MFC-1). Polarization resistance shows that MFC-1 had much larger anode resistance (36.6-85.4 Ω) than the other MFCs (1.7-11.6 Ω). Anodic cyclic voltammetry (CV) shows that current production increased over time and MFC-1 had much smaller current production (24.4 mA) than the other MFCs (31.0-34.9 mA) at 17th week. The increased current production indicates anode biofilm became more mature over time, but overall cell performance did not increased accordingly. Possibly due to the bad inoculation, MFC-1 showed the lowest performance. However, its performance was restored to the initial performance and anode resistance was reduced by 47% at 17th week. This study shows that the optimum anode maturation time is 9 weeks and that bioanode performance is a key factor for MFC performance. This study also shows than LSV polarization and CV tests are accurate and non-destructive measurement methods for diagnosing anode performance.

scholarly journals Biotreatment of Actual Potato Chips Processing Wastewater with Electricity Generation in Microbial Fuel Cell

2018 ◽  
Vol 24 (12) ◽  
pp. 26-34
Author(s):  
Ahmed Yasir Radeef ◽  
Zainab Ziad Ismail
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Electricity Generation ◽  
Suspended Solids ◽  
Potato Chips ◽  
Anaerobic Sludge ◽  
External Resistance ◽  
Power Densities

This study aimed to investigate the feasibility of treatment actual potato chips processing wastewater in a continuously operated dual chambers microbial fuel cell (MFC) inoculated with anaerobic sludge. The results demonstrated significant removal of COD and suspended solids of more than 99% associated with relatively high generation of current and power densities of 612.5 mW/m3 and 1750 mA/m3, respectively at 100 Ω external resistance.  

scholarly journals The Energy Production and Efficiency Treatment of ML-MFC Using High Organic Content Wastewater

2020 ◽  
Vol 202 ◽  
pp. 10005
Author(s):  
Aris Mukimin
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Flow Rate ◽  
Gas Diffusion ◽  
Organic Content ◽  
Carbon Cloth ◽  
Complex Character ◽  
Before And After ◽  
Current Production ◽  
High Organic Content

Microbial fuel cell (MFC) is a technology that is not only able to produce energy but also treats wastewater. The membraneless microbial fuel cell (ML-MFC) system was developed to avoid the use of membranes that are prone to clogging and are less applicable. The reactor was made and arranged in two chambers connected by pipes and the fluid flow rate is set using a peristaltic pump. Three anodes (carbon cloth) were paired with a carbon-Pt cathode GDL (Gas Diffusion Layer) type. The reactor was applied to wastewater taken from the industrial WWTP unit at the point before and after UASB. ML-MFC reactors can produce currents of 0.2 mA (before UASB) and 0.25 mA (after UASB). Current production is strongly influenced by the flow rate and characteristics of wastewater. Increased flow rates and complex character of wastewater will reduce current production. The electric power produced is 0.035 mwatt for wastewater before UASB and 0.086 mwatt after UASB with a COD removal is close to the same, which is 21% at a flow rate of 11 L / min1

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