Faculty Opinions recommendation of Evidence for involvement of an electron shuttle in electricity generation by Geothrix fermentans.

2005 ◽  
Author(s):  
Dianne Newman
Keyword(s):  
Electricity Generation ◽  
Electron Shuttle ◽  
Geothrix Fermentans

scholarly journals Evidence for Involvement of an Electron Shuttle in Electricity Generation by Geothrix fermentans

2005 ◽  
Vol 71 (4) ◽  
pp. 2186-2189 ◽  
Author(s):  
Daniel R. Bond ◽  
Derek R. Lovley
Keyword(s):  
Organic Compounds ◽  
Electricity Generation ◽  
Graphite Electrode ◽  
Electricity Production ◽  
Electron Shuttle ◽  
Complete Oxidation ◽  
Electrical Characteristics ◽  
Graphite Electrodes ◽  
Oxidation Of Organic Compounds ◽  
Geothrix Fermentans

ABSTRACT In experiments performed using graphite electrodes poised by a potentiostat (+200 mV versus Ag/AgCl) or in a microbial fuel cell (with oxygen as the electron acceptor), the Fe(III)-reducing organism Geothrix fermentans conserved energy to support growth by coupling the complete oxidation of acetate to reduction of a graphite electrode. Other organic compounds, such as lactate, malate, propionate, and succinate as well as components of peptone and yeast extract, were utilized for electricity production. However, electrical characteristics and the results of shuttling assays indicated that unlike previously described electrode-reducing microorganisms, G. fermentans produced a compound that promoted electrode reduction. This is the first report of complete oxidation of organic compounds linked to electrode reduction by an isolate outside of the Proteobacteria.

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.

Feasible design for electricity generation from Chlorella vulgaris using convenient photosynthetic conditions

BIOCELL ◽  
2018 ◽  
Vol 42 (1) ◽  
pp. 7-11 ◽  
Author(s):  
M. Moustafa ◽  
T. Taha ◽  
M. Elnouby ◽  
M.A. Abu-Saied Aied ◽  
A. Shati ◽  
...  
Keyword(s):  
Chlorella Vulgaris ◽  
Electricity Generation

A Review on Utilization of Fly- Ash and Pond-Ash as a Partial Replacement of Cement in Concrete Mix Design

2018 ◽  
pp. 413-418
Author(s):  
Harshkumar Patel ◽  
Yogesh Patel
Keyword(s):  
Fly Ash ◽  
Electricity Generation ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Thermal Power ◽  
Strength Test ◽  
Partial Replacement ◽  
Pond Ash ◽  
Research Activities ◽  
Ash Disposal

Now-a-days energy planners are aiming to increase the use of renewable energy sources and nuclear to meet the electricity generation. But till now coal-based power plants are the major source of electricity generation. Disadvantages of coal-based thermal power plants is disposal problem of fly ash and pond ash. It was earlier considered as a total waste and environmental hazard thus its use was limited, but now its useful properties have been known as raw material for various application in construction field. Fly ash from the thermal plants is available in large quantities in fine and coarse form. Fine fly ash is used in construction industry in some amount and coarse fly ash is subsequently disposed over land in slurry forms. In India around 180 MT fly is produced and only around 45% of that is being utilized in different sectors. Balance fly ash is being disposed over land. It needs one acre of land for ash disposal to produce 1MW electricity from coal. Fly ash and pond ash utilization helps to reduce the consumption of natural resources. The fly ash became available in coal based thermal power station in the year 1930 in USA. For its gainful utilization, scientist started research activities and in the year 1937, R.E. Davis and his associates at university of California published research details on use of fly ash in cement concrete. This research had laid foundation for its specification, testing & usages. This study reports the potential use of pond-ash and fly-ash as cement in concrete mixes. In this present study of concrete produced using fly ash, pond ash and OPC 53 grade will be carried. An attempt will be made to investigate characteristics of OPC concrete with combined fly ash and pond ash mixed concrete for Compressive Strength test, Split Tensile Strength test, Flexural Strength test and Durability tests. This paper deals with the review of literature for fly-ash and pond-ash as partial replacement of cement in concrete.

PADDY RESIDUE AS FEEDSTOCK IN ELECTRICITY GENERATION: REDEMPTION OF LIFE CYCLE EMISSIONS AND COST ANALYSIS

2018 ◽  
Vol 13 (Number 1) ◽  
pp. 55-67
Author(s):  
Shafini M. Shafie ◽  
Zakirah Othman ◽  
N Hami
Keyword(s):  
Power Generation ◽  
Life Cycle ◽  
Cost Analysis ◽  
Positive Feedback ◽  
Energy Supply ◽  
Electricity Generation ◽  
Economic Sector ◽  
Ghg Emission ◽  
Coal Fuel ◽  
Biomass Resources

Malaysia has an abundance of biomass resources that can be utilised for power generation. One of them is paddy residue. Paddy residue creates ahuge potential in the power generation sector. The consumption of paddy residue can help Malaysia become less dependent on conventional sources of energy, mitigate greenhouse gas(GHG) emission, offer positive feedback in the economic sector, and at the same time, provide thebest solution for waste management activities. The forecast datafor 20 years on electricity generation wasused to calculate the GHG emission and its saving when paddy residue is used for electricity generation. The government’scost saving was also identified when paddy residue substituted coal fuel in electricity generation.This paper can provide forecast information so that Malaysia is able to move forward to apply paddy residue as feedstock in energy supply. Hopefully, the data achieved can encourage stakeholder bodies in the implementation of paddy residue inelectricity generation since there is apositive impact towardscost and emission saving.

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