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Jha, K.; Weidner, John W.

doi:10.1023/a:1003753220647

Cited by 19 publications

(13 citation statements)

References 7 publications

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“…Usually a difference is made between ''high-level'' (i.e. with high radioactivity) and ''low-level'' (low radioactivity) wastes; 68,69,71,[176][177][178] typically, the latter are highly alkaline and contain high (ca. 1 M) concentrations of NO 2 À and NO 3 À along with SO 4 2À , halides, [Al(OH) 4 ] À , Cr(VI) (at a millimolar level) and traces of Ru(III) and Hg(II).…”

Section: Nuclear Wastesmentioning

confidence: 99%

Powering denitrification: the perspectives of electrocatalytic nitrate reduction

Duca

Koper

2012

Energy Environ. Sci.

539

439

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Section: Nuclear Wastesmentioning

confidence: 99%

Powering denitrification: the perspectives of electrocatalytic nitrate reduction

Duca

Koper

2012

Energy Environ. Sci.

539

439

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“…Transition metals demonstrated interesting electrocatalytic properties for the reduction of nitrate and nitrite but ammonia formation seems to be predominant [10,11,[15][16][17][18][19][20][21][22][23][24][25][26][27]. The highest catalytic activity was found for Cu, Rh and Pt electrodes.…”

Section: Introductionmentioning

confidence: 99%

Cu–Ni materials prepared by mechanical milling: Their properties and electrocatalytic activity towards nitrate reduction in alkaline medium

Durivault

Brylev

Reyter

et al. 2007

Journal of Alloys and Compounds

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“…Journal of The Electrochemical Society, 160 (1) G19-G26 (2013) Equation (15) can be rewritten in terms of circuit elements as shown below: [16] where R e = 1 4κro is electrolyte resistance, [17] and the charge-transfer resistance R t = RT αFiss . Zsim software was used to fit this model to impedance data.…”

Section: Resultsmentioning

confidence: 99%

“…17,18 In water treatment applications the common goal is to convert nitrates and nitrites to N 2 as shown in reactions 2 and 3 below…”

mentioning

confidence: 99%

Electrochemical Reduction of Nitrite to Ammonia for Use in a Bioreactor

Şahin

Lin

Khunjar

et al. 2012

J. Electrochem. Soc.

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One novel means of biofuel production requires the reduction of nitrite ions to produce ammonia (which serves as an electron source for genetically-modified, carbon dioxide-fixing bacteria). The feasibility of this process depends on the performance of both the electrochemical reactor and a coupled bioreactor. We report on characterization of the electrochemical process involving nitrite reduction to ammonia in buffered electrolytes in the pH range between 6.0 and 8.0. A limiting current plateau was observed and determined to be due to flux of phosphate buffer (the primary source of protons) to the electrode surface. Importantly to the development of a sustainable process, current efficiencies of nitrite reduction to ammonia of 100% on both nickel and glassy carbon electrodes are possible. A divided flow-by porous electrode cell was designed as a proof of principle by coupling it to the bioreactor. It was observed that the overpotential of glassy carbon cathode decreased by ∼500 mV over 10 days which would correspond to 24% decrease in power requirements for the electrochemical reactor.As global energy consumption increases, efficient biofuel production from renewable energy resources may be increasingly important. Current methods frequently rely on natural photosynthesis, but these photosynthetic approaches suffer from low energy conversion efficiencies. The maximum theoretical biomass production efficiency from photosynthesis is 11.9%, and in real systems is closer to one percent. 1 Additionally, the conversion of biomass to biofuels that are compatible with the transportation-fuels infrastructure presents a challenge. New approaches with improved energy to biomass/biofuel conversion efficiency are presently being considered. Figure 1 illustrates one approach in which electrical energy is used indirectly to reduce carbon dioxide into a target fuel or chemical. Such a system, which is essentially a microbial fuel cell running in reverse, has the potential to direct renewable energy into high energy organic compounds. One manifestation of this approach was demonstrated by Li et al. using the lithoautotrophic organism Ralstonia eutrophia. 2 A bioreactor containing this organism is coupled to an electrochemical reactor that can reduce CO 2 to CHOO − . The organism takes in CHOO − from the electrochemical reactor and it is genetically engineered to produce isobutanol and 3-methyl-1-butanol. In our approach, we avoid the necessity of electrochemical reduction of CO 2 and instead rely on the biological reduction of CO 2 using a chemolithoautotrophic organism.Using electrical energy to drive bacteria to produce chemicals has been explored in microbial electrolysis cells in which cells have direct contact with an electrode. 3-5 The system proposed here features an electrochemical reactor (for energy capture) and a bioreactor (for bioproduction) that are spatially and temporally decoupled. This decoupling allows for independent optimization of both processes.

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Untitled

Cited by 19 publications

References 7 publications

Powering denitrification: the perspectives of electrocatalytic nitrate reduction

Powering denitrification: the perspectives of electrocatalytic nitrate reduction

Cu–Ni materials prepared by mechanical milling: Their properties and electrocatalytic activity towards nitrate reduction in alkaline medium

Electrochemical Reduction of Nitrite to Ammonia for Use in a Bioreactor

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