Mass transfer to percolated porous materials in a small-scale cell operating by self-pumping

Langlois, Simon; Nanzer, J.; Cœuret, F.

doi:10.1007/bf01320649

Cited by 14 publications

(3 citation statements)

References 12 publications

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“…The literature on metal ion removal from aqueous electrolytes using three dimensional electrode cells is extensive [4][5][6][7][8][9][10][11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Electrolytic removal of metals using a flow-through cell with a reticulated vitreous carbon cathode

Bertazzoli¹,

Widner²,

Lanza³

et al. 1997

J. Braz. Chem. Soc.

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O objetivo do presente trabalho foi estabelecer um processo eletrolítico para remover metais de efluentes aquosos usando um catodo tridimensional de carbono vítreo reticulado. Durante o desenvolvimento do trabalho foi estudado a influência do fluxo do eletrólito e da porosidade do eletrodo. A célula eletrolítica utilizou potenciais tais que a reação de redução ocorreu sob controle de transporte de massa. A célula demonstrou eficiência na remoção de chumbo, zinco e cobre, reduzindo a concentração desses metais de 50 mg.L -1 a 0,1 mg.L -1 em 20 min de recirculação da solução.The aim of the present study was to establish an electrolytic method for the removal of metals from wastewater using a three dimensional, reticulated vitreous carbon cathode. During the development of the experimental set up, particular attention was paid to the electrolyte flow rate and to the cathode porosity. The electrolytic cell employed potential values in such a way that the metals reduction reaction occurred under mass transport control. These potentials were determined by hydrodynamic voltammetry on a vitreous carbon rotating disc electrode. The cell proved to be efficient in removing copper, zinc and lead and it was able to reduce the levels of these metals from 50 mg/L to 0.1 mg/L.

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“…The literature on metal ion removal from aqueous electrolytes using three dimensional electrode cells is extensive [4][5][6][7][8][9][10][11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Electrolytic removal of metals using a flow-through cell with a reticulated vitreous carbon cathode

Bertazzoli¹,

Widner²,

Lanza³

et al. 1997

J. Braz. Chem. Soc.

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“…Laboratory-scale undivided cells have been used for studying mass transfer effects on porous electrodes [1][2] while other reactors have been employed for the destruction of pollutants from industrial wastewaters [3][4][5][6][7], such as textile effluents [7]. In addition, an undivided reactor has been used for a flowing soluble lead battery application [8].…”

Section: Introductionmentioning

confidence: 99%

“…Membrane-free electrochemical reactors have been studied extensively [1][2][3][4][5][6][7][8]. Laboratory-scale undivided cells have been used for studying mass transfer effects on porous electrodes [1][2] while other reactors have been employed for the destruction of pollutants from industrial wastewaters [3][4][5][6][7], such as textile effluents [7].…”

Section: Introductionmentioning

confidence: 99%

A membrane free electrochemical cell using porous flow-through graphite felt electrodes

2008

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This work describes the development and characterisation of an electrochemical cell which can be used to give high reactant conversion without the need for a membrane. The undivided cell uses two high porosity flowthrough graphite felt electrodes, with the products flowing through the back of each electrode. A series of tests have been conducted using an equimolar mixture of potassium hexacyanoferrate (II) and potassium hexacyanoferrate (III) to characterise the cell design and identify suitable operating conditions. It has been shown that high reactant conversion (in excess of 90%) can be achieved for high concentrations of redox species at low flow rates (superficial velocities of around 0.1 mm s -1 ). However, the cell voltage required to achieve high conversions increased with increasing concentration. Keywords Undivided cell Á Flow-through electrodes Á Redox species Á Potassium hexacyanoferrate (II) Á Potassium hexacyanoferrate (III) Nomenclature a Specific surface area (m 2 m -3 ) C 0 Feed concentration (mol dm -3 ) C 0 Outlet concentration (mol dm -3 ) E cell Cell potential (V) F Faraday constant (96,487 C mol -1 ) I Cell current (A) k m Mass transport coefficient (m s -1 ) L Porous electrode thickness (m) L a Active electrode thickness (m) n Number of electrons transferred per mole of reactants Q Volumetric flow rate of electrolyte (cm 3 s -1 ) Re Reynolds number u Mean flow velocity (m s -1 ) V Total volume of electrolyte reacted (m 3 ) W.E Working electrode X Reactant conversionGreek symbols a = k m a/u (m -1 ) / Current efficiency j Electrolyte conductivity (S m -1 )

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Reply to Nanzer and Coeuret

Fabre

1997

Can J Chem Eng

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Mass transfer to percolated porous materials in a small-scale cell operating by self-pumping

Cited by 14 publications

References 12 publications

Electrolytic removal of metals using a flow-through cell with a reticulated vitreous carbon cathode

Electrolytic removal of metals using a flow-through cell with a reticulated vitreous carbon cathode

A membrane free electrochemical cell using porous flow-through graphite felt electrodes

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