Application of volumetric electrodes to the recovery of silver in sulphuric acid solutions. I. Mass transfer and electrochemical rate

Ratel, A.; Lacoste, G.

doi:10.1007/bf00615091

Cited by 5 publications

(1 citation statement)

References 13 publications

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“…This electrochemical reactor provides large surface area usually depleting the concentration of metal ions below 0.1 ppm. Several forms of flow-through porous electrodes have been employed for the removal of heavy metals, such as graphite felt (GF) [12], carbon particles [5], zinc spheres [9], silver coated glass [13], platinum screen [14], reticulated vitreous carbon (RVC) [8,15], stainless-steel fibers [16], nickel felts and nickel foams [17], to mention some of them. Experimental mass transport correlations obtained in this kind of flow-through reactors, when electrodes usually work under mass transport control, evidenced disagreement between authors.…”

Section: Introductionmentioning

confidence: 99%

Mass Transport and Potential Studies in a Flow-through Porous Electrode Reactor

Nava¹,

Recéndiz²,

González³

et al. 2009

Port. Electrochim. Acta

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This paper deals with the use of reticulated vitreous carbon (RVC) and graphite felt (GF) as porous electrode for the removal of 20 ppm Cu(II) in 0.5 mol dm -3 Na 2 SO 4 at pH 2 (which resembles a rinsing wastewater generated by a plating industry). The experimental mass transport characterization (k m a = bu c ) showed that for 100 ppi (RVC), the value of the coefficient b, associated with magnitude of porous electrode, is 0.88, while for (GF) is 3.38. On the other hand, c value for 100 ppi (RVC) is 0.06, while for (GF) is 0.62, indicating that the flow pattern is a complex function of the shape of the electrode. The experimental potential drop for 100 ppi (RVC) and (GF) (1.2 cm thick), indicated the absence of hydrogen evolution. Current efficiencies for RVC and GF were function of convection, giving values comprised between 45 ≤ φ ≤ 68% and 51 ≤ φ ≤ 73%, respectively, and energy consumption values of 0.3 < E cons < 1.7 and 0.4 < E c < 1.1 kWh m -3 , respectively. Theoretical number of identical cells in the stack (N) necessary to the cupric depletion from 20 to 1 ppm, for 100 ppi (RVC) and (GF) were calculated.

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