Dynamics of two-metal codeposition inside a flow-through porous electrode at a high solution flow rate

Masliy, A.I.; Poddubny, N.P.; Медведев, А. С.; Belobaba, A. G.; Bokhonov, Boris B.

doi:10.1016/j.jelechem.2011.11.007

Cited by 5 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Increasing the bed expansion, the mass transfer would be favored due to the higher flow velocities, thus improving CE. On the other hand, the solid phase that composes the fluidized bed would have its conductivity reduced due to the lower shock probability between the particles, as previously discussed, bringing about a highly stepped overpotential profile and thus strong hydrogen gas evolution favored by the very negative overpotentials near the counter‐electrode;, meanwhile, a great portion of the region close to the current feeder would present low electrochemical activity and even regions with anodic dissolution of the electrodeposited metal , …”

Section: Resultsmentioning

confidence: 98%

Box–Behnken factorial design study of the variables affecting metal electrodeposition in membraneless fluidized bed electrodes

Tonini

Farinos

Prado

et al. 2012

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: Heavy metal removal from industrial wastewaters has been studied intensively since it is well known that they can cause severe problems to human health and aquatic life, even at very low concentrations. Traditional precipitation or adsorption technologies only transfer the problem to the solid phase, therefore new technologies, such as electrodeposition using fluidized bed electrodes (FBE), have been considered to avoid contamination. RESULTS: Copper electrodeposition from diluted solutions was carried out using a membraneless FBE. The supporting electrolyte concentration (Cs) was the main variable affecting the current efficiency (CE), energy consumption (EC), and space‐time yield (Y). Although it does not change the response surface morphology, increasing Cs there was an important improvement of CE, Y, and EC. The effects of current and bed expansion are much more complex, since an interaction effect between these two variables was verified. Considering only the region of active kinetic control, copper can be optimally recovered with CE > 90%, Y ∼93 kg h−1 m−3, and EC ∼3.2 kWh kg−1 by applying the highest levels of the independent variables. CONCLUSIONS: The results suggest that electrodeposition using a membraneless FBE is an excellent method for the treatment of effluents contaminated with copper or other metals. © 2012 Society of Chemical Industry

show abstract

Section: Resultsmentioning

confidence: 98%

Box–Behnken factorial design study of the variables affecting metal electrodeposition in membraneless fluidized bed electrodes

Tonini

Farinos

Prado

et al. 2012

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

“…It was shown that when the profiles of potential Е(х) and metal ion concentration с(х) inside PE change in one direction, which is typi cal of both this mode of delivery and an equipotential PE, the dependences of the final metal deposit mass m f on the volume solution flow rate m v represent non monotonic curves with flat maximums at relatively high m v (of the order of magnitude of 1-2 cm 3 /s) for both individual deposition and codeposition. In this case, the earlier observed [2] final gain in the deposit mass with the decrease in the circulating solution vol ume also holds but only for high flow rates, whereas the negative factor of the decrease in the mass of the cathodic codeposit [3] operates in the wide range of high and middle flow rates. Thus, for the case of solu tion frontal delivery and metal codeposition, only the region of high flow rates is optimal as regards the rate and the completeness of PE filling with the cathodic deposit.…”

Section: Introductionmentioning

confidence: 58%

The effect of the solution flow rate on the final mass of metals deposited into a porous electrode at individual and joint deposition. Rear delivery of solution

et al. 2014

View full text Add to dashboard Cite

Pursuing the studies of the effect of solution flow rate and direction on filling of a porous electrode with deposited metals, the peculiarities of individual and joint deposition of metals are studied for the rear solu tion delivery. In the rear delivery mode, the nonmonotonic dependence of the final mass of the cathodic deposit m f on the solution flow rate m v with the maximum at middle flow rates is observed to hold. The main differences from the frontal delivery mode are the much higher mass values in the maximum m f, max (1.5-3.5 fold higher) and the lower concomitant flow rates m v, max (0.05-1 cm 3 /s). Moreover, the highest mass gains and rate shifts correspond to the lower cathodic polarization values. These differences are associated with the opposite ori entation of the polarization and metal concentration profiles inside the PE, which is typical of the rear deliv ery, and also with the gradual shift of the PE critical section from the frontal to rear plane as the solution flow rate decreases. For the rear delivery, the m f, max value observed in the direct flow mode turns out to be even a little higher as compared with the circulation mode. This makes the direct flow mode of electrolysis in the middle range of flow rates the most efficient condition for the metal codeposition into a PE at the rear deliv ery. Experimental data on the individual and joint deposition of silver and copper on carbon felt VINN 250 from alkaline thiosulfate solutions at the rear delivery and different solution rates qualitatively agrees with the model calculations for a PE with the same specific surface.

show abstract

“…Taking into account the cathodic polarization curve (shown in [10]) measured in the alkaline thiosulfate solution studied, the chosen E L value substantially restricts the potential region of copper deposition. Hence, to com pare with experimental data, it is more reasonable to use calculations for E L = -0.5 V and approximately the same potential ranges of deposition of each com ponent.…”

Section: Codeposition Of Metalsmentioning

confidence: 99%

“…osition of metals in a flow through PE and their final parameters. Its description can be found in [7,8] for the deposition of a single metal inside PE and also in [9,10] 2 for codeposition of two metals. Due to the complicated character of the process of metal codeposition into a flow through PE, the following simplifications were used for solving this problem by simulations:…”

Section: Introductionmentioning

confidence: 99%

“…It is assumed that PE represents an aggregate of identical parallel cylindrical (in their initial state) fila ments with the length coinciding with the electrode thickness L; the Х axis origin is in the point of the rear 2 In publication [9], the equation for metal deposition rates con tains misprints, which were corrected later in [10]. current lead (Fig.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of the solution flow rate on the final mass of metals deposited into a porous electrode at individual and joint deposition. Frontal delivery of solution

et al. 2014

View full text Add to dashboard Cite

Calculations in terms of the model of metal codeposition into a porous electrode (PE) and exper imental measurements are used for studying how the flow rate m v and the volume of circulating solution at its frontal delivery affect the final mass of the cathodic deposit and its spatial distribution. For both individual and joint deposition of metals, the correlation between the final mass of the cathodic deposit m f and the uni formity of its distribution in PE is demonstrated: the more uniform the deposit distribution the higher its final mass. Due to peculiarities of the frontal delivery (the fixed position of the maximums of polarization and metal concentration and the same direction of their shift within the PE), the dependence of the final deposit mass on the volume flow rate demonstrates a very flat maximum shifted to sufficiently high m v . The increase in cathodic polarization and the transition to circulation with a small solution volume lead to the analogous shift. As a result, for the frontal delivery, the region of high flow rates turns out to be relatively more advanta geous for the metal deposition into PE. For codeposition of silver and copper from their alkaline thiosulfate solution at the frontal solution delivery, the qualitative agreement between experimental and calculated m f = f(m v ) dependences is demonstrated.

show abstract

Dynamics of two-metal codeposition inside a flow-through porous electrode at a high solution flow rate

Cited by 5 publications

References 12 publications

Box–Behnken factorial design study of the variables affecting metal electrodeposition in membraneless fluidized bed electrodes

Box–Behnken factorial design study of the variables affecting metal electrodeposition in membraneless fluidized bed electrodes

The effect of the solution flow rate on the final mass of metals deposited into a porous electrode at individual and joint deposition. Rear delivery of solution

The effect of the solution flow rate on the final mass of metals deposited into a porous electrode at individual and joint deposition. Frontal delivery of solution

Contact Info

Product

Resources

About