MASS TRANSPORT PROPERTIES OF A FLOW-THROUGH ELECTROLYTIC REACTOR USING A POROUS ELECTRODE: PERFORMANCE AND FIGURES OF MERIT FOR Pb(II) REMOVAL

Bertazzoli, Rodnei; Rodrigues, Christiane de Arruda; Dallan, Émerson José; Fukunaga, Mara Terumi; Lanza, Marcos R.V.; Leme, Renato Reis; Widner, R. C.

doi:10.1590/s0104-66321998000400008

Cited by 18 publications

(16 citation statements)

References 14 publications

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“…This value is in a good agreement with the literature since diffusion coefficients of metallic ions in diluted aqueous solutions present small differences, as can be seen in literature [19,20]. Bertazzoli et al [13] and Ragnini et al [7] reported the values of 2.0 Â 10 )5 cm 2 s )1 and 7.0 Â 10 )5 cm 2 s )1 , respectively, for Pb(II) in electrolytes similar to the one used in this work. The diffusion coefficient of Cu(II) in sulphate medium is 4.9 Â 10 )5 cm 2 s )1 [21] and the value of 4.0 Â 10 )5 cm 2 s )1 was reported for Co(II) in the same medium [22].…”

Section: Cyclic Voltammetrysupporting

confidence: 92%

“…As can be seen from these Levich plots, at this potential (and at more negative ones), the electrodeposition process is mass transfer controlled, a behaviour that is consistent with other literature [13].…”

Section: Cyclic Voltammetrysupporting

confidence: 91%

“…Assuming the value of the electrolyte kinematic viscosity as equal to 1.0 Â 10 )2 cm 2 s )1 [13], the Pb(II) diffusion coefficient was estimated to be 1.4 Â 10 )5 cm 2 s )1 . This value is in a good agreement with the literature since diffusion coefficients of metallic ions in diluted aqueous solutions present small differences, as can be seen in literature [19,20].…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

“…Ponce de Leon and Pletcher [12] investigated the removal of Pb(II) from different aqueous electrolytes at pH 2 using reticulated vitreous carbon (RVC) as a cathode and showed that the ion removal was always possible in perchlorate, nitrate, tetrafluoroborate and chloride media. Bertazzoli et al [13] reported that the use of RVC cathodes of 20, 45, 60 and 80 pores per inch, under a potentiostatic condition, led to a reduction of the Pb(II) concentration from 50 to 0.1 ppm, for recirculation times ranging from 20 to 120 min depending on the RVC porosity and the flow-rate.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Pb(II) from simulated wastewaters using a stainless-steel wool cathode in a flow-through cell

et al. 2006

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The investigation of an electrolytic process to remove Pb(II) from simulated wastewaters using a stainless-steel wool (SSW) cathode in a flow-through cell under potentiostatic condition is reported. Voltammetry under hydrodynamic conditions was used to estimate the diffusion coefficient, which was found to be 1.4 Â 10 )5 cm 2 s )1 in the supporting electrolyte (0.10 mol l )1 NaNO 3 and 0.10 mol l )1 H 3 BO 3 , pH 4.8). The performance of the flow-through cell was evaluated for three potentials: )0.70, )0.80 and )0.90 V vs. saturated calomel electrode (SCE). At )0.70 V, the reaction was found not to be completely controlled by mass transfer, while at )0.80 V and )0.90 V the Pb(II) concentration decayed exponentially. At )0.90 V, using a flow rate of 250 l h )1 , after a 90-min electrolysis, the Pb(II) concentration decayed from 50 ppm to only 1 ppm, corresponding to a 98% removal.

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Section: Cyclic Voltammetrysupporting

confidence: 92%

Section: Cyclic Voltammetrysupporting

confidence: 91%

Section: Cyclic Voltammetrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of Pb(II) from simulated wastewaters using a stainless-steel wool cathode in a flow-through cell

et al. 2006

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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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Towards Higher Energy Density Redox‐Flow Batteries: Imidazolium Ionic Liquid for Zn Electrochemistry in Flow Environment

et al. 2017

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We present the first demonstration of an ionic liquid electrolyte under a realistic flow environment for applications in redox-flow batteries based on the Zn 2 + /Zn 0 redox couple. An electrolyte mixture containing Zn(dca) 2 and 3 wt % H 2 O in 1-ethyl-3methylimidazolium dicyanamide, [Emim][dca], ionic liquid was used to study the effects of Zn 2 + concentration and flow rate on the Zn 2 + /Zn 0 electrochemical performance as well as its impact on the morphology of the Zn deposit. An optimized Zn 2 + concentration and flow rate were determined by using an in-house-designed 3D-printed flow-cell prototype. Surface characterization through SEM revealed that both the concentration and flow rate directly impact Zn morphology under flow conditions. The electrolyte mixture with a higher Zn(dca) 2 concentration (18 mol %) showed favourable results; voltammetry showed higher peak current densities (100 mA/cm 2 discharge current density) and more positive Zn electrodeposition potentials (À1.33 V vs Ag/AgOTf) coupled with higher cycling efficiency (45 AE 3%) compared to those obtained with the lower Zn concentration system (9 mol %, À1.44 V vs Ag/AgOTf, 48 mA/cm 2 discharge current density and 33 AE 3% cycling efficiency).

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MASS TRANSPORT PROPERTIES OF A FLOW-THROUGH ELECTROLYTIC REACTOR USING A POROUS ELECTRODE: PERFORMANCE AND FIGURES OF MERIT FOR Pb(II) REMOVAL

Cited by 18 publications

References 14 publications

Removal of Pb(II) from simulated wastewaters using a stainless-steel wool cathode in a flow-through cell

Removal of Pb(II) from simulated wastewaters using a stainless-steel wool cathode in a flow-through cell

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

Towards Higher Energy Density Redox‐Flow Batteries: Imidazolium Ionic Liquid for Zn Electrochemistry in Flow Environment

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