The degradation of cyanide by anodic electrooxidation using different anode materials

Valiūnienė, Aušra; Baltrūnas, G.; Keršulytė, V.; Margarian, Žana; Valinčius, Gintaras

doi:10.1016/j.psep.2012.06.007

Cited by 23 publications

(20 citation statements)

References 21 publications

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“…That is, surface roughness increases proportionally to the active surface area. It was determined [17] that Ti electrodes covered with a thicker than 400 nm Pt layer are suitable for the electrochemical oxidation of cyanides. Therefore, aiming to analyze the content of the products formed in the cyanide solution during the process of electrochemical oxidation, the 1000 nm Pt-coated Ti electrode was chosen.…”

Section: Resultsmentioning

confidence: 99%

“…However we were unable to specify the other final product of the reaction, we would need to perform additional experiments and do quantum chemical calculations. Z" Ohm Z' Ohm From the voltammetric measurements it was determined [17] that electrochemical oxidation of cyanide occurs simultaneously with water electrolysis process, when electrode potential exceeds 1.1 V. Under lower voltage conditions, the Faraday process practically does not occur. In this study, the electrochemical impedance spectra of Ti and Pt covered Ti surfaces were recorded, at bias potentials 0.5 V, 0.7 V and 1.0 V. The electrochemical impedance spectra obtained using Ti electrode covered with 500 nm Pt layer are presented in Figure 4.…”

Section: -mentioning

confidence: 99%

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Electrochemical Oxidation of Cyanide Using Platinized Ti Electrodes

Valiūnienė

Antanavičius

Margarian

et al. 2013

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The cyanide-containing effluents are dangerous ecological hazards and must be treated before discharging into the environment. Anodic oxidation is one of the best ways to degrade cyanides. Pt anodes as the most efficient material for the cyanide electrochemical degradation are widely used. However, these electrodes are too expensive for industrial purposes. In this work Ti electrodes covered with nano-sized Pt particle layer were prepared and used for the anodic oxidation of cyanide ions. Surface images of Ti electrodes and Ti electrodes covered with different thickness layer of Pt were compared and characterized by the atomic force microscopy (AFM). The products formed in the solution during the CNions electrooxidation were examined by the Raman spectroscopy. An electrochemical Fast Fourier transformation (FFT) impedance spectroscopy was used to estimate the parameters that reflect real surface roughness of Pt-modified Ti electrodes.

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Section: Resultsmentioning

confidence: 99%

Section: -mentioning

confidence: 99%

Electrochemical Oxidation of Cyanide Using Platinized Ti Electrodes

Valiūnienė

Antanavičius

Margarian

et al. 2013

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“…The catalytic effect rises with the increasing Cu/Co ratio, until it levels off at Cu/Co  1, when the current efficiency for a cyanide-to-cyanate conversion exceeds 90 % (Table 1). This value of current efficiency is unrivaled in the literature dealing with electrochemical removal of cyanide at a variety of electrode materials (Table 1 [24][25][26][27][28][29][30]). The similarly high values reported by Hine et al [25] with PbO 2 anodes, however, were obtained by using much higher concentrated cyanide solutions (5000-26000 ppm), so they drastically decreased below 65 % with the decrease of the cyanide concentration below 2500 ppm.…”

Section: Electrolysis and Cyclic Voltammetry Of Alkaline Cyanide Solutionmentioning

confidence: 99%

Electro-oxidation of cyanide on active and non-active anodes: Designing the electrocatalytic response of cobalt spinels

Berenguer

Quijada

Rosa-Toro

et al. 2019

Separation and Purification Technology

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The feasibility of the electrochemical technologies for wastewater treatment greatly relies on the design of efficient but inexpensive electrocatalysts. It is generally accepted that the socalled "non-active" anodes (like the boron-doped diamond (BDD) or SnO 2 -based anodes), producing highly oxidizing hydroxyl radicals, are the most promising candidates for pollutants abatement. In this work, the electrocatalytic performance of various cobalt oxides, pure and doped with Cu or Au, for CN − oxidation has been studied and compared with that of conventional graphite, BDD, SnO 2 -Sb and SnO 2 -Sb-Pt. The metal oxide electrodes were prepared by thermal decomposition of the salt precursors onto Ti. For the M-doped Co 3 O 4 electrodes, the nominal M/Co ratios were Cu/Co = 0.07-1.00; and Au/Co = 0.05-0.20. The electrodes were characterized by different techniques (XRD, SEM, EDX, XPS) and their electrocatalytic response was studied by cyclic voltammetry and galvanostatic electrolysis in a H-type cell in aqueous 0.1 M NaOH. The obtained results show that the nature of the dopant plays a key role on the electrocatalytic behavior of cobalt spinels. Thus, while Cu catalyzes the CN − electro-oxidation, Au declines it. This is explained by the fact that, unlike Au (which segregates as Au-rich particles), Cu is effectively incorporated into the spinel structure by forming a solid solution (Cu x Co 3-x O 4 ). In this solid solution, atomic scale Cu (spinel) -CN − specific interactions occur to catalyze the reaction, whereas in segregated Au particles the oxidation is hindered probably by a too-strong adsorption of cyanide and/or its inaccessibility to oxide active sites. Electrolysis runs have revealed that "active" over-saturated Cu-doped spinels (Cu/Co = 1.00) exhibit higher current efficiencies than conventional graphite and "non-active" BDD and SnO 2 -based anodes. Hence, we hereby demonstrate that an inexpensive "active" electrocatalyst can show even higher efficiency than the most powerful BDD anode. These results highlight the significance of anode design in the application of the electrochemical technique for wastewater treatment.

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“…Iz tog razloga, potrebno je izvršiti pravilan izbor i pronaći optimalnu koncentraciju odgovarajućeg pomoćnog elektrolita za određeni polutant. Prema dostupnim izvorima, od istraživanja degradacije cijanida u prisustvu hlorida na elektrodama od čelika i nerđajućeg čelika, dostupno je samo istraživanje Valenijena (Valiuniene) i saradnika [28]. Autori su proučavali upotrebu hloridnih jona u cilju olakšavanja procesa degradacije cijanida.…”

Section: Borislav N Malinović 1 Miomir G Pavlović 2 unclassified

Effect of supporting electrolyte on electrolytic degradation of cyanide wastewater

Malinović¹,

Pavlović²,

Gorgi³

2014

Zas Mat

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EFFECT OF SUPPORTING ELECTROLYTE ON ELECTROLYTIC DEGRADATION OF CYANIDE WASTEWATER The paper describes the influence of chloride ions on the electrochemical oxidation of cyanide from wastewater. Chloride ions are added in the form of NaCl (c=0.017 mol/L), and electrochemical oxidation is carried out in a laboratory electrochemical reactor with electrodes made of steel and stainless steel (j=10 mA/cm 2 , t=90 min). In these conditions the removal efficiency of cyanide on steel electrodes was E u = 91.5%, and with electrodes made of stainless steel E u = 99.5%.

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The degradation of cyanide by anodic electrooxidation using different anode materials

Cited by 23 publications

References 21 publications

Electrochemical Oxidation of Cyanide Using Platinized Ti Electrodes

Electrochemical Oxidation of Cyanide Using Platinized Ti Electrodes

Electro-oxidation of cyanide on active and non-active anodes: Designing the electrocatalytic response of cobalt spinels

Effect of supporting electrolyte on electrolytic degradation of cyanide wastewater

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