Electrocatalytic Oxidation of As(III): I . Voltammetric Studies at Pt Electrodes in

Cabelka, Tim D.; Austin, Deborah S.; Johnson, Dennis C.

doi:10.1149/1.2115916

Cited by 59 publications

(58 citation statements)

References 23 publications

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“…Electrochemical deposition should be a promising and convenient method to remove the arsenic from aqueous solution and realize the recycling usage of leaching solution. A lot of efforts [2][3][4][5][6][7][8] have been done to investigate the electrochemical behavior of arsenic in aqueous solution, as well as the deposition rate and current efficiency of elementary As. It has been found that toxic gas arsine will be produced as by-product during the electrodeposition of elementary arsenic [9,10], which has become a very important issue for the study of arsenic deposition.…”

Section: Introductionmentioning

confidence: 99%

A study on the evolution of arsine during arsenic electrodeposition: The influence of ammonium citrate

Shan

Ruan

2012

Electrochemistry Communications

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Section: Introductionmentioning

confidence: 99%

A study on the evolution of arsine during arsenic electrodeposition: The influence of ammonium citrate

Shan

Ruan

2012

Electrochemistry Communications

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“…The curves indicate that there is direct proportionality between I −1 and ω −1/2 , and the intercept on I axes is not zero. A result can be drawn that a mixed control (ion transport and kinetics) was present in the reaction taking place at 0.84 V. 34,37 A curve has been drawn through the points obtained and the goodness of fit of each line is shown in Figure 4. Diffusion coefficient D has been calculated from the value of the slope using Eq.…”

Section: Resultsmentioning

confidence: 99%

An RDE Investigation of NaOH Effect on Electrosynthesis of Lead Dioxide in Alkaline Solution

Ren-ping

Han

et al. 2016

J. Electrochem. Soc.

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An electrochemical investigation of NaOH concentration on electrosynthesis of lead dioxide in alkaline solutions was performed using rotating disk electrodes (RDE). The results show that Pb(II) does not modify the evolution of oxygen in alkaline solutions, and the reaction taking place at 0.84 V SHE is under the mixed control of ionic transport and charge transfer. The Koutechy-Levich equation was used to calculate the value of diffusion coefficient D and apparent heterogeneous rate constant k of the PbO 2 electrodeposition process at 0.84 V SHE . The results indicate that NaOH has a negative influence on the diffusion of Pb(II) within a NaOH concentration range of 2.5 ∼ 4.5 M. In addition, NaOH has a positive influence on the apparent heterogeneous rate constant of Pb(II) oxidation reactions within a NaOH concentration range of 2.5 ∼ 3 M, but a negative influence within a NaOH concentration range of 3 ∼ 4.5 M. XRD and SEM were employed to investigate the effects of NaOH concentration on phase composition and surface microstructures of deposits. The results show that PbO 2 synthesized in an alkaline solution consists of pure α phase. The deposits are all composed of rounded nanocrystallites, except for the deposit synthesized in a solution of 3 M NaOH, which exhibited rod-like crystallite. Lead dioxide (PbO 2 ) has attracted considerable attention, owing to its low electrical resistivity, low cost, ease of preparation, good chemical stability in acid media, high overpotential for oxygen evolution reactions (OER), and relatively large surface area.1-4 Thus, lead dioxide has already been used in lead batteries, 5-7 ozone generation, 8,9 waste water treatment, 10-12 analytical sensors, 13 and the electrowinning process.14 It is well known that PbO 2 has two phases: the α phase and β phase. Electrodeposition is a traditional way to prepare these two phases of PbO 2 . 15 The conditions (mainly composition and temperature) of the synthesizing bath determine the phase of deposits. 16 To the best of our knowledge, α-PbO 2 is less studied than β-PbO 2 due to its lower electrochemical activity and electrical conductivity.17 Despite the shortcomings mentioned above, α-PbO 2 is chemically more stable than β-PbO 2 ; consequently, it promotes longer life cycles of lead-acid batteries.18 Besides, it is beneficial to ozone production, 19 presents the same performance of β-PbO 2 as a pH sensor 20 and is the first step in the electrochemical fabrication of metallic lead nanowires (NWs). 21 In addition, as an interlayer of the electrode, the binding force of β-PbO 2 and its underlayer would be improved by α-PbO 2 .22 Pure α-PbO 2 can be deposited from an acetic acid lead bath 23 or a methanesulfonic acid lead bath 24 at suitable conditions. However, a stress-free α-PbO 2 can be obtained by electrodeposition from an alkaline lead bath. 25,26 Cyclic voltammetry (CV) technology is a general and powerful method to study reactions in aqueous solutions, surface adsorption and deposition. 27,28 It can be used to investigate the kinetics ...

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“…This peak correspond to the oxidation of As(III) to As(V) [39]. The reaction is likely electrocatalyzed by the formation of PtOH on the electrode [41,42]. The peak increased linearly with the addition of As(III) (Fig.…”

mentioning

confidence: 88%

Determination of Arsenic(III) Using Platinum Nanoparticle‐Modified Screen‐Printed Carbon‐Based Electrodes

Sanllorente¹,

Domínguez‐Renedo²,

Arcos‐Martínez³

2009

Electroanalysis

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The electrochemical detection of arsenic(III) was investigated on platinum nanoparticle-modified carbon-based screen-printed electrodes (PtNPs/SPCEs) in 1 M aqueous H 2 SO 4 . PtNPs/SPCEs were prepared by electrochemical deposition of K 2 PtCl 6 . The resulting electrode surfaces were characterized with scanning electron microscopy (SEM). By using the As(III) oxidation peak for the analytical determination, there is no interference from Cu(II) if present in contrast to the other metal surfaces typically used for the detection of arsenic in electrochemistry. Precision of the proposed method was very good and a relative good accuracy determined by analysis of a certificate sample and in a spiked tap water sample. Electroinactive As(V) was reduced to As(III) by sodium thiosulfate prior to determination. The detection limit for As(III) obtained was 5.68 mg L À1. In terms of reproducibility, the precision of the above mentioned method in % RSD was calculated at 2.27%.

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Electrocatalytic Oxidation of As(III): I . Voltammetric Studies at Pt Electrodes in

Cited by 59 publications

References 23 publications

A study on the evolution of arsine during arsenic electrodeposition: The influence of ammonium citrate

A study on the evolution of arsine during arsenic electrodeposition: The influence of ammonium citrate

An RDE Investigation of NaOH Effect on Electrosynthesis of Lead Dioxide in Alkaline Solution

Determination of Arsenic(III) Using Platinum Nanoparticle‐Modified Screen‐Printed Carbon‐Based Electrodes

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