Study on production of free hydroxyl radical and its reaction with salicylic acid at lead dioxide electrode

Ai, Shiyun; Wang, Qingjiang; Li, Hui; Jin, Litong

doi:10.1016/j.jelechem.2005.01.002

Cited by 78 publications

(31 citation statements)

References 27 publications

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“…Studies of the corrosion mechanism of lead metal at potentials sufficient for oxygen evolution suggest that the mechanism by which lead metal is oxidised proceeds via attack from hydroxyl radicals, which are intermediates in the oxygen evolution reaction (Ai et al, 2004;Ai et al, 2005;Cong and Wu, 2007). Using the findings from this study it is postulated that during polarisation of PbAg anodes at the oxygen evolution potential, Ag in the PbAg alloy is oxidised to as sites for the oxygen evolution reaction for a short period (~100 s).…”

Section: Discussion On the Role Of Silver In Reducing The Corrosion Rmentioning

confidence: 99%

The role of silver in enhancing the electrochemical activity of lead and lead–silver alloy anodes

McGinnity

Nicol

2014

Hydrometallurgy

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The role of silver as an alloying additive to reduce the overpotential of the oxygen evolution reaction on lead anodes used in the electrowinning of zinc has not previously been established. This paper summarizes the results of a detailed study of the mechanism of the action of silver both as an additive to the alloy and in solution. The presence of Ag 2 O 2 in the oxide layer was confirmed on Pb electrodes anodised in sulphuric acid electrolytes containing silver ions. The enhanced electrochemical activity of PbAg alloy anodes over Pb is attributed to the presence of Ag 2 O 2 in the corrosion layer.

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Section: Discussion On the Role Of Silver In Reducing The Corrosion Rmentioning

confidence: 99%

The role of silver in enhancing the electrochemical activity of lead and lead–silver alloy anodes

McGinnity

Nicol

2014

Hydrometallurgy

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“…the i peak value observed for cycle 1 can be reproduced. In fact, it has been demonstrated [49,50] that, during water oxidation, anodes with high oxygen evolution overpotential such as PbO 2 make it possible to produce adsorbed hydroxyl radicals from reaction (5) that oxidize the polymeric deposit formed on their surface, as indicated in reaction (6): …”

Section: Methodsmentioning

confidence: 99%

Anodic oxidation of mecoprop herbicide at lead dioxide

2008

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The electrochemical oxidation of an aqueous solution containing mecoprop (2-(2-methyl-4-chlorophenoxy)propionic acid) has been studied at PbO 2 anodes by cyclic voltammetry and bulk electrolysis. The influence of current density, hydrodynamic conditions, temperature and pH on the degradation rate and current efficiency is reported. The results obtained show that the use of PbO 2 leads to total mineralization of mecoprop due to the production of oxidant hydroxyl radical electrogenerated from water discharge. The current efficiency for the electrooxidation of mecoprop is enhanced by low current density, high recycle flow-rates and high temperature. In contrast, the pH effect was not significant. It has also been observed that mecoprop decay kinetics follows a pseudo-first-order reaction and the rate constant increases with rising current density.

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“…Aromatic compounds, such as salicylic acid and phenylalanine, are widely used to this aim, since their reactions with OH radicals, termed aromatic hydroxylations, display very high kinetic constants [17]. The quantitative determination is performed following either the degradation of the probe or the formation of characteristic products that can be easily detected with a lot of analytical techniques like EPR [18,19], high performance liquid chromatography with electrochemical detection (HPLC-ED) [20,21], capillary electrophoresis (EC) [22], gas chromatography/mass spectrometry (GC-MS) [23], chemiluminescence [24], and micellar electrokinetic capillary chromatography (MECC) [25]. The concentration of a characteristic product is expressed by the following equation:…”

Section: Introductionmentioning

confidence: 99%