The catalytic influence of methionine on the electroreduction of Bi(III) ions in chlorates (VII) solutions with varied water activity

Nosal‐Wiercińska, Agnieszka

doi:10.1016/j.jelechem.2011.01.028

Cited by 20 publications

(31 citation statements)

References 28 publications

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“…5). It is similar to the previously studied influence of methionine on Bi(III) ions electroreduction [15].…”

Section: Resultssupporting

confidence: 89%

“…It has also been shown that the process of Bi(III) ion electroreduction is catalysed by methionine [15], cysteine and cystine [16,17]. Values of the standard rate constant k s [4] indicate that the catalytic effect of amino acids grows-in the order of cystine < methionine < cysteine-for chlorates(VII) with high water activity (from 1 to 4 mol dm…”

Section: Introductionmentioning

confidence: 99%

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The Catalytic Impact of Ethionine on the Multi-Step Electroreduction of Bi(III) Ions in Chlorates(VII) Solutions

Nosal‐Wiercińska

Grochowski

2017

Electrocatalysis

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It was concluded that the presence and the protonation of the ethionine (Et) have effects on the rate of the multistep process of Bi(III) electroreduction in the 2 mol dmchlorates(VII). The catalytic activity of ethionine increases with increasing amounts of NaClO 4 in the basic electrolyte solution. Increased amounts of HClO 4 in chlorate(VII) solutions causes a decreased rate of the Bi(III) ion electroreduction process in the presence of ethionine. This confirms the assumption on the variety of active complexes mediating the passage of electrons.

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“…5). It is similar to the previously studied influence of methionine on Bi(III) ions electroreduction [15].…”

Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

The Catalytic Impact of Ethionine on the Multi-Step Electroreduction of Bi(III) Ions in Chlorates(VII) Solutions

Nosal‐Wiercińska

Grochowski

2017

Electrocatalysis

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“…2a). At the same time, reduction of peak width in the half of their height is observed which evidences the increase in reversibility of Bi(III) ion electroreduction with water activity drop [14][15][16][17]. Also, the picture of DC polarographic waves of Bi(III) ion electroreduction in the presence of ethionine [21] at all the studied concentrations of chlorates (VII) confirms the increase of electrode process reversibility.…”

Section: Kinetic Studiessupporting

confidence: 58%

“…In such form, it is much easier to Breach^the electrode surface [13]. Figure 4a, b shows insignificant changes of ΔE a-c with change of electrode polarization rate in all the studied solutions of basic electrolyte which points out at the chemical reaction Bi-Et complex formation controlling the electroreduction rate of Bi(III) ions [14]. The formation of this complex is favored by the ethionine adsorption on mercury [21].…”

Section: Kinetic Studiesmentioning

confidence: 91%

“…It was found that an essential role in the electrode process acceleration is played by the ability of organic substance, undergoing adsorption on the electrode, to form complexes with the depolarizer in the circum electrode layer and location of the depolarizer reduction potential in the area of labile adsorption equilibrium of the organic substance [7,12]. The previous studies proved a significant effect of water activity [13], some amino acids [14][15][16][17], and change of the protonation of the amino acids on mechanism and kinetics of Bi(III) ions electroreduction [18][19][20][21], which developed the interpretation of the Bcap-pair^effect mechanism [11].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Protonated Ethionine Adsorption on Bi(III) Electroreduction in Chlorate(VII) Solutions with Varied Water Activity

Nosal‐Wiercińska

Grochowski

2018

Electrocatalysis

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The Bi(III) electroreduction in the presence of the ethionine (Et) was studied under its different protonation and changes of water activity. In order to determine adsorption and kinetic parameters, the following were applied: DC polarography, square wave voltammetry (SWV), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The influence of ethionine on the double-layer parameters at the electrode/chlorate (VII) interface and multistep Bi(III) ion electroreduction was found. The multistep Bi(III) electroreduction process is controlled by the kinetics of the formation of active Bi-Et complexes on the electrode surface. The size of the catalytic effect is connected with the equilibrium of the reaction creating active complexes before the successive transition of electrons.

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“Cap‐Pair” Effect as the Reason of the Catalytic Properties of Nicotinic Acid: Experimental and Theoretical Studies

Nieszporek

2022

ChemPhysChem

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The influence of nicotinic acid (NC) on the kinetics and the mechanism of electroreduction of Zn2+ ions in the acetate buffer (pH=6.0) was investigated using electrochemical methods (EIS, CV, SWV and DC). It was shown that the anions of NC catalyze the electrode reaction (cap‐pair effect) by adsorbing on the surface of the mercury electrode. The catalytic activity of NC is due to its ability to form active NC−Zn2+ complexes on the electrode surface, facilitating the electron transfer process. However, no evidence of the formation of such complexes in the solution was found using classical molecular dynamics. Moreover, it was proved that the electroreduction of Zn2+ ions in the presence of NC is a two‐stage process. The first stage involves the transfer of the first electron, preceded by the partial loss of the hydration shell by the Zn2+ ions and formation of the active complex. Moreover, it was shown that in the range of lower concentrations, c≤1.10−2 mol.dm−3, the nicotinic acid shows weaker catalytic abilities than another form of vitamin B3 – nicotinamide. In the range of its higher concentrations, the nicotinic acid is a more effective catalyst for the electroreduction of Zn2+ ions.

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The catalytic influence of methionine on the electroreduction of Bi(III) ions in chlorates (VII) solutions with varied water activity

Cited by 20 publications

References 28 publications

The Catalytic Impact of Ethionine on the Multi-Step Electroreduction of Bi(III) Ions in Chlorates(VII) Solutions

The Catalytic Impact of Ethionine on the Multi-Step Electroreduction of Bi(III) Ions in Chlorates(VII) Solutions

The Effect of Protonated Ethionine Adsorption on Bi(III) Electroreduction in Chlorate(VII) Solutions with Varied Water Activity

“Cap‐Pair” Effect as the Reason of the Catalytic Properties of Nicotinic Acid: Experimental and Theoretical Studies

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