The Effect of Adenine Adsorption on Zn (II) Electroreduction in Acetate Buffer

Gugała-Fekner, Dorota

doi:10.17344/acsi.2017.3652

Cited by 5 publications

(16 citation statements)

References 20 publications

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“…A similar character of adsorption of adenine on the mercury electrode was observed in buffer with pH 4 [26] and guanine at pH 4 and 6 [27]. …”

Section: Resultssupporting

confidence: 55%

“…The physical character of the adsorption of adenine on the mercury electrode is evidenced by: (1) the possibility of determination of the charge and maximum adsorption potential in both examined buffers, and (2) the fact that the curves showing the dependence of relative excess values against the potential are bell-shaped. A similar character of adsorption of adenine on the mercury electrode was observed in buffer with pH 4 [ 26 ] and guanine at pH 4 and 6 [ 27 ].…”

Section: Discussionsupporting

confidence: 55%

“…In acetate buffers with pH 4 [ 26 ], 5, and 6, as the concentration of organic matter increases, the potential of the zero charge is shifted towards the more potential negative ones. This indicates that the adenine molecule adsorbs to the surface of the electrode with a negative pole or aromatic ring.…”

Section: Discussionmentioning

confidence: 99%

“…This indicates that the adenine molecule adsorbs to the surface of the electrode with a negative pole or aromatic ring. In the pH 3 buffer, the adenine molecule is more strongly protonated and adsorbed to the positive mercury electrode [ 26 ].…”

Section: Discussionmentioning

confidence: 99%

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Adsorption of adenine on mercury electrode in acetate buffer at pH 5 and pH 6 and its effect on electroreduction of zinc ions

Gugała-Fekner

2018

Monatsh Chem

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The measurements of double-layer differential capacitance, zero charge potential, and surface tension at that potential allowed us to examine the adsorption properties of adenine on the mercury surface from the neat buffer solution, i.e., the acetate buffer at pH 5 and pH 6. The systems obtained at such pH values were close to physiological fluids in their characteristics. The adsorption energy and interaction constants were determined using Frumkin isotherm and virial isotherm. It was shown that the adenine molecule is adsorbed on the mercury electrode with its negative pole against the electrode surface. Using the cyclic voltammetry technique and measuring Faraday impedance, an increasing effect of adenine on the kinetics of zinc ion electroreduction was found. In both buffer solutions, the neutral adenine molecules can form on the surface of the working electrode, an unstable active complex with depolarizer ions, facilitating electron exchange.Graphical abstract

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“…A similar character of adsorption of adenine on the mercury electrode was observed in buffer with pH 4 [26] and guanine at pH 4 and 6 [27]. …”

Section: Resultssupporting

confidence: 55%

Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Adsorption of adenine on mercury electrode in acetate buffer at pH 5 and pH 6 and its effect on electroreduction of zinc ions

Gugała-Fekner

2018

Monatsh Chem

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“…The rate of electrochemical reactions often changes in the presence of inactive organic substances adsorbed on the electrode. Research literature widely discusses the issue of deceleration of electroreduction by various inorganic depolarisers . However, papers discussing catalysis of electrode processes by selected surface‐active compounds are less frequent .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Supporting Electrolyte Concentration on Zinc Electrodeposition Kinetics from Methimazole Solutions

2019

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The kinetic parameters of Zn2+ ion electroreduction in sodium perchlorate used as the supporting electrolyte on the mercury electrode in the presence of methimazole were determined using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and DC polarography. The two‐stage nature of this process was demonstrated. Both steps are catalysed by a methimazole. The size of the acceleration effect depends on the concentrations of methimazole and the supporting electrolyte. The acceleration of the electrode process involves the formation of active complexes between the depolarizer ions and methimazole on the electrode surface. These complexes facilitate the exchange of charge between the electrode and zinc ions during electroreduction process. The change of the hydrating sphere of the zinc ion is also important here. This in turn depends on its oxidation state and the concentration of the supporting electrolyte.

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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 Effect of Adenine Adsorption on Zn (II) Electroreduction in Acetate Buffer

Cited by 5 publications

References 20 publications

Adsorption of adenine on mercury electrode in acetate buffer at pH 5 and pH 6 and its effect on electroreduction of zinc ions

Adsorption of adenine on mercury electrode in acetate buffer at pH 5 and pH 6 and its effect on electroreduction of zinc ions

The Effect of Supporting Electrolyte Concentration on Zinc Electrodeposition Kinetics from Methimazole Solutions

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

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