Nicotinamide as a Catalyst for Zn2+ Electroreduction in Acetate Buffer

Nieszporek, Jolanta

doi:10.1007/s12678-020-00603-0

Cited by 4 publications

(6 citation statements)

References 25 publications

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“…Accurate theoretical research on the adsorption is possible on mercury electrodes (Kalvoda, 2007;Vyskocil, et al ., 2009;Barek, 2013). Very good reproducibility of the results obtained on the dropping mercury electrode results from homogeneity and purity of the double layer interface mercury -solution in comparison to solid electrodes and the possibility of using various measurement methods (Nieszporek, et al, 2019;Nieszporek , 2020;Kaliszczak, et al, 2020;Nosal-Wiercinska., et al 2020;Prado, et al, 2001;Sieńko et al, 2009;Nieszporek et al, 2018;Nieszporek, 2013).…”

Section: Introductionmentioning

confidence: 98%

Adenine adsorption in different pH acetate buffer

Gugała-Fekner¹

2021

Physicochem. Probl. Miner. Process.

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The research results facilitate the description of adenine adsorption on the mercury electrode with reference to the pH of the supporting electrolyte which was the acetate buffer with pH of 3, 4, 5 and 6. The thermodynamic analysis indicates that the curves of the differential capacity of the studied systems with adenine do not overlap with the curves for the supporting electrolyte -the acetate buffer. This indicates the occurrence of adsorption of the studied compound on the mercury electrode within the whole range of applied concentrations in the case of every tested pH value of the acetate buffer. Adsorption energy and interaction constants were determined using the Frumkin isotherm and the viral isotherm. It was demonstrated that a adenine molecule is adsorbed on the mercury electrode in a buffer with pH 4, 5 and 6 through the negative pole, whereas in a buffer with pH 3 through the positive pole. Physical adsorption was observed in the studied systems. This is indicated by the occurrence of a typical maximum on the curve of the relation the relative surface excess amounts and the potential of the electrode; crossed curves of the following relation surface charge of the electrode from its potential (surface charge of the electrode from its potential σ = f(E)) at one point and, thus, the possibility of determining electrical parameters characterizing maximum adsorption as well as the absence of linearity of the function free energy of adsorption as a function of electrode potential ∆G 0 = f(E).

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Section: Introductionmentioning

confidence: 98%

Adenine adsorption in different pH acetate buffer

Gugała-Fekner¹

2021

Physicochem. Probl. Miner. Process.

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“…Figure 1 shows slight frequency dispersion in almost entire range of potentials. Thus, the equilibrium capacities were obtained using the relation: C=f(ω), as a result of the extrapolation of differential capacitances measured for the subsequent alternating current frequency values to the angular frequency: ω=0 [17] . This procedure was used for all experimental systems with different NC concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…In solutions with lower NC concentrations the curves C=f(E) have visible hump located close to the pzc. It can be assumed that it is related to the adsorption of the anionic form of dissociated NC [17,19–21] . As the NC concentration increases, this hump becomes lower and wider and shifts towards more negative potentials.…”

Section: Resultsmentioning

confidence: 99%

“…[37] Similar catalytic effects were obtained with another form of vitamin B 3 -nicotinamide (NAM). [17] This is evidenced by the following changes: with an increase in the concentration of NAM, the values of peak currents in SWV voltammograms increase, the values of minimum activation resistance of the electrode reaction (R a(min) ) determined from EIS spectra (Figure 11A) decrease and the values of individual standard rate constants k s1 and k s2 of the electrode process increase (Figure 11B). Nevertheless, in the range of lower vitamin concentrations, NAM is a better catalyst, while above the concentration c B3 > 1 • 10 À 2 mol • dm À 3 , the electroreduction process of Zn 2 + ions is accelerated more effectively by NC.…”

Section: Conflict Of Interestmentioning

confidence: 98%

“…It can be assumed that it is related to the adsorption of the anionic form of dissociated NC. [17,[19][20][21] As the NC concentration increases, this hump becomes lower and wider and shifts towards more negative potentials. This in turn is probably ChemPhysChem due to the changes in the electrostatic interactions between adsorbed NC À molecules.…”

Section: Adsorption Of Nicotinic Acid At the Mercury Electrode/acetat...mentioning

confidence: 99%

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

Nieszporek

2022

ChemPhysChem

Self Cite

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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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Comparison of adsorptive properties of adenine, cytosine, guanine and thymine in acetate buffer with pH 4.

Gugała-Fekner

2022

Preprint

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Adsorptive properties of adenine, cytosine, guanine and thymine in the acetate buffer at pH = 4 were determined using experimental data obtained from measurements of the differential volume of the double layer interface, the zero charge potential and the surface tension at this potential. The possibility of determining parameters Emax and qmax and the bell-shaped relative excess amounts indicate the physical nature of adsorptions of the nitrogen bases in question on the mercury electrode, which must be associated with the fact that the adsorbed particles exhibit vertical or diagonal orientation.

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Nicotinamide as a Catalyst for Zn2+ Electroreduction in Acetate Buffer

Cited by 4 publications

References 25 publications

Adenine adsorption in different pH acetate buffer

Adenine adsorption in different pH acetate buffer

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

Comparison of adsorptive properties of adenine, cytosine, guanine and thymine in acetate buffer with pH 4.

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