Adszorpciós folyamatok vizsgálata polikristályos aranyelektrödon

Translated title of the contribution: Az l-hidroxi-etän-1,1 -difoszfonsav inhibitorhatásának tanulmányozása radioizotópos nyomjelzéssel, I

I. Felhősi, Ékes Renáta, Baradlai Pál, I. Bakó, K. Varga, És Kálmá, N. Erika

Research output: Contribution to journalArticle

Abstract

Investigation of inhibition effects of 1-hydroxy-ethane-1,1-diphosphonic acid by radiotracer technique, I. A study of sorntion processes on polycrystalline gold. The aim of the present work is to investigate the time, potential, concentration and pH dependences of the adsorption of 1-hydroxy-ethane-1,1-diphosphonic acid (HEDP) on polycrystalline gold electrode by in-situ radiotracer 'foil' method and cyclic voltammetry. The experimental results reveal several important findings on the sorption and redox behaviours of the HEDP molecule, which may contribute to the better understanding of its inhibition mechanism on alloys of industrial importance. The following conclusions can be drawn from the experimental data (a) The adsorption of HEDP on polycrystalline gold is dependent on electrode potential, solution concentration and pH. (b) The surface excess value depends on the starting point and actual value of the electrode potential, and the direction of polarization. Reversible accumulation processes have been observed on the oxide-free surface of gold electrode in the potential range of 0.051.00 V, which cause a hysteresis between the Γ-E curves for polarization in anodic and cathodic direction. The HEDP accumulation reaches the quasi-stationary condition in less than l min. (c) The adsorption of HEDP on polycrystalline gold surface increases by increasing the solution concentration. The coverage of adsorbed species is less than one monolayer at c ≤ 10 -3 mol-dm -3. (d) The pH dependent adsorption of HEDP reveals that the relative adsorbability of the HEDP molecule is predominantly influenced by its dissociation degree. The surface excess value is higher, at pH=9, than in neutral or acidic solution. It is most probable that HA 3- and A 4- species, formed from HEDP in solution under equilibrium circumstances, have the highest relative sorption strength. The effect of pH on the adsorption of species can be observed in the anodic and catodic polarization directions as well.

Original languageHungarian
Pages (from-to)208-216
Number of pages9
JournalMagyar Kemiai Folyoirat, Kemiai Kozlemenyek
Volume104
Issue number5
Publication statusPublished - 1998

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Ethane
Acids
Gold
Adsorption
Electrodes
Polarization
Sorption
Molecules
Oxides
Metal foil
Cyclic voltammetry
Hysteresis
Monolayers

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Adszorpciós folyamatok vizsgálata polikristályos aranyelektrödon. / Felhősi, I.; Renáta, Ékes; Pál, Baradlai; Bakó, I.; Varga, K.; Kálmá, És; Erika, N.

In: Magyar Kemiai Folyoirat, Kemiai Kozlemenyek, Vol. 104, No. 5, 1998, p. 208-216.

Research output: Contribution to journalArticle

Felhősi, I. ; Renáta, Ékes ; Pál, Baradlai ; Bakó, I. ; Varga, K. ; Kálmá, És ; Erika, N. / Adszorpciós folyamatok vizsgálata polikristályos aranyelektrödon. In: Magyar Kemiai Folyoirat, Kemiai Kozlemenyek. 1998 ; Vol. 104, No. 5. pp. 208-216.
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AU - Felhősi, I.

AU - Renáta, Ékes

AU - Pál, Baradlai

AU - Bakó, I.

AU - Varga, K.

AU - Kálmá, És

AU - Erika, N.

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