Kinetic Parameters of the Dissolution of Gold in Thiourea Solutions |
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| Authors: | Kozin L. F. Berezhnoi E. O. Bogdanova A. K. |
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| Affiliation: | (1) V. I. Vernadskii Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine, 32/34 Prospekt Akademika Palladina, 03142 Kyiv, Ukraine;(2) Institute of Applied Optics International Center, 10g Kudryavs'ka Vul., 04053 Kyiv, Ukraine |
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| Abstract: | ![]()
The temperature dependence of the rate constants for the dissolution of gold in thiourea solutions was determined. The activation energies calculated suggest that the rate of gold dissolution is diffusion-controlled at 5-22 °C but is kinetically-controlled at 25-60 °C (Ea = 42.83 kJ/mol). Auger spectroscopy was used to study the composition of the surface adsorption layers and a mechanism for the passivation of the reactive surface during the gold dissolution process was proposed. |
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| Keywords: | gold thiourea rate constants activation energies adsorption layers Auger spectroscopy |
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