Electrochemical Dissolution of Silver Sulfide in Aqueous Acetate
Alkaline Media at Cathodic Potentials
G. V. Makarov, I. G. Soboleva, and A. G. Makarov
Lipetsk State Technical University, ul. Moskovskaya 30, Lipetsk, 398600 Russia
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Received January 27, 2004
Abstract — Cathodic dissolution of silver sulfide in acetate media containing no silver ions in a pH range from 8.32 to 13.02 is studied by voltammetric technique. The partial reaction orders in hydroxyl, acetate, and hydrogen ions are –0.88, –0.13, and 0.01, respectively, while the overall reaction order is –0.1. A kinetic equation and a scheme of cathodic reduction of 
-Ag2S are proposed. The presence of silver in solid products of electrolysis is confirmed by XRD analysis. The presence of sulfur in the aqueous medium is revealed by x-ray fluorescence analysis.
-Ag2S are proposed. The presence of silver in solid products of electrolysis is confirmed by XRD analysis. The presence of sulfur in the aqueous medium is revealed by x-ray fluorescence analysis.