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Published on: August 10, 2017
Direct cyanidation of silver sulfide by heterolytic C-CN bond cleavage of acetonitrile
Biraj Das1, Pinku Saikia1, Mukesh Sharma1
1Department of Chemical Sciences, Tezpur University Assam-784028 India kusum@tezu.ernet.in.
Abstract:
Extraction of silver as silver cyanide from silver sulfide was made possible using acetonitrile as the source of cyanide. The process of cyanidation took place through the oxidation of sulfide to sulfur oxides and cleavage of the C-CN bond of acetonitrile. The reaction was found to be catalyzed by vanadium pentoxide and hydrogen peroxide. The different species involved in the cyanidation process were duly characterized using FTIR, ESI-MS, HRMS, XPS and UV-vis spectroscopic analysis. The mechanism of the cyanidation process was confirmed through in situ FTIR analysis.
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