| Download | - View accepted manuscript: The electrochemical oxidation of alkaline copper cyanide solutions (PDF, 783 KiB)
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| Author | Search for: Cheng, S. C.1; Search for: Gattrell, M.1; Search for: Guena, T.1; Search for: MacDougall, B.1 |
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| Affiliation | - National Research Council of Canada. NRC Institute for Chemical Process and Environmental Technology
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| Format | Text, Article |
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| Subject | cyanide oxidation; copper complexes; hydroxide ions; copper oxide and nitrate |
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| Abstract | A systematic investigation of the electrochemical oxidation of copper cyanide was carried out. At low pH, cyanide destruction is believed to be catalyzed by the heterogeneous reaction involving adsorbed [Cu(CN)3]2- and possibly [Cu(CN)4]3-. At high pH, rapid oxidation of cyanide was observed around 0.75 versus Hg/HgO with the formation of a black copper oxide film. This enhanced electrocatalytic activity is believed to be related to the formation of an active copper(III) species. The transition point between low and high pH as a function of cyanide and copper concentrations is discussed. Bulk electrolysis of a copper cyanide solution at 0.90 V oxidized most of the cyanide to cyanate. Prolonged electrolysis further oxidized the cyanate to nitrate. The copper oxide film is found to be catalytic, capable of electro-oxidizing hydroxide to oxygen and cyanate to nitrate. |
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| Publication date | 2002 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRCC 52284 |
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| NPARC number | 16285573 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | bbdf5eb3-02ec-482a-a07c-4c40947424e7 |
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| Record created | 2010-11-01 |
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| Record modified | 2020-03-30 |
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