The electrochemical oxidation of alkaline copper cyanide solutions

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TypeArticle
Journal titleElectrochimica Acta
Volume47
Pages32453256; # of pages: 12
Subjectcyanide oxidation; copper complexes; hydroxide ions; copper oxide and nitrate
AbstractA 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.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52284
NPARC number16285573
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Record identifierbbdf5eb3-02ec-482a-a07c-4c40947424e7
Record created2010-11-01
Record modified2016-05-09
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