Abstract
The cyanide oxidation on vitreous carbon (VC), stainless steel 304 (SS 304) and titanium (Ti) was investigated through a voltammetric study of cyanide solutions also containing copper ions. Results showed that cyanide oxidation occurs by means of a catalytic mechanism involving adsorbed species as CN−, Cu(CN)43− or Cu(CN)42− depending on the electrode material. It was observed that on VC, the adsorption of Cu(CN)43− controlled the oxidation rate. Instead, for SS 304 and Ti, the adsorption of CN− controlled the global process. However, in all cases, the adsorption of Cu(CN)43− on the electrode surface was required for the catalytic oxidation of CN−. Voltammetric experiments for solutions containing cyanide oxidation products, such as cyanogen (CN)2 and cyanate (CNO−), confirmed that the adsorbed species mentioned above controlled the catalytic oxidation of CN− depending on the electrode material. A voltammetric identification of the oxidation products showed that cyanogen, (CN)2 tended to adosorb on VC, while the formation of cyanate, CNO− predominated on SS 304.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
