Cadmium cyanide, electrochemical

The process can be used to treat dissolved metals and is commonly used in groundwater treatment for the reduction and precipitation of hexavalent chromium, as well as in the oxidation of cyanide wastes (at concentrations up to 10%). Other potential applications of electrochemical treatment include remediation of arsenic, cadmium, molybdenum, aluminum, zinc,... 

Fig. 10. Electrochemical reactor used for the simultaneous treatment and removal of cyanide and cadmium from a metal-finishing waste stream. (Adapted from [44]).

Examples of electrochemically initiated metal ion substitution reactions have been described for the case of substitution of high-spin iron by cadmium ions [49, 50], high-spin iron by nickel, and silver by nickel [51] and high-spin iron ions ]52]. The reasons for the proceeding of these electrochemically initiated substitution reactions have been ascribed as well to the labilization of the cyanide ions in certain oxidation states of the metal ions of the involved PCMs. 

Reade GW, Bond P, Ponce de Leon C, Walsh FC (2004) The application of reticulated vitreous carbon rotating cylinder electrodes to the removal of cadmium and copper i(ms from solution. J Chem Tech Biolechnol 79 946—953 10. Szpyrkowicz L, Zilio-Giandi F, Kaul SN, Rigraii-Stem S (1998) Electrochemical treatment of copper cyanide wastewaters using stainless steel electrodes. Water Sci Tech 38 261—268... 

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