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Removal of cyanides by electrooxidation
Lidia Szpyrkowicz1, Francesco Ricci, Salvatore Daniele
1Department of Environmental Sciences, University of Venice, Dorsoduro 2137, 30123 Venice, Italy. lidia@unive.it
Annali Di Chimica
|December 16, 2003
Summary
This study shows copper oxide electrocatalysts can remove cyanide from metal plating wastewater. Cyanide oxidation occurs at a lower potential than hydroxide discharge, making it an efficient method.
Area of Science:
- Electrochemistry
- Environmental Chemistry
- Materials Science
Background:
- Metal plating wastewater often contains toxic cyanides complexed with copper.
- Efficient and selective removal of cyanide is crucial for environmental protection.
Purpose of the Study:
- To investigate the electro-oxidation of copper-cyanide complexes in wastewater.
- To explore the potential of copper oxide as an electrocatalyst for cyanide removal.
Main Methods:
- Detailed voltammetric studies were performed.
- In situ formation of copper oxide electrocatalytic films was analyzed.
Main Results:
- Copper oxide film formation and cyanide electro-oxidation occur at similar anode potentials.
- Cyanide elimination at copper oxide happens at a lower potential than hydroxide discharge.
Conclusions:
- Copper oxide is an effective electrocatalyst for cyanide removal from metal plating wastewater.
- The process offers selective cyanide oxidation at lower potentials, reducing energy consumption and by-product formation.