The elimination of cyanide from aqueous copper cyanide solutions by oxidation under UV illumination using titanium oxide (TiO2) and zinc oxide (ZnO) as catalyst has been investigated. The study has been carried out by determining the yield of cyanide elimination at different irradiation times, initial cyanide concentrations and pH. It has been observed that cyanide is photo‐oxidised with higher yields in presence than in absence of copper in solution when TiO2 is used as photocatalyst, while the opposite behaviour is reported when ZnO is the photocatalyst employed. This fact is related with the feasibility in which copper species are able to react with photogenerated electrons in the conduction band of the TiO2 particles. Finally, the elimination of cyanide, both free and complexed, from a sample of an electroplating bath has also been studied. The results show that the photocatalytic method is very efficient in the elimination of cyanide in aqueous dilute solutions. Copyright © 1992 Society of Chemical Industry
|Journal||Journal of Chemical Technology & Biotechnology|
|Publication status||Published - 1 Jan 1992|
- copper cyanide solutions.
- semiconductor oxides