Abstract
Catalytic oxidation of free cyanide using TiO2 and UV radiation was investigated. The cyanide photo-oxidation rate was determined for different initial cyanide concentrations, pH, catalyst form, sparged gas, and temperature; and followed pseudo-first-order kinetics with respect to cyanide concentration. The TiO2 catalyzed UV–O2 reaction resulted in twice the oxidation rate of free cyanide, however, the rate appeared to be independent of oxygen partial pressure (0.2–1.0atm) at the gas flow rates studied. An increase in temperature from 20 to 35°C did not influence the rate of cyanide oxidation.
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