Catalytic oxidation of SCN- and CN- ions from aqueous solutions.

Oxidation of inorganic contaminants, such as thiocyanate and cyanide ions, by ozone in water has improved significantly in the presence of solid catalysts based on nickel and cobalt oxides supported on alumina. It can be considered that the hydroxyl radical produced by catalytic decomposition of ozone over the catalyst's surface was responsible for the oxidation of the adsorbed ions. Ozonation efficiency was increased by 20% in the presence of catalytic systems in particular for those systems containing both nickel and cobalt oxide.