Low-temperature catalytic oxidation sulfide ions in aqueous solutions on aNi-oxide system

Catalytic oxidation of sulfide ions in aqueous solutions by air oxygen has been investigated using a Ni-oxide system as a catalyst. The kinetics and t he selectivity of the oxidation process were studied by varying the pH, cat alyst amount and reaction temperature. A reduction/oxidation mechanism of t he reaction has been supposed comprising interaction between the surface ac tive oxygen of the catalyst and HS- and reoxidizing of the reduced catalyst by the dissolved oxygen. The results obtained show that the Ni-oxide syste m is a promising catalyst for practical application.