| Abstract |
| In this study, Fe(VI) was applied to treat iron sulfide through oxidation of sulfide. Oxidation of FeS by Fe(VI) was studied at pH 9.2 with variation of the amount of FeS and the ionic strength at 10-4 M Fe(VI). Oxidation efficiency of FeS was evaluated by reduction efficiency of Fe(VI) with UV/VIS spectrophotometric analysis. Fe(VI) reduction increased as the amount of FeS increased. In order to discuss the kinetics of the Fe(VI) reduction, the data was fitted with the second-order rate expression. From the kinetic analysis, the second-order rate constant was determined as 4,940 L/mol/sec. Rate of Fe(VI) reduction by FeS gradually increased as the ionic strength increased. Reduction efficiency of Fe(VI) was quite similar without depending on the type of background electrolytes, except NaNO2 and Na2SO3. This result can suggest that fully oxidized anions such as ClO4-, NO3-, SO42-, PO43- as well as redox insensitive anion such as Cl- do not involve in the redox reaction between Fe(VI) and FeS. |
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| Key Words |
| metal sulfide, ferrate, oxidation, reduction |
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