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Shin, Jaedon,von Gunten, Urs,Reckhow, David A.,Allard, Sebastien,Lee, Yunho American Chemical Society 2018 Environmental science & technology Vol.52 No.13
<P>Oxidative treatment of iodide-containing waters can form toxic iodinated disinfection byproducts (I-DBPs). To better understand the fate of iodine, kinetics, products, and stoichiometries for the reactions of ferrate(VI) with iodide (I<SUP>-</SUP>) and hypoiodous acid (HOI) were determined. Ferrate(VI) showed considerable reactivities to both I<SUP>-</SUP> and HOI with higher reactivities at lower pH. Interestingly, the reaction of ferrate(VI) with HOI (<I>k</I> = 6.0 × 10<SUP>3</SUP> M<SUP>-1</SUP> s<SUP>-1</SUP> at pH 9) was much faster than with I<SUP>-</SUP> (<I>k</I> = 5.6 × 10<SUP>2</SUP> M<SUP>-1</SUP> s<SUP>-1</SUP> at pH 9). The main reaction pathway during treatment of I<SUP>-</SUP>-containing waters was the oxidation of I<SUP>-</SUP> to HOI and its further oxidation to IO<SUB>3</SUB><SUP>-</SUP> by ferrate(VI). However, for pH > 9, the HOI disproportionation catalyzed by ferrate(VI) became an additional transformation pathway forming I<SUP>-</SUP> and IO<SUB>3</SUB><SUP>-</SUP>. The reduction of HOI by hydrogen peroxide, the latter being produced from ferrate(VI) decomposition, also contributes to the I<SUP>-</SUP> regeneration in the pH range 9-11. A kinetic model was developed that could well simulate the fate of iodine in the ferrate(VI)-I<SUP>-</SUP> system. Overall, due to a rapid oxidation of I<SUP>-</SUP> to IO<SUB>3</SUB><SUP>-</SUP> with short-lifetimes of HOI, ferrate(VI) oxidation appears to be a promising option for I-DBP mitigation during treatment of I<SUP>-</SUP>-containing waters.</P> [FIG OMISSION]</BR>