Ferrates(Fe-VI, Fe-V, and Fe-IV) oxidation of iodide: Formation of triiodide

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F16%3A33160023" target="_blank" >RIV/61989592:15310/16:33160023 - isvavai.cz</a>
Result on the web
<a href="http://www.sciencedirect.com/science/article/pii/S004565351530179X" target="_blank" >http://www.sciencedirect.com/science/article/pii/S004565351530179X</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.chemosphere.2015.09.091" target="_blank" >10.1016/j.chemosphere.2015.09.091</a>

Result language
angličtina
Original language name
Ferrates(Fe-VI, Fe-V, and Fe-IV) oxidation of iodide: Formation of triiodide
Original language description
The presence of iodide (I-) in water during disinfection and oxidative treatment of water is a potential health concern because of the formation of iodinated disinfection by-products (DBPs), which may be more toxic than chlorinated DBPs. The kinetics of the oxidation of I- by a greener oxidant, ferrate(VI) ((FeO42-)-O-VI, Fe(VI)) was determined as a function of pH. The second-order rate constants (k, M-1 s(-1)) decreased from 3.9 x 10(4) M-1 s(-1) at pH 5.0 to 1.2 x 10(1) M-1 s(-1) at pH 10.3. The kinetics results could be described by the reactivity of monoprotonated species of Fe(VI) ((HFeO4-)-O-VI) with I- In excess I- concentration, triiodide (I-3(-)) was formed and the stoichiometry of similar to 1:1 ([Fe(VI)]:[I-3(-)]) was found in both acidic and basic pH. Ferrate(V) ((FeO43-)-O-V, Fe(V)) and ferrate(IV) ((FeO44-)-O-VI, Fe(IV)) also showed the formation of I-3(-) in presence of excess I-. A mechanism of the formation of I-3(-) is proposed, which is consistent with the observed stoichiometry of 1:1. The oxidative treatment of I- in water will be rapid (t(1/2) = 0.6 s at pH 7.0 using 10 mg L-1 K2FeO4). The implications of the results and their comparison with the oxidation of I- by conventional disinfectants/oxidants in water treatment are briefly discussed.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CA - Inorganic chemistry
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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