000199084 001__ 199084
000199084 005__ 20181203023512.0
000199084 0247_ $$2doi$$a10.1021/es500804g
000199084 02470 $$2ISI$$a000335720100062
000199084 037__ $$aARTICLE
000199084 245__ $$aReaction of Ferrate(VI) with ABTS and Self-Decay of Ferrate(VI): Kinetics and Mechanisms
000199084 269__ $$a2014
000199084 260__ $$aWashington$$bAmer Chemical Soc$$c2014
000199084 300__ $$a9
000199084 336__ $$aJournal Articles
000199084 520__ $$aReactions of ferrate(VI) during water treatment generate perferryl(V) or ferryl(IV) as primary intermediates. To better understand the fate of perferryl(V) or ferryl(IV) during ferrate(VI) oxidation, this study investigates the kinetics, products, and mechanisms for the reaction of ferrate(VI) with 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) and self-decay of ferrate(VI) in phosphate-buffered solutions. The oxidation of ABTS by ferrate(VI) via a one-electron transfer process produces ABTS•+ and perferryl(V) (k = 1.2 × 106 M–1 s–1 at pH 7). The perferryl(V) mainly self-decays into H2O2 and Fe(III) in acidic solution while with increasing pH the reaction of perferryl(V) with H2O2 can compete with the perferryl(V) self-decay and produces Fe(III) and O2 as final products. The ferrate(VI) self-decay generates ferryl(IV) and H2O2 via a two-electron transfer with the initial step being rate-limiting (k = 26 M–1 s–1 at pH 7). Ferryl(IV) reacts with H2O2 generating Fe(II) and O2 and Fe(II) is oxidized by ferrate(VI) producing Fe(III) and perferryl(V) (k = 107 M–1 s–1). Due to these facile transformations of reactive ferrate(VI), perferryl(V), and ferryl(IV) to the much less reactive Fe(III), H2O2, or O2, the observed oxidation capacity of ferrate(VI) is typically much lower than expected from theoretical considerations (i.e., three or four electron equivalents per ferrate(VI)). This should be considered for optimizing water treatment processes using ferrate(VI).
000199084 6531_ $$awater treatment
000199084 6531_ $$aferrate
000199084 700__ $$aLee, Yunho
000199084 700__ $$aKissner, Reinhard
000199084 700__ $$0245482$$avon Gunten, Urs$$g210253
000199084 773__ $$j48$$k9$$q5154–5162$$tEnviron. Sci. Technol.
000199084 909C0 $$0252250$$pLTQE$$xU12400
000199084 909CO $$ooai:infoscience.tind.io:199084$$particle$$pENAC
000199084 917Z8 $$x106743
000199084 937__ $$aEPFL-ARTICLE-199084
000199084 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000199084 980__ $$aARTICLE