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Oxidation of inorganic compounds by Ferrate(VI) and Ferrate(V): one-electron and two-electron transfer steps.
Environ Sci Technol. 2010 Jul 01; 44(13):5148-52.ES

Abstract

Ferrate(VI) (Fe(VI)O(4)(-), Fe(VI)) and ferrate(V) (Fe(V)O(4)(3-), Fe(V)) have a high oxidizing power and upon decomposition form a nontoxic byproduct, Fe(III), which makes them environmentally friendly oxidants in water and wastewater treatment. The kinetics of the reaction between Fe(VI) and I(-) was determined using a stopped-flow technique. The second-order rate constants (k, M(-1) s(-1)) for the oxidation of I(-) and other inorganic compounds by protonated ferrate(VI) (HFe(VI)O(4)(-)) and ferrate(V) (Fe(V)O(4)(3-)) ions were correlated with thermodynamic reduction potentials to understand the reaction mechanisms. A linear relationship was found between log k and 1-e(-) reduction potentials for iodide, cyanides, and superoxide while oxy-compounds of nitrogen, sulfur, selenium, and arsenic demonstrated a linear relationship for 2-e(-) reduction potentials. The estimated limits for the reduction potentials of the couple are E(o)(Fe(VI)/Fe(V)) >or= 0.76 V and E(o)(Fe(VI)/Fe(IV)) >or= -0.18 V. Conclusions drawn from the correlations are consistent with the mechanisms postulated from stoichiometries, intermediates, and products of the reactions. Implication of the kinetic results in treatment using ferrate(VI) is briefly discussed.

Authors+Show Affiliations

Chemistry Department, Florida Institute of Technology, Melbourne, Florida 32901, USA. vsharma@fit.edu

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20527775

Citation

Sharma, Virender K.. "Oxidation of Inorganic Compounds By Ferrate(VI) and Ferrate(V): One-electron and Two-electron Transfer Steps." Environmental Science & Technology, vol. 44, no. 13, 2010, pp. 5148-52.
Sharma VK. Oxidation of inorganic compounds by Ferrate(VI) and Ferrate(V): one-electron and two-electron transfer steps. Environ Sci Technol. 2010;44(13):5148-52.
Sharma, V. K. (2010). Oxidation of inorganic compounds by Ferrate(VI) and Ferrate(V): one-electron and two-electron transfer steps. Environmental Science & Technology, 44(13), 5148-52. https://doi.org/10.1021/es1005187
Sharma VK. Oxidation of Inorganic Compounds By Ferrate(VI) and Ferrate(V): One-electron and Two-electron Transfer Steps. Environ Sci Technol. 2010 Jul 1;44(13):5148-52. PubMed PMID: 20527775.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Oxidation of inorganic compounds by Ferrate(VI) and Ferrate(V): one-electron and two-electron transfer steps. A1 - Sharma,Virender K, PY - 2010/6/10/entrez PY - 2010/6/10/pubmed PY - 2010/9/14/medline SP - 5148 EP - 52 JF - Environmental science & technology JO - Environ Sci Technol VL - 44 IS - 13 N2 - Ferrate(VI) (Fe(VI)O(4)(-), Fe(VI)) and ferrate(V) (Fe(V)O(4)(3-), Fe(V)) have a high oxidizing power and upon decomposition form a nontoxic byproduct, Fe(III), which makes them environmentally friendly oxidants in water and wastewater treatment. The kinetics of the reaction between Fe(VI) and I(-) was determined using a stopped-flow technique. The second-order rate constants (k, M(-1) s(-1)) for the oxidation of I(-) and other inorganic compounds by protonated ferrate(VI) (HFe(VI)O(4)(-)) and ferrate(V) (Fe(V)O(4)(3-)) ions were correlated with thermodynamic reduction potentials to understand the reaction mechanisms. A linear relationship was found between log k and 1-e(-) reduction potentials for iodide, cyanides, and superoxide while oxy-compounds of nitrogen, sulfur, selenium, and arsenic demonstrated a linear relationship for 2-e(-) reduction potentials. The estimated limits for the reduction potentials of the couple are E(o)(Fe(VI)/Fe(V)) >or= 0.76 V and E(o)(Fe(VI)/Fe(IV)) >or= -0.18 V. Conclusions drawn from the correlations are consistent with the mechanisms postulated from stoichiometries, intermediates, and products of the reactions. Implication of the kinetic results in treatment using ferrate(VI) is briefly discussed. SN - 0013-936X UR - https://www.unboundmedicine.com/medline/citation/20527775/Oxidation_of_inorganic_compounds_by_Ferrate_VI__and_Ferrate_V_:_one_electron_and_two_electron_transfer_steps_ L2 - https://doi.org/10.1021/es1005187 DB - PRIME DP - Unbound Medicine ER -