title: Ferrates(FeVI, FeV, and FeIV) oxidation of iodide: Formation of triiodide.
abstract: 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) (Fe(VI)O4(2-), Fe(VI)) was determined as a function of pH. The second-order rate constants (k, M(-1) s(-1)) decreased from 3.9 × 10(4) M(-1) s(-1) at pH 5.0 to 1.2 × 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) (HFe(VI)O4(-)) with I(-). In excess I(-) concentration, triiodide (I3(-)) was formed and the stoichiometry of ∼1:1 ([Fe(VI)]:[I3(-)]) was found in both acidic and basic pH. Ferrate(V) (Fe(V)O4(3-), Fe(V)) and ferrate(IV) (Fe(VI)O4(4-), Fe(IV)) also showed the formation of I3(-) in presence of excess I(-). A mechanism of the formation of I3(-) is proposed, which is consistent with the observed stoichiometry of 1:1. The oxidative treatment of I(-) in water will be rapid (t1/2 = 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.
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Departments of Physical Chemistry and Experimental Physics, Faculty of Science, Palacký University, Olomouc, Czech Republic.
authors.forename: Radina P
authors.initials: RP
authors.lastname: Kralchevska
authors.affiliation: Department of Occupational and Environmental Health, School of Public Health, Texas A&M University, College Station, TX 77843, USA. Electronic address: vsharma@sph.tamhsc.edu.
authors.forename: Virender K
authors.initials: VK
authors.lastname: Sharma
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Departments of Physical Chemistry and Experimental Physics, Faculty of Science, Palacký University, Olomouc, Czech Republic.
authors.forename: Libor
authors.initials: L
authors.lastname: Machala
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Departments of Physical Chemistry and Experimental Physics, Faculty of Science, Palacký University, Olomouc, Czech Republic.
authors.forename: Radek
authors.initials: R
authors.lastname: Zboril
mesh_terms: D004202:Disinfectants; D054879:Halogenation; D007454:Iodides / Q000032:analysis* / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D004202:Disinfectants; D007454:Iodides; D016877:Oxidants; D014874:Water Pollutants, Chemical; C017311:ferrate ion; D007501:Iron
keywords: Disinfection by-products; Ferrate; Iodide; Mechanism; Oxidation