Oxygen Oxidation of Ferrous Ions Induced by Chelation

Kurimura, Yoshimi; Ochiai, Ryoji; Matsuura, Niro

doi:10.1246/bcsj.41.2234

Cited by 93 publications

(49 citation statements)

References 6 publications

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“…In both cases, the chemical reaction of Fe" -EDTA and 0? is fast, as expected (52 Fig. 1 (converting f to [Fe,]).…”

Section: Photochen7iccil Rlissolirtiorzsupporting

confidence: 80%

Photodissolution of iron oxides. IV. A comparative study on the photodissolution of hematite, magnetite, and maghemite in EDTA media

Litter¹,

Blesa²

1992

Can. J. Chem.

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The thermal and 254-nm photochemical dissolution reactions of magnetite (Fe3O4), maghemite (γ-Fe2O3), and hematite (α-Fe2O3) suspended in EDTA aqueous solutions were compared. γ-Fe2O3 and Fe3O4 are thermally and photochemically more reactive than α-Fe2O3. Both thermal and photochemical dissolution reactions are governed by an initiation step, which involves the production of FeIIaq, and a subsequent thermal reaction of these ions with the solid, to produce FeIIIaq. The initiation step under UV irradiation involves the photoreduction of surface >FeIII – EDTA complexes to yield FeIIaq and the photooxidation of adsorbed EDTA to yield CH2O and other oxidation products. After FeIII – EDTA complexes build up in solution through the following step, homogeneous photolysis is the main source of FeII and CH2O. Oxides with spinel type structure are characterized by faster rates in the two processes, and O2 may inhibit the dissolution processes by changing the stoichiometry of the initiation step to that of the autooxidation of EDTA. The relative importance of autooxidation and photodissolution depends on the nature of the oxide and the experimental conditions. Photooxidation reaction rates parallel those of the photodissolution initiation steps, and long-term stability towards photocorrosion (dissolution) implies low photocatalytic activity for the oxidation of EDTA. The set of differential equations describing all the reaction rates is discussed and applied to the different cases.

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“…In both cases, the chemical reaction of Fe" -EDTA and 0? is fast, as expected (52 Fig. 1 (converting f to [Fe,]).…”

Section: Photochen7iccil Rlissolirtiorzsupporting

confidence: 80%

Photodissolution of iron oxides. IV. A comparative study on the photodissolution of hematite, magnetite, and maghemite in EDTA media

Litter¹,

Blesa²

1992

Can. J. Chem.

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“…Model results suggest that the loss of Fe(II)L 2 from the system proceeds at a rate of 3 Â 10 À3 s À1 , which may be due to O 2 -mediated oxidation with an apparent rate constant of k app = 12 L mol À1 s À1 , through rate limiting dissociation to form Fe(II)L 1 or perhaps a combination of these processes. Kurimura et al (1968) has reported an O 2 -mediated oxidation rate for the Fe(II)-DTPA complex of 7.0 L mol À1 s À1 and similarly Santana-Casiano et al (2004) have reported that Fe(II)-phthalate complexes are not readily oxidized by O 2 (k ox = (1 ± 1) Â 10 À3 L mol À1 s À1 ).…”

Section: One-ligand Class Modelmentioning

confidence: 98%

Impact of natural organic matter on H2O2-mediated oxidation of Fe(II) in a simulated freshwater system

Miller

Rose

Waite

2009

Geochimica et Cosmochimica Acta

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“…This experiment was exactly like experiment 3A except Fe3+BPDS replaced the 4'FeEDTA. The measurement of reduction of FeEDTA by trapping Fe2+ as FeBPDS3 necessarily underestimates the rate of reduction because EDTA catalyzes oxidation of Fe2- (21). Use of Fe+0-BPDS as the source of Fe?+ precludes the oxidative back reaction.…”

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confidence: 99%