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Abstract:

The initial reaction between hydrogen sulfide and the surface of lepidocrocite was studied in the pH range between 4 and 8.6 by monitoring the change of the emf of a pH2S sensor. The rate of H2S oxidation is pseudo first order with respect to H2S and shows a strong pH dependence with a maximum at pH 7. Two rate laws were derived: R(5<pH<6) = ka[H+]-2[H2S]tot,A and R(7<PH<8.6) = Kb[H+]1[H2S]totA with ka = 1.5 × 10-13 M2 min-1 and kb = 2 X 106 M-1 min-1. The pH maximum of the reaction rate can be explained by using a surface speciation model suggested for the reductive dissolution of hematite by H2S (1): The oxidation rate of H2S is proportional to the concentration of inner-sphere surface complexes of HS- formed with either the neutral ferric oxide surface sites (>FeOH) or the protonated ferric oxide surface sites (>FeOH2+). The amount of protons consumed per mole of H2Stot suggests that polysulfides and elemental sulfur are the initial products formed during the experiments. © 1992, American Chemical Society. All rights reserved.

Registro:

Documento: Artículo
Título:Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite
Autor:Stefan, P.; Marla Dos, S.A.; Bernhard, W.; Rene, G.
Filiación:CH-6047 Kastanienbaum, Depto de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria Pabellón II, Buenos Aires, Argentina 1428, United States
Palabras clave:ferric hydroxide; hydrogen sulfide; article; chemical analysis; chemical reaction kinetics; lake; oxidation; ph; water pollutant; water treatment
Año:1992
Volumen:26
Número:12
Página de inicio:2408
Página de fin:2413
DOI: http://dx.doi.org/10.1021/es00036a011
Título revista:Environmental Science and Technology
Título revista abreviado:Environ. Sci. Technol.
ISSN:0013936X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0013936X_v26_n12_p2408_Stefan

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Citas:

---------- APA ----------
Stefan, P., Marla Dos, S.A., Bernhard, W. & Rene, G. (1992) . Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite. Environmental Science and Technology, 26(12), 2408-2413.
http://dx.doi.org/10.1021/es00036a011
---------- CHICAGO ----------
Stefan, P., Marla Dos, S.A., Bernhard, W., Rene, G. "Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite" . Environmental Science and Technology 26, no. 12 (1992) : 2408-2413.
http://dx.doi.org/10.1021/es00036a011
---------- MLA ----------
Stefan, P., Marla Dos, S.A., Bernhard, W., Rene, G. "Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite" . Environmental Science and Technology, vol. 26, no. 12, 1992, pp. 2408-2413.
http://dx.doi.org/10.1021/es00036a011
---------- VANCOUVER ----------
Stefan, P., Marla Dos, S.A., Bernhard, W., Rene, G. Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite. Environ. Sci. Technol. 1992;26(12):2408-2413.
http://dx.doi.org/10.1021/es00036a011