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Abstract:

The kinetics of reductive dissolution of Mn(IV) oxides by hydrogen sulfide has been investigated. The concentration of total H2S(aq) in the reaction system ranged between 1.0 and 4.0 mM and was adjusted keeping a constant partial pressure of the gaseous H2S phase above the solution. The reaction products were identified as Mn(II), sulfate, elemental sulfur, and small amounts of thiosulfate. The distribution of products changes with pH; sulfate is the main product at low pH values while elemental sulfur is the main product at near neutral pH values. The rate constant decreased with an increase in pH. Experimental data indicate that the rate law is first order on both the surface sites and the H2S concentration. The reaction proceeds via the formation of two different inner-sphere surface complexes ≡MNIVS- and ≡MNIVSH and their further oxidation to products. A mechanism in agreement with the experimental results is proposed.

Registro:

Documento: Artículo
Título:Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
Autor:Herszage, J.; Dos Santos Afonso, M.
Filiación:INQUIMAE, Dept. de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Univ. Pabellón II, C1428EHA Buenos Aires, Argentina
Palabras clave:Inner sphere surface complexes; Reductive dissolution; Complexation; Dissolution; Hydrogen sulfide; Oxidation; Partial pressure; pH effects; Rate constants; Manganese compounds
Año:2003
Volumen:19
Número:23
Página de inicio:9684
Página de fin:9692
DOI: http://dx.doi.org/10.1021/la034016p
Título revista:Langmuir
Título revista abreviado:Langmuir
ISSN:07437463
CODEN:LANGD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v19_n23_p9684_Herszage

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Citas:

---------- APA ----------
Herszage, J. & Dos Santos Afonso, M. (2003) . Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions. Langmuir, 19(23), 9684-9692.
http://dx.doi.org/10.1021/la034016p
---------- CHICAGO ----------
Herszage, J., Dos Santos Afonso, M. "Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions" . Langmuir 19, no. 23 (2003) : 9684-9692.
http://dx.doi.org/10.1021/la034016p
---------- MLA ----------
Herszage, J., Dos Santos Afonso, M. "Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions" . Langmuir, vol. 19, no. 23, 2003, pp. 9684-9692.
http://dx.doi.org/10.1021/la034016p
---------- VANCOUVER ----------
Herszage, J., Dos Santos Afonso, M. Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions. Langmuir. 2003;19(23):9684-9692.
http://dx.doi.org/10.1021/la034016p