Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions

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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 pro...

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Detalles Bibliográficos
Autor principal: Herszage, J.
Otros Autores: Dos Santos Afonso, M.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2003
Acceso en línea:Registro en Scopus
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100 1 |a Herszage, J. 
245 1 0 |a Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions 
260 |c 2003 
270 1 0 |m Dos Santos Afonso, M.; INQUIMAE, Facultad de Cie. Exactas y Nat., Univ. de Buenos Aires, Ciudad Universitaria Pabellon II, C1428EHA Buenos Aires, Argentina 
506 |2 openaire  |e Política editorial 
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520 3 |a 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.  |l eng 
593 |a 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 
690 1 0 |a INNER SPHERE SURFACE COMPLEXES 
690 1 0 |a REDUCTIVE DISSOLUTION 
690 1 0 |a COMPLEXATION 
690 1 0 |a DISSOLUTION 
690 1 0 |a HYDROGEN SULFIDE 
690 1 0 |a OXIDATION 
690 1 0 |a PARTIAL PRESSURE 
690 1 0 |a PH EFFECTS 
690 1 0 |a RATE CONSTANTS 
690 1 0 |a MANGANESE COMPOUNDS 
700 1 |a Dos Santos Afonso, M. 
773 0 |d 2003  |g v. 19  |h pp. 9684-9692  |k n. 23  |p Langmuir  |x 07437463  |t Langmuir 
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