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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Autores principales: Herszage, J., Dos Santos Afonso, M.
Formato: JOUR
Materias:
Inner sphere surface complexes
Reductive dissolution
Complexation
Dissolution
Hydrogen sulfide
Oxidation
Partial pressure
pH effects
Rate constants
Manganese compounds
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07437463_v19_n23_p9684_Herszage
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_07437463_v19_n23_p9684_Herszage
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spelling todo:paper_07437463_v19_n23_p9684_Herszage2023-10-03T15:38:35Z Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions Herszage, J. Dos Santos Afonso, M. Inner sphere surface complexes Reductive dissolution Complexation Dissolution Hydrogen sulfide Oxidation Partial pressure pH effects Rate constants Manganese compounds 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. Fil:Herszage, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07437463_v19_n23_p9684_Herszage
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Inner sphere surface complexes
Reductive dissolution
Complexation
Dissolution
Hydrogen sulfide
Oxidation
Partial pressure
pH effects
Rate constants
Manganese compounds
spellingShingle Inner sphere surface complexes
Reductive dissolution
Complexation
Dissolution
Hydrogen sulfide
Oxidation
Partial pressure
pH effects
Rate constants
Manganese compounds
Herszage, J.
Dos Santos Afonso, M.
Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
topic_facet Inner sphere surface complexes
Reductive dissolution
Complexation
Dissolution
Hydrogen sulfide
Oxidation
Partial pressure
pH effects
Rate constants
Manganese compounds
description 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.
format JOUR
author Herszage, J.
Dos Santos Afonso, M.
author_facet Herszage, J.
Dos Santos Afonso, M.
author_sort Herszage, J.
title Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
title_short Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
title_full Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
title_fullStr Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
title_full_unstemmed Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
title_sort mechanism of hydrogen sulfide oxidation by manganese(iv) oxide in aqueous solutions
url http://hdl.handle.net/20.500.12110/paper_07437463_v19_n23_p9684_Herszage
work_keys_str_mv AT herszagej mechanismofhydrogensulfideoxidationbymanganeseivoxideinaqueoussolutions
AT dossantosafonsom mechanismofhydrogensulfideoxidationbymanganeseivoxideinaqueoussolutions
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