Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite
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...
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todo:paper_0013936X_v26_n12_p2408_Stefan2023-10-03T14:11:38Z Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite Stefan, P. Marla Dos, S.A. Bernhard, W. Rene, G. ferric hydroxide hydrogen sulfide article chemical analysis chemical reaction kinetics lake oxidation ph water pollutant water treatment 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0013936X_v26_n12_p2408_Stefan |
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Universidad de Buenos Aires |
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I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
ferric hydroxide hydrogen sulfide article chemical analysis chemical reaction kinetics lake oxidation ph water pollutant water treatment |
| spellingShingle |
ferric hydroxide hydrogen sulfide article chemical analysis chemical reaction kinetics lake oxidation ph water pollutant water treatment Stefan, P. Marla Dos, S.A. Bernhard, W. Rene, G. Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite |
| topic_facet |
ferric hydroxide hydrogen sulfide article chemical analysis chemical reaction kinetics lake oxidation ph water pollutant water treatment |
| description |
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. |
| format |
JOUR |
| author |
Stefan, P. Marla Dos, S.A. Bernhard, W. Rene, G. |
| author_facet |
Stefan, P. Marla Dos, S.A. Bernhard, W. Rene, G. |
| author_sort |
Stefan, P. |
| title |
Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite |
| title_short |
Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite |
| title_full |
Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite |
| title_fullStr |
Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite |
| title_full_unstemmed |
Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Lepidocrocite |
| title_sort |
kinetics and mechanism of the reaction of hydrogen sulfide with lepidocrocite |
| url |
http://hdl.handle.net/20.500.12110/paper_0013936X_v26_n12_p2408_Stefan |
| work_keys_str_mv |
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