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Reductive dissolution of iron(III) (hydr)oxides by hydrogen sulfide
Abstract
The reductive dissolution of hematite by H2S was investigated under conditions of constant partial pressure of H2S (10-4 to 10-2 atm), pH = 3-7 and 25°C, and under conditions where the solubility product of iron sulfide is not exceeded. The reaction proceeds by an initial (relatively fast) formation of ≡FeS- and ≡FeSH surface complexes; subsequently, electron transfer and detachment of Fe(II) from the oxide surface occur. The rate law for the dissolution can be interpreted by assuming a surface-controlled reaction depending on the surface concentration of the surface complexes ≡FeS- and ≡FeSH: Rt = ke{≡FeS-} + ke′{≡FeSH} where {≡FeS-} and {≡FeSH} are surface concentrations in mol·m-2. The experimental data are compatible with the constants ke = 30 h-1 and ke′ = 400 h-1 and surface complex formation constants for ≡FeS- (≡FeOH + H2S(g) ⇄ ≡FeS- + H+ + H2O) and ≡FeSH (≡FeOH + H2S(g) ⇄ ≡FeSH + H2O) of log Ks = -2.70 and 2.82, respectively. Preliminary experiments with lepidocrocite and goethite give results on the reaction rates that show the same kind of dependence on solution variables as those with α-Fe2O3 and are compatible with the mechanism proposed here.
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Metadata
- Authors
- Dos Santos Afonso, M., & Stumm, W.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 1992-06
- Volume
- 8
- Issue
- 6
- Pages
- 1671-1675
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2036100486
- Cited by
- 359
- References
- 0
- FWCI
- 10.20
- Type
- journal article
- Language
- en
- Open access
- closed
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