Reductive dissolution of iron(III) (hydr)oxides by hydrogen sulfide
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...
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| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
1992
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| Acceso en línea: | Registro en Scopus Handle Registro en la Biblioteca Digital |
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| LEADER | 02914caa a22003017a 4500 | ||
|---|---|---|---|
| 001 | PAPER-295 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518202940.0 | ||
| 008 | 140217s1992 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-0001170324 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Dos Santos Afonso, M. | |
| 245 | 1 | 0 | |a Reductive dissolution of iron(III) (hydr)oxides by hydrogen sulfide |
| 260 | |c 1992 | ||
| 270 | 1 | 0 | |m Dos Santos Afonso, M.; Depto de Química Inorgánica, Analítica y Química Física, Ciudad Universitaria Pabellón II, 1428 Buenos Aires, Argentina |
| 506 | |2 openaire |e Política editorial | ||
| 520 | 3 | |a 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. © 1992 American Chemical Society. |l eng | |
| 593 | |a Swiss Federal Institute for Water Resources and Water Pollution Control (EAWAG), Swiss Federal Institute of Technology (ETH), Duebendorf, Switzerland | ||
| 593 | |a Depto de Química Inorgánica, Analítica y Química Física, Ciudad Universitaria Pabellón II, 1428 Buenos Aires, Argentina | ||
| 700 | 1 | |a Stumm, W. | |
| 773 | 0 | |d 1992 |g v. 8 |h pp. 1671-1675 |k n. 6 |x 07437463 |t Langmuir | |
| 856 | 4 | 1 | |u http://www.scopus.com/inward/record.url?eid=2-s2.0-0001170324&partnerID=40&md5=efc95789be227a160343f449f6987ea4 |y Registro en Scopus |
| 856 | 4 | 0 | |u https://hdl.handle.net/20.500.12110/paper_07437463_v8_n6_p1671_DosSantosAfonso |y Handle |
| 856 | 4 | 0 | |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v8_n6_p1671_DosSantosAfonso |y Registro en la Biblioteca Digital |
| 961 | |a paper_07437463_v8_n6_p1671_DosSantosAfonso |b paper |c PE | ||
| 962 | |a info:eu-repo/semantics/article |a info:ar-repo/semantics/artículo |b info:eu-repo/semantics/publishedVersion | ||
| 963 | |a VARI | ||
| 999 | |c 61248 | ||