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Abstract:

There are four general pathways of dissolution of reducible metal oxides in acidic aqueous solution: proton-assisted (acid), ligand-promoted acid, reductive, and ligand-promoted reductive dissolution. The presence and reactivity toward the surface of protons, chelating ligands, and reductants dictate the mechanism(s) controlling the dissolution. For the massive reductive dissolution of magnetic by ascorbic acid, the experimental rate law R = k[HA-]1 2[H+] suggests the involvement of surface ≡FeIII A- complexes. Adsorption isotherms of ascorbic acid onto hematite at pH 3 and 25°C yield a Langmuir-type surface complexation constant Ks = (9.57 × 108 M-1). Slow dissolution follows with an empirical rate law R = kobs(≡FeIIIA). It is concluded that the formation and kinetic reactivity of surface complexes determine the rate of dissolution. Dehydroascorbic acid also dissolves magnetite, but at slower rates. Oxalate accelerates the reductive dissolution of hematite by ascorbate even though it competes with ascorbate for surface sites; enhanced detachment of ≡FeII surface species by oxalate complexation may be involved. Autoacceleration of the reductive dissolution by dissolved FeII-carboxylate complexes is observed in EDTA/ascorbic acid mixtures; the rate reaches a maximum at intermediate [EDTA] values, where synergistic effects between EDTA and FeII-EDTA complexes are important. Autoacceleration may also operate in oxalate solutions. © 1990.

Registro:

Documento: Artículo
Título:The reductive dissolution of iron oxides by ascorbate. The role of carboxylate anions in accelerating reductive dissolution
Autor:Dos Santos Afonso, M.; Morando, P.J.; Blesa, M.A.; Banwart, S.; Stumm, W.
Filiación:Departamento de Química Inorgánica, Analitica y Quimica Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, Núñez, Buenos Aires, Argentina
Institute for Water Resources and Water Pollution Control (EAWAG), Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
Año:1990
Volumen:138
Número:1
Página de inicio:74
Página de fin:82
DOI: http://dx.doi.org/10.1016/0021-9797(90)90181-M
Título revista:Journal of Colloid And Interface Science
Título revista abreviado:J. Colloid Interface Sci.
ISSN:00219797
CODEN:JCISA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v138_n1_p74_DosSantosAfonso

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Citas:

---------- APA ----------
Dos Santos Afonso, M., Morando, P.J., Blesa, M.A., Banwart, S. & Stumm, W. (1990) . The reductive dissolution of iron oxides by ascorbate. The role of carboxylate anions in accelerating reductive dissolution. Journal of Colloid And Interface Science, 138(1), 74-82.
http://dx.doi.org/10.1016/0021-9797(90)90181-M
---------- CHICAGO ----------
Dos Santos Afonso, M., Morando, P.J., Blesa, M.A., Banwart, S., Stumm, W. "The reductive dissolution of iron oxides by ascorbate. The role of carboxylate anions in accelerating reductive dissolution" . Journal of Colloid And Interface Science 138, no. 1 (1990) : 74-82.
http://dx.doi.org/10.1016/0021-9797(90)90181-M
---------- MLA ----------
Dos Santos Afonso, M., Morando, P.J., Blesa, M.A., Banwart, S., Stumm, W. "The reductive dissolution of iron oxides by ascorbate. The role of carboxylate anions in accelerating reductive dissolution" . Journal of Colloid And Interface Science, vol. 138, no. 1, 1990, pp. 74-82.
http://dx.doi.org/10.1016/0021-9797(90)90181-M
---------- VANCOUVER ----------
Dos Santos Afonso, M., Morando, P.J., Blesa, M.A., Banwart, S., Stumm, W. The reductive dissolution of iron oxides by ascorbate. The role of carboxylate anions in accelerating reductive dissolution. J. Colloid Interface Sci. 1990;138(1):74-82.
http://dx.doi.org/10.1016/0021-9797(90)90181-M