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Abstract:

Adsorption of methylphosphonic acid (MPA) onto goethite (α-FeOOH) was studied as a function of pH and the concentration of MPA in solution. In situ attenuated total reflectance-FTIR (ATR-FTIR) techniques were used to identify the type of surface complexes formed under each of the solution conditions used in the adsorption studies. Additionally, electrophoretic mobility measurements were performed in each of these systems. At low pH and high Γ, MPA was bound to the surface of goethite predominantly as a monodentate protonated species, while at high pH and low Γ the prevailing structure was that of a bridging bidentate complex. The change in denticity of the surface MPA under different solution conditions may explain the charge reversals shown in the electrophoretic mobility curves.

Registro:

Documento: Artículo
Título:Complexation of methylphosphonic acid with the surface of goethite particles in aqueous solution
Autor:Barja, B.C.; Tejedor-Tejedor, M.I.; Anderson, M.A.
Filiación:Water Chemistry Program, University of Wisconsin, 660 North Park Street, Madison, WI 53706, United States
INQUIMAE, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Palabras clave:Adsorption; Complexation; Composition effects; Electrophoresis; Fourier transform infrared spectroscopy; Organic acids; pH effects; Surface phenomena; Surface structure; Attenuated total reflection (ATR); Goethite; Methylphosphonic acid; Iron compounds
Año:1999
Volumen:15
Número:7
Página de inicio:2316
Página de fin:2321
DOI: http://dx.doi.org/10.1021/la980540y
Título revista:Langmuir
Título revista abreviado:Langmuir
ISSN:07437463
CODEN:LANGD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v15_n7_p2316_Barja

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Citas:

---------- APA ----------
Barja, B.C., Tejedor-Tejedor, M.I. & Anderson, M.A. (1999) . Complexation of methylphosphonic acid with the surface of goethite particles in aqueous solution. Langmuir, 15(7), 2316-2321.
http://dx.doi.org/10.1021/la980540y
---------- CHICAGO ----------
Barja, B.C., Tejedor-Tejedor, M.I., Anderson, M.A. "Complexation of methylphosphonic acid with the surface of goethite particles in aqueous solution" . Langmuir 15, no. 7 (1999) : 2316-2321.
http://dx.doi.org/10.1021/la980540y
---------- MLA ----------
Barja, B.C., Tejedor-Tejedor, M.I., Anderson, M.A. "Complexation of methylphosphonic acid with the surface of goethite particles in aqueous solution" . Langmuir, vol. 15, no. 7, 1999, pp. 2316-2321.
http://dx.doi.org/10.1021/la980540y
---------- VANCOUVER ----------
Barja, B.C., Tejedor-Tejedor, M.I., Anderson, M.A. Complexation of methylphosphonic acid with the surface of goethite particles in aqueous solution. Langmuir. 1999;15(7):2316-2321.
http://dx.doi.org/10.1021/la980540y