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Structures and stabilities of Cd(II) and Cd(II)-phthalate complexes at the goethite/water interface
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
2005 (English)In: GEOCHIMICA ET COSMOCHIMICA ACTA, ISSN 0016-7037, Vol. 69, no 13, 3219-35 p.Article in journal (Refereed) Published
Abstract [en]

The complexation of Cd(II) and Cd(II)-phthalate at the goethite/water interface were investigated by EXAFS and IR spectroscopy, by batch adsorption experiments and by potentiometric titrations at 298.15 K. The EXAFS spectra showed Cd(II) to form only inner-sphere corner-sharing complexes with the goethite surface sites in the presence and absence of phthalate. EXAFS spectra also showed the presence of Cd(II)-chloride complexes in 0.1 mol/L NaCl. IR spectra also showed phthalate to form (1) an inner-sphere complex with adsorbed corner-sharing Cd(II) surface complexes in the pH 3.5 to 9.5 and (2) an outer-sphere complex with the same type of corner-sharing Cd(II) complex however at pH > 6, in addition to the inner- and outer-sphere complexes of phthalate reported in a previous study. The potentiometric titration and the batch adsorption data were used to constrain the formation constants of the different Cd(II)-phthalate surface complexes on the dominant {110} and the {001} planes of the goethite. The models were carried out with the Charge Distribution Multisite Complexation model coupled to the Three Plane Model and can predict the molecular-scale speciation of cadmium and phthalate in the presence of goethite. Cd(II) adsorption models calibrated on a 90 m2/g goethite also could accurately predict experimental data for a 37 m2/g goethite of slightly different basic charging properties.

Place, publisher, year, edition, pages
2005. Vol. 69, no 13, 3219-35 p.
Keyword [en]
BENZENECARBOXYLATE SURFACE COMPLEXATION, SOLID-SOLUTION INTERFACE, (ALPHA-FEOOH)/WATER INTERFACE, WATER INTERFACE, ALPHA-FEOOH; OXYHYDROXIDE MINERALS, IRON OXYHYDROXIDE, PROTON BINDING, ION ADSORPTION, FERRIC-OXIDE
Identifiers
URN: urn:nbn:se:umu:diva-13509DOI: doi:10.1016/j.gca.2004.12.013OAI: oai:DiVA.org:umu-13509DiVA: diva2:153180
Available from: 2007-05-10 Created: 2007-05-10 Last updated: 2011-01-12Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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