The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Per Persson. Photo.

Per Persson

Dean

Per Persson. Photo.

Structures and stabilities of Cd(II) and Cd(II)-phthalate complexes at the goethite/water interface

Author

  • J. F. Boily
  • S. Sjoberg
  • Per Persson

Summary, in English

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(IT) 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 fitration 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 m(2)/g goethite also could accurately predict experimental data for a 37 m(2)/g goethite of slightly different basic charging properties. Copyright (C) 2005 Elsevier Ltd.

Publishing year

2005

Language

English

Pages

3219-3235

Publication/Series

Geochimica et Cosmochimica Acta

Volume

69

Document type

Journal article

Publisher

Elsevier

Topic

  • Earth and Related Environmental Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 0016-7037