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Per Persson. Photo.

Per Persson

Director

Per Persson. Photo.

Structure and bonding of orthophosphate ions at the iron oxide aqueous interface

Author

  • Per Persson
  • N. Nilsson
  • S. Sjoberg

Summary, in English

The surface speciation of orthophosphate ions on goethite has been studied as a function of pH, time, total phosphate concentration, and ionic medium by means of diffuse reflectance FTIR spectroscopy. The samples were prepared in accordance with a distribution diagram of surface species as calculated from thermodynamic data. In agreement with the thermodynamic model three dominating surface complexes could be distinguished with IR spectroscopy, and the relative distribution of the species was shown to be primarily a function of pH. The IR characteristics of the individual surface complexes were indicative of molecular symmetries of the PO4 unit of C-3v, C-2v, and C-3v, respectively. This was concluded to be incompatible with the bidentate, bridging structural model previously suggested. Instead, the IR data are in good agreement with a monodentate coordination of phosphate to the surfaces, where the three surface complexes only differ in the degree of protonation. A comparison between the adsorption behavior of phosphate on goethite and hematite was also made. Here the importance of the aqueous stability of the adsorbent on the adsorption mechanism was shown. (C) 1996 Academic Press, Inc.

Publishing year

1996

Language

English

Pages

263-275

Publication/Series

Journal of Colloid and Interface Science

Volume

177

Document type

Journal article

Publisher

Elsevier

Topic

  • Earth and Related Environmental Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 1095-7103