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

Author:
  • Per Persson
  • N. Nilsson
  • S. Sjoberg
Publishing year: 1996
Language: English
Pages: 263-275
Publication/Series: Journal of Colloid and Interface Science
Volume: 177
Document type: Journal article
Publisher: Elsevier
Additional info: 1

Abstract 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.

Keywords

  • Earth and Related Environmental Sciences

Other

Published
  • ISSN: 1095-7103
Per Persson
E-mail: per [dot] persson [at] biol [dot] lu [dot] se

Professor

MEMEG

+46 46 222 17 96

+46 70 266 38 79

E-C350

50

Professor

Centre for Environmental and Climate Research (CEC)

+46 46 222 17 96

+46 70 266 38 79

D350

Ekologihuset, Sölvegatan 37, Lund

50