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Structure and bonding of orthophosphate ions at the iron oxide aqueous interface
Umeå Universitet.ORCID iD: 0000-0001-9172-3068
Umeå Universitet.ORCID iD: 0000-0002-2851-9862
Umeå Universitet.
1996 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 177, no 1, p. 263-275Article in journal (Refereed) Published
Abstract [en]

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 PO4unit of C3v, C2v, and C3v, 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.

Place, publisher, year, edition, pages
1996. Vol. 177, no 1, p. 263-275
Keywords [en]
iron oxide-aqueous interface, orthophosphate ions, adsorption, diffuse reflectance, Fourier transform infrared spectroscopy
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:miun:diva-34495DOI: 10.1006/jcis.1996.0030ISI: A1996TN49100030OAI: oai:DiVA.org:miun-34495DiVA, id: diva2:1250837
Available from: 2018-09-25 Created: 2018-09-25 Last updated: 2018-09-25Bibliographically approved

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Nilsson, Nils

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