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31P solid-state nuclear magnetic resonance study of the sorption of phosphate onto gibbsite and kaolinite
La Trobe University.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.ORCID iD: 0000-0003-1067-7990
La Trobe University.
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2007 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 23, no 6, p. 3205-3213Article in journal (Refereed) Published
Abstract [en]

Sorption of phosphate onto gibbsite (Υ-Al(OH)3) and kaolinite has been studied by both macroscopic and 31P solid-state NMR measurements. Together these measurements indicate that phosphate is sorbed by a combination of surface complexation and surface precipitation with the relative amounts of these phases depending on pH and phosphate concentration. At low pH and high phosphate concentrations sorption is dominated by the presence of both amorphous and crystalline precipitate phases. The similarity between the single-pulse and CP/MAS NMR spectra suggests that the precipitate phases form a thin layer on the surface of the particles in close contact with protons from surface hydroxyl groups or coordinated water molecules. While the crystalline phase is only evident on samples below pH 7, amorphous AlPO4 was found at all pH and phosphate concentrations studied. As pH was increased the fraction of phosphate sorbed as an inner-sphere complex increased, becoming the dominant surface species by pH 8. Comparison of sorption and NMR results suggests that the inner-sphere complexes form by monodentate coordinat

Place, publisher, year, edition, pages
2007. Vol. 23, no 6, p. 3205-3213
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-10058DOI: 10.1021/la062765bISI: 000244650000041Scopus ID: 2-s2.0-33947387557Local ID: 8cfe3c40-e11b-11db-b0f8-000ea68e967bOAI: oai:DiVA.org:ltu-10058DiVA, id: diva2:982998
Note
Validerad; 2007; 20070402 (bajo)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Sandström, DanAntzutkin, Oleg

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