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Vanadate complexation to ferrihydrite: X-ray absorption spectroscopy and CD-MUSIC modelling
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. Swedish University of Agricultural Sciences, Sweden.ORCID iD: 0000-0001-8771-7941
2017 (English)In: Environmental Chemistry, ISSN 1448-2517, E-ISSN 1449-8979, Vol. 14, no 3, 141-150 p.Article in journal (Refereed) Published
Abstract [en]

The mobility of vanadium in the environment is influenced by sorption to metal (hydr)oxides, especially those containing iron. The aim of this study is to understand the adsorption behaviour of vanadium on poorly ordered (two-line) ferrihydrite (Fh). A further objective was to determine the binding mechanism of vanadate(V) to ferrihydrite surfaces in aqueous suspension to constrain the CD-MUSIC surface complexation model. Vanadium adsorption to ferrihydrite was evaluated by batch experiments which included series with different Fh-to-V ratios and pH values. Vanadate(V) adsorption was also evaluated in the presence of phosphate to compete with vanadate(V) for the available surface sites on ferrihydrite. In agreement with earlier studies, vanadate(V) was strongly adsorbed to ferrihydrite and the adsorption increased with decreasing pH. In the presence of phosphate, less vanadate(V) was adsorbed. Analysis by X-ray absorption near-edge structure spectroscopy revealed that the adsorbed vanadium was tetrahedral vanadate(V), VO4, regardless of whether vanadate(V) or vanadyl(IV) was added to the system. Spectra collected by extended X-ray absorption fine structure spectroscopy showed that vanadate(V) is bound primarily as an edge-sharing bidentate complex with VFe distances around 2.8 angstrom. Based on this information, a surface complexation model was set up in which three bidentate vanadate(V) complexes with different degrees of protonation were included. The model provided a satisfactory description of vanadate(V) adsorption over most of the pH and concentration ranges studied, also in the presence of competing phosphate ions.

Place, publisher, year, edition, pages
CSIRO Publishing, 2017. Vol. 14, no 3, 141-150 p.
National Category
Environmental Sciences Chemical Sciences
Research subject
Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-206307DOI: 10.1071/EN16174ISI: 000398536500002Scopus ID: 2-s2.0-85016749607OAI: oai:DiVA.org:kth-206307DiVA: diva2:1093383
Note

QC 20170505

Available from: 2017-05-05 Created: 2017-05-05 Last updated: 2017-06-28Bibliographically approved

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