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Vanadate complexation to ferrihydrite: X-ray absorption spectroscopy and CD-MUSIC modelling

Larsson, Maja and Persson, Ingmar and Sjöstedt, Carin and Gustafsson, Jon Petter (2017). Vanadate complexation to ferrihydrite: X-ray absorption spectroscopy and CD-MUSIC modelling. Environmental Chemistry. 14, 141-150
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Official URL: http://www.publish.csiro.au/en/EN16174

Abstract

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.

Authors/Creators:Larsson, Maja and Persson, Ingmar and Sjöstedt, Carin and Gustafsson, Jon Petter
Title:Vanadate complexation to ferrihydrite: X-ray absorption spectroscopy and CD-MUSIC modelling
Year of publishing :2017
Volume:14
Page range:141-150
Number of Pages:10
Publisher:CSIRO publishing
ISSN:1448-2517
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:vanadium, bioavailability, pollution
Keywords:Vanadium, environmental chemistry, bioavailability, adsorption behaviour, iron oxides
URN:NBN:urn:nbn:se:slu:epsilon-e-4480
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4480
Additional ID:
Type of IDID
DOI10.1071/EN16174
Web of Science (WoS)000398536500002
ID Code:14712
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment

(NL, NJ) > Department of Molecular Sciences
Deposited By: SLUpub Connector
Deposited On:14 Nov 2017 08:11
Metadata Last Modified:14 Nov 2017 08:11

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