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Mineralogical Magazine; February 2008; v. 72; no. 1; p. 385-388; DOI: 10.1180/minmag.2008.072.1.385
© 2008 Mineralogical Society of Great Britain and Ireland
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Session 5: Contaminated environments, toxicology and human health

Adsorption studies of Mo and V onto ferrihydrite

L. Brinza1,*, L. G. Benning1 and P. J. Statham2

1 Earth and Biosphere Institute, School of Earth and Environment, University of Leeds, LS2 9JT, UK
2 National Oceanography Centre, Southampton SO14 3ZH, UK

* E-mail: l.brinza{at}earth.leeds.ac.uk

ABSTRACT

In this paper, the kinetics of Mo and V (100 µM) uptake on ferrihydrite (FHY) were evaluated in batch, mono-sorbate systems at pH between 4 and 9, and in bi-sorbate systems in the presence of P (100 µM) at pH 7. In the Mo and V single-sorbate experiments, 100% adsorption was observed at pH values below 6 and 8, respectively. Above the point of zero charge (PZC = 7.97) of FHY, the adsorption efficiency for Mo dropped dramatically (20% at pH 8) while V showed high uptake efficiencies even at pH 9 (60% efficiency). The results from the bi-sorbate experiments (Mo-P and V-P) showed that at pH 7, P out-competed (97%) Mo for binding sites on FHY, while in the V-P binary system only ~44% of the binding sites are occupied by P with the remaining sites being occupied by V.






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