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Adsorption studies of Mo and Vonto ferrihydrite

Published online by Cambridge University Press:  05 July 2018

L. Brinza ,
L. G. Benning  and
P. J. Statham
L. Brinza*
Affiliation:
Earth and Biosphere Institute, School of Earth and Environment, University of Leeds, LS2 9JT, UK
L. G. Benning
Affiliation:
Earth and Biosphere Institute, School of Earth and Environment, University of Leeds, LS2 9JT, UK
P. J. Statham
Affiliation:
National Oceanography Centre, Southampton SO14 3ZH, UK
*
*E-mail: [email protected]
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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.

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 385 - 388
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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