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TiO2 anatase nanotubes for the purification of uranium,arsenic and lead containing water: an X-ray Photoelectron Spectroscopy study

Published online by Cambridge University Press:  31 January 2011

Marco Bonato ,
Kristin Vala Ragnarsdottir  and
Geoffrey C. Allen
Marco Bonato
Affiliation:
phxmb@bristol.ac.uk, University of Bristol, Interface Analysis Centre, 121 St Michael's Hill, Bristol, BS2 8BS, United Kingdom
Kristin Vala Ragnarsdottir
Affiliation:
vala@hi.is, University of Iceland, Institute of Earth Science, School of Engineering and Natural Sciences, Reykjavik, Iceland
Geoffrey C. Allen
Affiliation:
g.c.allen@bris.ac.uk, University of Bristol, Interface Analysis Centre, Bristol, United Kingdom
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Abstract

TiO2 anatase nanotubes synthesised via anodic oxidation were used as adsorbent for the uptake of U and Pb from aqueous solution and the photoremoval of As(III). An X-ray photoelectron spectroscopy study of the sorbent medium surface revealed a high adsorption of U and Pb at pH 8. The adsorption of the uranyl ion was enhanced in an anoxy (N2) atmosphere, because this prevents the formation of very stable carbonyl complexes. As(III) was adsorbed on TiO2 but in the presence of O2 and UV light was oxidized to As(V). XPS analysis revealed that in the pH range 3-9 As(V) was always the major species detected at the surface of the titania photocatalyst.

Keywords

surface chemistryabsorptionx-ray photoelectron spectroscopy (XPS)

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