NDLI: Removal of Uranium(VI), Lead(II) at the Surface of TiO$_{2}$ Nanotubes Studied by X-Ray Photoelectron Spectroscopy

Content Provider	Springer Nature Link
Author	Bonato, M. Ragnarsdottir, K. V. Allen, G. C.
Copyright Year	2012
Abstract	A thin film of well-ordered anatase TiO$_{2}$ nanotubes prepared by anodic oxidation of titanium metal were synthesised and used as adsorbent medium for the purification of water from aqueous uranium and lead. The amount of subtracted metal ions was quantified by using X-ray photoelectron spectroscopy at the surface of the reacted TiO$_{2}$ surface. Batch experiments for the sorption of U and Pb at the surface of the titania substrate were carried out in separated solution equilibrated with air of uranyl acetate and lead nitrate, in the pH range 3–9. For uranium, the experiments were also repeated in anoxic (N$_{2}$) atmosphere. The amount of metal ions adsorbed onto the titania medium was quantified by measurements of the surface coverage expressed in atomic percent, by recording high-resolution XPS spectra in the Ti2p, U4f and Pb4f photoelectron regions. Adsorption of the uranyl species in air atmosphere as a function of pH showed an adsorption edge near pH 4 with a maximum at pH 7. At higher pH the presence of very stable uranyl–carbonate complexes prevented any further adsorption. Further adsorption increased until pH 8.5 was obtained when the uranyl solution was purged from dissolved CO$_{2}$. Lead ion showed a sorption edge at pH 6, with a maximum uptake at pH 8. The results showed that the uptake of uranium and lead on the selected titania medium is remarkably sensitive to the solution pH. This study demonstrates the reliability of this type of material for treating water polluted with heavy metals as well as leachates from radioactive nuclear wastes.
Starting Page	3845
Ending Page	3857
Page Count	13
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	223
Issue Number	7
e-ISSN	15732932
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-03-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TiO$_{2}$ nanotubes Water purification XPS Uranium Lead Hydrogeology Environment Climate Change Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Soil Science & Conservation Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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