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Uranium sorption on various forms of titanium dioxide--influence of surface area, surface charge, and impurities. | LitMetric

AI Article Synopsis

  • Titanium dioxide (TiO(2)) is commonly used in studies of how environmental contaminants like uranium interact with surfaces, but research on its different forms and their sorption properties is limited.
  • The study specifically examined how factors such as surface area, charge, and impurities affect uranium sorption on various well-characterized TiO(2) surfaces, finding significant differences based mainly on their crystallographic forms and morphologies.
  • Advanced techniques like ATR FT-IR spectroscopy indicated that despite variations in the TiO(2) samples, the surface species and complexes formed during U(VI) sorption were quite similar, highlighting the importance of material properties over impurities.

Article Abstract

Titanium dioxide (TiO(2)) has often served as a model substrate for experimental sorption studies of environmental contaminants. However, various forms of Ti-oxide have been used, and the different sorption properties of these materials have not been thoroughly studied. We investigated uranium sorption on some thoroughly characterized TiO(2) surfaces with particular attention to the influence of surface area, surface charge, and impurities. The sorption of U(VI) differed significantly between samples. Aggressive pretreatment of one material to remove impurities significantly altered the isoelectric point, determined by an electroacoustic method, but did not significantly impact U sorption. Differences in sorption properties between the various TiO(2) materials were related to the crystallographic form, morphology, surface area, and grain size, rather than to surface impurities or surface charge. In-situ attenuated total reflection Fourier-transform infrared (ATR FT-IR) spectroscopic studies showed that the spectra of the surface species of the TiO(2) samples are not significantly different, suggesting the formation of similar surface complexes. The data provide insights into the effect of different source materials and surface properties on radionuclide sorption.

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Source
http://dx.doi.org/10.1021/es201046xDOI Listing

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