Uranium Sorption on Various Forms of Titanium Dioxide 鈥?Influence of Surface Area, Surface Charge, and Impurities

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• 作者：M. Josick Comarmond ; Timothy E. Payne ; Jennifer J. Harrison ; Sangeeth Thiruvoth ; Henri K. Wong ; Robert D. Aughterson ; Gregory R. Lumpkin ; Katharina M眉ller ; Harald Foerstendorf
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：July 1, 2011
• 年：2011
• 卷：45
• 期：13
• 页码：5536-5542
• 全文大小：848K
• 年卷期：v.45,no.13(July 1, 2011)
• ISSN：1520-5851

文摘

Titanium dioxide (TiO₂) 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 TiO₂ 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 TiO₂ 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 TiO₂ 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.