Abstract
The sorption of uranium(VI) on the perovskite structure of strontium titanate in a 0.5M KNO3 solution is studied. SrTiO3 commercial material was characterized by XRD showing a tausonite face, with a specific area of 2.42 m2.g−1. The electrical surface characterization of the compound was performed by mass and potentiometric titrations. pHpzc in water was 8.5±0.3 and 9.1±0.2 in 0.5M KNO3 solution, showing a positively charged surface. FITEQL 4.0 program was used to calculate the sorption curves and the surface acidity constants by the constant capacitance model obtaining: log K 1 = 8.67 and log K 2 = −9.43. The sorption edge was fitted with two different uranium(VI) species sorbed, corresponding to bidentate complexes of UO 2+2 and UO2(OH)2H2O on the surface of strontium titanate.
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Ortiz-Oliveros, H.B., Ordoñez-Regil, E. & Fernández-Valverde, S.M. Sorption of uranium(VI) onto strontium titanate in KNO3 medium. J Radioanal Nucl Chem 279, 601–610 (2009). https://doi.org/10.1007/s10967-007-7142-y
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DOI: https://doi.org/10.1007/s10967-007-7142-y