Abstract
Influence of complex formation in solution on U sorption has been studied for mesoporous nanostructured anatase-based composites. Uranium sorption degree has been shown to correlate with the stability of the complexes in solution. A model for uranium sorption by titania materials has been suggested presuming two-stage sorption mechanism. It is assumed that initial binding of neutral and positively charged uranyl complexes to negatively charged hydroxyl groups occurs on the first stage, while decomposition of complex ion proceeds on the second stage with the UO2 being fixed on sorption sites. Prevailing uranium species in solution and kinetics of their ratios have been determined. Calculated rates of evolution of uranyl ion species distribution (therefore, rate and efficiency of the sorption) correlate well with complex stability in solution.
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