Abstract
For the first time, the continuous variation method was applied for the evaluation of the stoichiometry of uranyl phosphate complexes sorbed on bentonite. Sorption of UO 2 (CH 3 COO) 2 ⋅2H 2 O in the presence of Na 2 HPO 4 ⋅7H 2 O from 0.001 mol/L solutions led to the appearance of maxima in the sorption peaks of U(VI) and P(V) ions at molar ratios of [U(VI)]/[P(V)] s = 1.4, 3.3, 3.6 and 1.2, 1.7. It is suggested, based on complementary XRD and XPS data, that the UO 2 HPO 4 complex is located on aluminols (oAl-OH) whereas the (UO 2 ) 3 (PO 4 ) 2 ⋅4H 2 O complex is precipitated in the interlamellar space of bentonite. The participation of (UO 2 ) 3 (OH) 5 + and (UO 2 ) 4 (OH) 7 + species in the formation of U(VI) surface complexes is suggested, based on the deconvolution of sorption spectra of U(VI) on the bentonite in the presence of phosphates.
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