Abstract
The sorption of strontium and lanthanum on antimonic acid (HAP) and on two phosphatoantimonic acids, H3Sb3O6(PO4)2 (RH3) and H5Sb5O12(PO4)2 (RH5) were studied by three types of measurements: kinetics of fixation, distribution coefficients at trace level and sorption capacity. A 2H+/Sr2+ or 3H+/La3+ exchange stoichiometry and an affinity order of HAP>RH5>RH3 for Sr and RH3>HAP>RH5 for La were observed. The fixation kinetics is very fast for RH3. For HAP and RH5, there is a fast step followed by a slow diffusion-controlled step. The results are interpreted by comparing the chemical compositions and crystal structures of the three sorbents. Applications to radioactive waste treatment are discussed.
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