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Sorption of aqueous palladium onto synthetic hydroxyapatite |
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| Authors: | J. M. Soriano-Rodr��guez V. E. Badillo-Almaraz C. Alliot F. Monroy-Guzm��n P. Vitorge |
| Affiliation: | 1. Facultad de Ciencias, Universidad Aut??noma del Estado de M??xico, 50100, Toluca, Estado de M??xico, Mexico 2. Instituto Nacional de Investigaciones Nucleares, Carr. M??xico-Toluca S/N (km. 36.5), La Marquesa, 52750, Ocoyoacac, Estado de M??xico, Mexico 3. GIP Arronax, 1 rue Aronnax, BP 10112, 48817, Saint Herblain Cedex, France 4. Inserm U892, CHU ?C Institut de Biologie, 9 quai Moncousu, 44093, Nantes Cedex 1, France 5. CEA, DEN, Saclay, DPC, SECR, LSRM, 91191, Gif sur Yvette, France 6. Universit?? d??Evry, CEA, CNRS, LAMBE, UMR 8587, 91025, Evry, France |
| Abstract: | The sorption of Pd(II) on hydroxyapatite (Ca10(PO4)6(OH)2) has been studied at 25 °C as a function of pH, in 0.01 M NaClO4, and 0.01 and 0.025 M Ca(ClO4)2 aqueous background electrolytes and Pd(II) concentration (9.3 to 47 ??M), trying to minimize some types of reactions, such as solid dissolution of and metal precipitation. The radiotracer palladium, 109Pd, obtained by neutron irradiation, has been used to calculate the palladium??s distribution coefficients K d between aqueous and solid phase. A mathematical treatment of results has been made by ion-exchange theory in order to interpret palladium sorption onto treated solid. For this, we take into account the existence of active sites at the hydroxyapatite surface, and the aqueous solution chemistry of palladium as well as the effect of phosphate anions from solid dissolution. The results can be explained as evidence of sorption of the species PdOH+, and of a mixed hydroxo complex of Pd2+ like (XCaO?)?CPdOH+·nH2O fixed onto {??Ca?COH} surface sites of the hydroxyapatite. |
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