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Sorption of aqueous palladium onto synthetic hydroxyapatite

  • J. M. Soriano-Rodríguez
  • V. E. Badillo-AlmarazEmail author
  • C. Alliot
  • F. Monroy-Guzmán
  • P. Vitorge
Article
  • 161 Downloads

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 μM), 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)–PdOH+·nH2O fixed onto {≡Ca–OH} surface sites of the hydroxyapatite.

Keywords

Palladium Sorption Hydroxyapatite Surface sites Ion-exchange theory 

Notes

Acknowledgments

The authors acknowledge to W. Nava-Solares, M. Alba-Escobar and M. Hernandez-Paz, from the reactor team at ININ for their assistance during the radionuclide production. J. M. Soriano-Rodríguez appreciates the scholarship (No. 190859) by CONACYT (Consejo Nacional de Ciencia y Tecnología), Mexico.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2011

Authors and Affiliations

  • J. M. Soriano-Rodríguez
    • 1
    • 2
  • V. E. Badillo-Almaraz
    • 2
    Email author
  • C. Alliot
    • 3
    • 4
  • F. Monroy-Guzmán
    • 2
  • P. Vitorge
    • 5
    • 6
  1. 1.Facultad de CienciasUniversidad Autónoma del Estado de MéxicoTolucaMexico
  2. 2.Instituto Nacional de Investigaciones NuclearesOcoyoacacMexico
  3. 3.GIP ArronaxSaint Herblain CedexFrance
  4. 4.Inserm U892, CHU – Institut de BiologieNantes Cedex 1France
  5. 5.CEA, DEN, Saclay, DPC, SECR, LSRMGif sur YvetteFrance
  6. 6.Université d’Evry, CEA, CNRS, LAMBE, UMR 8587EvryFrance

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