, Volume 18, Issue 2, pp 309–325 | Cite as

N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions

  • L. A. Santos Sopena
  • M. Ruiz
  • A. V. Pestov
  • A. M. Sastre
  • Y. Yatluk
  • E. Guibal


Chitosan was modified by grafting 2-pyridyl-ethyl moieties on the biopolymer backbone for the synthesis of a Platinum Group Metal (PGM) sorbent. The sorbent was tested for Pd(II) and Pt(IV) sorption from HCl solutions. Stable for HCl concentrations below 0.5 M, the sorbent reached sorption capacities as high as 3.2 and 2.6 mmol metal g−1 for Pd(II) and Pt(IV), respectively. Metal sorption mainly proceeds by electrostatic attraction in acidic solutions, though a contribution of complexation mechanism cannot be totally rejected. The resistance to intraparticle diffusion is the main controlling mechanism for uptake kinetics. While agitation speed has a limited effect on kinetics, metal concentration and sorbent dosage have a greater effect on the kinetic profiles. The intraparticle diffusivity varies between 3 × 10−11 and 4.5 × 10−10 m2 min−1. Thiourea (combined with HCl solution) is used for Pd(II) and Pt(IV) desorption. The resin could be desorbed and recycled for a minimum of five cycles maintaining high efficiencies of sorption and desorption.


Chitosan Pyridyl groups Palladium Platinum Sorption HCl concentration Isotherms Uptake kinetics Resistance to intraparticle diffusion Metal desorption Resin recycling 



L. A. S. S. acknowledges the grant from Erasmus European Program for her training period at Ecole des Mines d’Alès.


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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • L. A. Santos Sopena
    • 1
    • 2
  • M. Ruiz
    • 2
  • A. V. Pestov
    • 3
  • A. M. Sastre
    • 4
  • Y. Yatluk
    • 3
  • E. Guibal
    • 1
  1. 1.Laboratoire Génie de l’Environnement Industriel, Equipe Interfaces Fonctionnalisées pour l’Environnement et la SécuritéEcole des Mines d’AlèsAlès CedexFrance
  2. 2.Department of Chemical Engineering, EUPVGUniversitat Politècnica de CatalunyaVilanova I la GeltruSpain
  3. 3.I. Ya. Postovsky Institute of Organic SynthesisUrals Division of Russian Academy of SciencesYekaterinburgRussia
  4. 4.Department of Chemical Engineering, ETSEIBUniversitat Politècnica de CatalunyaBarcelonaSpain

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