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

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Abstract

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.

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Acknowledgments

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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Correspondence to E. Guibal.

Appendix

Appendix

See Fig. 12.

Fig. 12
figure 12

Simulation of Pd(II) and Pt(IV) sorption isotherms in binary solutions (0.1 M HCl solution) using the extended Langmuir equation (Eq. 7a, 7b) with the parameters of the Langmuir equation for mono-component solutions (Table 1) (simulated curves were calculated with discrete values of experimental concentrations and the trends were extrapolated joining point-to-point)

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Santos Sopena, L.A., Ruiz, M., Pestov, A.V. et al. N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions. Cellulose 18, 309–325 (2011). https://doi.org/10.1007/s10570-010-9469-8

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