<Emphasis Type="Italic">N</Emphasis>-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions |
| |
| Authors: | L?A?Santos Sopena M?Ruiz A?V?Pestov A?M?Sastre Y?Yatluk Email author" target="_blank">E?GuibalEmail author |
| |
| Institution: | 1.Laboratoire Génie de l’Environnement Industriel, Equipe Interfaces Fonctionnalisées pour l’Environnement et la Sécurité,Ecole des Mines d’Alès,Alès Cedex,France;2.Department of Chemical Engineering, EUPVG,Universitat Politècnica de Catalunya,Vilanova I la Geltru,Spain;3.I. Ya. Postovsky Institute of Organic Synthesis,Urals Division of Russian Academy of Sciences,Yekaterinburg,Russia;4.Department of Chemical Engineering, ETSEIB,Universitat Politècnica de Catalunya,Barcelona,Spain |
| |
| 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. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
