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

被引：0
作者：
L. A. Santos Sopena
M. Ruiz
A. V. Pestov
A. M. Sastre
Y. Yatluk
E. Guibal
机构：
[1] Ecole des Mines d’Alès,Laboratoire Génie de l’Environnement Industriel, Equipe Interfaces Fonctionnalisées pour l’Environnement et la Sécurité
[2] Universitat Politècnica de Catalunya,Department of Chemical Engineering, EUPVG
[3] Urals Division of Russian Academy of Sciences,I. Ya. Postovsky Institute of Organic Synthesis
[4] Universitat Politècnica de Catalunya,Department of Chemical Engineering, ETSEIB
来源：
Cellulose | 2011年 / 18卷
关键词：
Chitosan; Pyridyl groups; Palladium; Platinum; Sorption; HCl concentration; Isotherms; Uptake kinetics; Resistance to intraparticle diffusion; Metal desorption; Resin recycling;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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.
引用
收藏
页码：309 / 325
页数：16
相关论文
共 195 条
  • [1] Adhikari CR(2008)Dimethylamine-modified waste paper for the recovery of precious metals Environ Sci Technol 42 5486-5491
  • [2] Parajuli D(1992)Selective adsorption of palladium(II), platinum(IV), and mercury(II) on a new chitosan derivative possessing pyridyl group Chem Lett 21 1905-1908
  • [3] Kawakita H(1996)Highly selective adsorption resins. I. Preparation of chitosan derivatives containing 2-pyridylmethyl, 2-thienylmethyl, and 3-(methylthio)propyl groups and their selective adsorption of precious metals Bull Chem Soc Jpn 69 1255-1260
  • [4] Inoue K(1998)Synthesis of a chitosan derivative recognizing planar metal ion and its selective adsorption equilibria of copper(II) over iron(III) React Funct Polym 36 167-172
  • [5] Ohto K(2004)Recovery of platinum from spent catalyst Hydrometallurgy 72 179-184
  • [6] Harada H(2006)Recovery and separation of palladium from spent catalyst Appl Catal A 301 182-186
  • [7] Baba Y(2009)Separation and recovery of palladium(II) from base metal ions by melamine-formaldehyde-thiourea (MFT) chelating resin Hydrometallurgy 95 15-21
  • [8] Hirakawa H(2007)Recovery of palladium from palladium phthalocyanine complex adsorbed on silica Hydrometallurgy 87 140-147
  • [9] Baba Y(2005)Palladium and platinum recovery from bicomponent mixtures using chitosan derivatives Hydrometallurgy 76 131-147
  • [10] Kawano Y(2007)Extraction of palladium(II) ions from chloride solutions with phosphonium ionic liquid Cyphos IL101 Pol J Chem Technol 9 99-101
12345678910