NDLI: Palladium and platinum sorption using chitosan-based hydrogels

Content Provider	Springer Nature Link
Author	Sicupira, Dalila Campos, Karol Vincent, Thierry Leao, Versiane Guibal, Eric
Copyright Year	2010
Abstract	Two chitosan hydrogels (prepared by NaOH neutralization and by polyphosphate ionotropic gelation) have been tested in the dry state for Pd(II) and Pt(IV) sorption at pH 2. Similar sorption isotherms with maximum sorption capacities close to 190 mg Pd g−1 and 235 mg Pt g−1 were achieved. The sorption mechanism involves electrostatic attraction of the chloro-anionic species onto protonated amine groups; the drastic decrease of sorption capacity with the addition of chloride ions supports this hypothesis. SEM-EDAX analysis suggests that sorption proceeds, in kinetic terms, through a shrinking core mechanism. Metal ions can diffuse throughout all the sorbent volume. The main differences between the sorbents are revealed by kinetics. The hydrogels prepared by ionotropic gelation in polyphosphate (C-PPh) allows reaching equilibrium much faster than the hydrogels prepared by the neutralization process (C-NaOH). While for C-PPh sorbent the chemical reaction rate seems to control sorption profiles, in the case of C-NaOH a combination of mechanisms including intraparticle diffusion resistance controls uptake kinetics. Metal desorption from loaded sorbents is possible using thiourea alone or in association with HCl solutions. The recycling of the sorbents is possible but for a limited number of cycles.
Starting Page	127
Ending Page	139
Page Count	13
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	16
Issue Number	3
e-ISSN	15728757
Language	English
Publisher	Springer US
Publisher Date	2010-04-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chitosan Ionotropic gelation Sodium polyphosphate Hydrogels Drying Sorption isotherms Intraparticle diffusion Uptake kinetics Desorption Engineering Thermodynamics, Heat and Mass Transfer Surfaces and Interfaces, Thin Films Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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