Sulfur derivatives of chitosan for palladium sorption

Palladium is efficiently extracted from dilute acidic solutions using chitosan derivatives. Sorption performances are enhanced by modification of chitosan through the grafting of sulfur compounds (thiourea, rubeanic acid), which creates new chelating groups, on chitosan backbone using glutaraldehyde...

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Bibliographic Details
Published in:Reactive & functional polymers 2002, Vol.50 (2), p.149-163
Main Authors: Guibal, E, Von Offenberg Sweeney, N, Vincent, T, Tobin, J.M
Format: Article
Language:English
Subjects:
Applied sciences
Chemical Sciences
Chitosan derivatives
Exact sciences and technology
Natural polymers
Palladium
pH effect
Physicochemistry of polymers
Rubeanic acid
Sorption isotherms
Sorption kinetics
Starch and polysaccharides
Thiourea
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Summary:Palladium is efficiently extracted from dilute acidic solutions using chitosan derivatives. Sorption performances are enhanced by modification of chitosan through the grafting of sulfur compounds (thiourea, rubeanic acid), which creates new chelating groups, on chitosan backbone using glutaraldehyde as a linker. A comparison of sorption isotherms and sorption kinetics of these two derivatives with those of glutaraldehyde cross-linked chitosan shows that the rubeanic acid derivative of chitosan is the more efficient for the uptake of palladium from dilute solutions. The chemical modification is suspected of bringing chelating functionalities to the ion exchange resin. Sorption capacity is not influenced by the particle size of rubeanic acid derivative of chitosan. Sorption isotherms are described by the Langmuir equation. Increasing the temperature of the solution has little effect on sorption performances. Sorption kinetics are not greatly influenced by the particle size of the sorbent.
ISSN:1381-5148
DOI:10.1016/S1381-5148(01)00110-9