Sulfur derivatives of chitosan for palladium sorption

• Published in: Reactive & functional polymers Vol. 50; no. 2; pp. 149 - 163
• Main Authors: Guibal, E, Von Offenberg Sweeney, N, Vincent, T, Tobin, J.M
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 2002; Elsevier Science; Elsevier
• 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; Chitosan derivatives; Sorption kinetics; Thiourea; Palladium; pH effect; Rubeanic acid; Sorption isotherms; Particle size; Liquid solid adsorption; Temperature effect; Metal ion; Experimental study; Binding capacity; Palladium ion; Acid resistance; Size effect; Crosslinked polymer; pH; Oside polymer; Sulfur containing polymer; Kinetics; Sorbent; Thiourea Rubeanic acid
• ISSN: 1381-5148
• DOI: 10.1016/S1381-5148(01)00110-9

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.