Chitosan-Based Hydrogels for the Recovery of Precious Metals

Abstract:

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Chitosan (an aminopolysaccharide), cross-linked with glutaraldehyde, is very efficient for Pd(II) and Pt(IV) recovery from acidic solutions (pH 2). Due to poorly porous properties, it is necessary to condition the biopolymer as hydrogels. The uncontrolled drying of hydrogels depreciates the diffusion properties of original materials. A different method (to the acidic dissolving/alkaline neutralization procedure) has been used: after chitosan dissolving in acetic acid solution, the viscous solution was dropped into an ionotropic gelling solution (polyphosphate and glutaraldehyde to form stable gel beads with improved porosity. The restriction of diffusion properties due to drying step was less drastic with the modified procedure: a few hours were sufficient for reaching equilibrium while more than two days were required for standard material

Info:

Periodical:

Advanced Materials Research (Volumes 71-73)

Edited by:

Edgardo R. Donati, Marisa R. Viera, Eduardo L. Tavani, María A. Giaveno, Teresa L. Lavalle, Patricia A. Chiacchiarini

Pages:

733-736

DOI:

10.4028/www.scientific.net/AMR.71-73.733

Citation:

D. Sicupira et al., "Chitosan-Based Hydrogels for the Recovery of Precious Metals", Advanced Materials Research, Vols. 71-73, pp. 733-736, 2009

Online since:

May 2009

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Price:

$35.00

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