Adsorption and desorption of a gold-iodide complex onto cellulose acetate membrane coated with polyaniline or polypyrrole: a comparative study

M. M. Castillo-Ortega, I. Santos-Sauceda, J. C. Encinas, D. E. Rodriguez-Felix, T. Castillo-Castro, F. Rodriguez-Felix, J. L. Valenzuela-García, L. S. Quiroz-Castillo, P. J. Herrera-Franco

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Abstract

Cellulose acetate membranes (M1) with controlled thickness were coated with an electroconductive polymer, and the resulting composites were characterized by SEM, XPS, electrical conductivity, and mechanical measurements. A comparative study of M1 coated with polyaniline (PANI) or with polypyrrole (PPy) for adsorption and subsequent desorption of a gold-iodide complex was performed. The PANI-coated M1 (M2) and that coated with PPy (M3) are effective adsorbents for recovery of the AuI2 - complex. The adsorption of gold on the membranes was attributed to the exchange between the dopant ions and the AuI2 - complex ions. The adsorption equilibrium data fitted the Langmuir isotherm model for both membranes M2 and M3. The desorption of the AuI2 complex with a NH4OH solution 3 M reached 97% for M3 membrane. This study shows a convenient method for the recovery of gold through the use of a complex with iodine without cyanide solutions. © Springer Science+Business Media, LLC 2011.
Original languageEnglish
Pages (from-to)7466-7474
Number of pages9
JournalJournal of Materials Science
Volume46
Issue number23
DOIs
StatePublished - Dec 2011

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