Adsorption and desorption of a gold-iodide complex onto cellulose acetate membrane coated with polyaniline or polypyrrole: a comparative study: 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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23 Scopus citations

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.

Original languageEnglish
Pages (from-to)7466-7474
Number of pages9
JournalJournal of Materials Science
Volume46
Issue number23
DOIs
StatePublished - Dec 2011

Bibliographical note

Funding Information:
Fig. 8 Percentage of Au desorption against time of M2 and M3 membranes Acknowledgements This study was supported by grant from the CONACYT (Project CB-2008-105003). The authors thank their colleagues Jesus Javier Cervantes Soto for his assistance in the analysis of the aqueous samples by absorption spectroscopy, Roberto Mora and Josefina Alvarado for the XPS studies.

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