Gold Recovery Using Inherently Conducting Polymer Coated Textiles

  • Tsekouras, George (Intelligent Polymer Research Institute, University of Wollongong) ;
  • Ralph, Stephen F. (Intelligent Polymer Research Institute, University of Wollongon) ;
  • Price, William E. (Intelligent Polymer Research Institute, University of Wollongon) ;
  • Wallace, Gordon G. (Intelligent Polymer Research Institute, University of Wollongong)
  • Published : 2004.03.01

Abstract

The ability of inherently conducting polymer (ICP) coated textiles to recover gold metal from aqueous solutions containing $[AuCl_4]^-$ was investigated. Nylon-lycra, nylon, acrylic, polyester and cotton were coated with a layer of polypyrrole (PPy) doped with 1,5-naphthalenedisulfonic acid (NDSA), 2-anthraquinonesulfonic acid (AQSA) or p-toluenesulfonic acid (pTS). Textiles coated with polyaniline (PAn) doped with chloride were also used. The highest gold capacity was displayed by PPy/NDSA/nylon-lycra, which exhibited a capacity of 115 mgAu/g coated textile, or 9700 mgAu/g polymer. Varying the underlying textile substrate or the ICP coating had a major effect on the gold capacity of the composites. Several ICP coated textiles recovered more than 90 % of the gold initially present in solutions containing 10 ppm $[AuCl_4]^-$ and 0.1 M HCl in less than 1 min. Both PPy/NDSA/nylon-lycra and PAn/Cl/nylon-lycra recovered approximately 60 % of the gold and none of the iron present in a solution containing 1 ppm $[AuCl_4]^-$, 1000 ppm $Fe^{3+}$ and 0.1 M HCl. The spontaneous and sustained recovery of gold metal from aqueous solutions containing $[AuCl_4]^-$ using ICP coated textiles has good prospects as a potential future technology.

Keywords

References

  1. J. Marsden and I. House, 'The Chemistry of Gold Extrac-tion', Chap. 6, P.259, Ellis Horwood, New York, 1992
  2. J. C. Yannopoulos, 'The Extractive Metallurgy of Gold'Chap. 9, p.171, Van Nostrand Reinhold, New York, 1991
  3. E. T. Kang, Y. P. Ting, K. G. Neoh, and K. L. Tan, Polymer, 34,4994 (1993) https://doi.org/10.1016/0032-3861(93)90034-8
  4. E. T. Kang, Y. P. Ting, K. G. Neoh, and K. L. Tan, Synthetic Metats, 69, 477 (1995) https://doi.org/10.1016/0379-6779(94)02533-5
  5. K. G. Neoh, T. T. Young, N. T. Looi, E. T. Kang, and K. L. Tan, Chem. Mater., 9, 2906 (1997) https://doi.org/10.1021/cm970249o
  6. K. G. Neoh, K. T. Tan, P. L. Goh, S. W. Huang, E. T. Kang, and K. L. Tan, Potymer, 40, 887 (1999)
  7. W. E. Price, S. F. Ralph, and G. G. Wallace, Aust. J. Chem., 54,615(2001) https://doi.org/10.1071/CH01167
  8. J. Ding, W. E. Price, S. F. Ralph, and G. G. Wallace, J. Appt. Potym Sci. (submitted)
  9. H. H. Kuhn and A. D. Child in 'Handbook of Conducting Polymers', 2nd ed. (T. A. Skotheim, R. L. Elsenbaumer, and J. R. Reynolds Eds.), Marcel Dekker, New York, 1998
  10. J. Ding, V. Misoska, W. E. Price, S. F. Ralph, G. Tsekouras, and G. G. Wallace, Synthetic Metats, 135-136, 35 (2003)