Please use this identifier to cite or link to this item:
Title: Recovery of gold by electroless precipitation from acid solutions using polyaniline
Authors: Ting, Y.P. 
Neoh, K.G. 
Kang, E.T. 
Tan, K.L. 
Keywords: Acid solution
Au reduction
Redox states
Issue Date: Jan-1994
Citation: Ting, Y.P., Neoh, K.G., Kang, E.T., Tan, K.L. (1994-01). Recovery of gold by electroless precipitation from acid solutions using polyaniline. Journal of Chemical Technology and Biotechnology 59 (1) : 31-36. ScholarBank@NUS Repository.
Abstract: The oxidation of the leucoemeraldine (LM) and emeraldine (EM) states of polyaniline (PAN) and the subsequent reprotonation and reduction of the nigraniline (NA) and pernigraniline (PNA) in acid gold solution were utilized for the spontaneous and sustained reduction of gold. The rate of Au reduction is strongly dependent on the intrinsic oxidation state of the polymer and the polymer surface area. The rate also increases with decreasing pH of the chloroauric solution to about pH ~ 1. X-ray photoelectron spectroscopic (XPS) results indicate that only elemental gold or Au(0) accumulates on the polymer surface. The N1s core-level spectra of the protonated and base form of EM films after Au reduction confirm that the intrinsic structure of the polymer remains intact. The process, however, is limited by the decreasing effective surface area of the polymer due to Au deposition. The results indicate that an LM film accumulated up to five times its own weight of Au (Au/monomer mole ratio > 2) before the recovery rate was significantly retarded.
Source Title: Journal of Chemical Technology and Biotechnology
ISSN: 02682575
DOI: 10.1002/jctb.280590106
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Feb 13, 2019


checked on Feb 4, 2019

Page view(s)

checked on Feb 9, 2019

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.