Please use this identifier to cite or link to this item: https://doi.org/10.1002/jctb.280590106
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
Polyaniline
Redox states
XPS
Issue Date: Jan-1994
Source: 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. https://doi.org/10.1002/jctb.280590106
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
URI: http://scholarbank.nus.edu.sg/handle/10635/67535
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.

SCOPUSTM   
Citations

71
checked on Dec 13, 2017

WEB OF SCIENCETM
Citations

74
checked on Nov 16, 2017

Page view(s)

31
checked on Dec 10, 2017

Google ScholarTM

Check

Altmetric


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