Uptake of Au(III) Ions by Aluminum Hydroxide and Their Spontaneous Reduction to Elemental Gold (Au(0))

The behavior of AuCl4− ions during the formation of aluminum hydroxide at pH 6 was examined. With an increase in NaCl concentration, the content of gold taken up by aluminum hydroxide decreased, suggesting that chloro-hydroxy complexes of Au(III) ion were taken up due to the formation of Al−O−Au bon...

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Bibliographic Details
Published in:Journal of colloid and interface science 2001-01, Vol.233 (1), p.112-116
Main Authors: Yokoyama, Takushi, Matsukado, Yoko, Uchida, Akiko, Motomura, Yoshinobu, Watanabe, Koichiro, Izawa, Eiji
Format: Article
Language:English
Subjects:
aluminum hydroxide
Chemistry
chloro-hydroxy Au(III) ion
Exact sciences and technology
General and physical chemistry
reduction
Solution properties
Solutions
uptake mechanism
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Summary:The behavior of AuCl4− ions during the formation of aluminum hydroxide at pH 6 was examined. With an increase in NaCl concentration, the content of gold taken up by aluminum hydroxide decreased, suggesting that chloro-hydroxy complexes of Au(III) ion were taken up due to the formation of Al−O−Au bonds. It was found unexpectedly that the Au(III) ions taken up were spontaneously reduced to elemental gold without addition of a specific reducing reagent and then colloidal gold particles were formed. The mechanisms for the uptake of Au(III) ions by aluminum hydroxide and for their spontaneous reduction are discussed.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.2000.7260