Uptake of Au(III) ions by aluminum hydroxide and their spontaneous reduction to elemental gold (Au(0))

Takushi Yokoyama; Yoko Matsukado; Akiko Uchida; Yoshinobu Motomura; Koichiro Watanabe; Eiji Izawa

doi:10.1006/jcis.2000.7260

Uptake of Au(III) ions by aluminum hydroxide and their spontaneous reduction to elemental gold (Au(0))

Takushi Yokoyama, Yoko Matsukado, Akiko Uchida, Yoshinobu Motomura, Koichiro Watanabe, Eiji Izawa

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	112-116
Number of pages	5
Journal	Journal of Colloid And Interface Science
Volume	233
Issue number	1
DOIs	https://doi.org/10.1006/jcis.2000.7260
Publication status	Published - Jan 1 2001

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Colloid and Surface Chemistry

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10.1006/jcis.2000.7260

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abstract = "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.",

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AU - Yokoyama, Takushi

AU - Matsukado, Yoko

AU - Uchida, Akiko

AU - Motomura, Yoshinobu

AU - Watanabe, Koichiro

AU - Izawa, Eiji

PY - 2001/1/1

Y1 - 2001/1/1

N2 - 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.

AB - 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.

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Uptake of Au(III) ions by aluminum hydroxide and their spontaneous reduction to elemental gold (Au(0))

Abstract

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