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

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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 languageEnglish
Pages (from-to)112-116
Number of pages5
JournalJournal of Colloid And Interface Science
Issue number1
Publication statusPublished - 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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