TY - JOUR
T1 - Uptake of Au(III) ions by aluminum hydroxide and their spontaneous reduction to elemental gold (Au(0))
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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U2 - 10.1006/jcis.2000.7260
DO - 10.1006/jcis.2000.7260
M3 - Article
AN - SCOPUS:0034975696
VL - 233
SP - 112
EP - 116
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 1
ER -