The effect of UV irradiation on the reduction of Au(III) ions adsorbed on manganese dioxide

Hironori Ohashi, Hiroyuki Ezoe, Yoshihiro Okaue, Yasuhiro Kobayashi, Shuji Matsuo, Tsutomu Kurisaki, Akane Miyazaki, Hisanobu Wakita, Takushi Yokoyama

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Abstract

The effect of UV (ultraviolet) irradiation on the adsorption of Au(III) ions on manganese dioxide and their reduction to Au(0) (gold with 0 valence state) was investigated using XPS (X-ray photoelectron spectroscopy) and 197 Au Mössbauer spectroscopy. The UV irradiation accelerated the adsorption and the reduction. From the fact that the proportion of Au(0) estimated from Au 4f XPS spectra for surface analysis was significantly smaller than that from 197 Au Mössbauer spectra for bulk analysis, we deduced that Au(0) was interpenetrated to the inside of manganese dioxide (into deeper places than about 30 Å) where XPS is impossible to detect. The content of surface hydroxyl groups on manganese dioxide also increased due to the UV irradiation. The relationship between the charge in the content of hydroxyl groups and the interpenetration of Au(0) is discussed. 2005

Original languageEnglish
Pages (from-to)789-793
Number of pages5
Journalanalytical sciences
Volume21
Issue number7
DOIs
Publication statusPublished - Jul 2005

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All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

Ohashi, H., Ezoe, H., Okaue, Y., Kobayashi, Y., Matsuo, S., Kurisaki, T., ... Yokoyama, T. (2005). The effect of UV irradiation on the reduction of Au(III) ions adsorbed on manganese dioxide. analytical sciences, 21(7), 789-793. https://doi.org/10.2116/analsci.21.789