Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28057
Title: Effect of gold ion doping on the photo-catalytic properties and photo-activity of TiO2
Authors: Li, FB
Li, XT
Li, XJ
Wan, HF
Keywords: Electron-field -induced surface photo-voltage spectra
Gold ion
Impurity energy level
Methylene blue
Titanium dioxide
Visible light
Issue Date: 2001
Publisher: 科學出版社
Source: 化学学报 (Acta chimica sinica), 2001, v. 59, no. 7, p. 1072-1077 How to cite?
Journal: 化学学报 (Acta chimica sinica) 
Abstract: Methylene Blue (MB) undergoes rapid mineralization in aqueous TiO2 dispersions with or without doping with gold ion upon radiation with visible light (high-pressure sodium lamp). UV-visible absorption and TOC measurement were employed to disclose details of decolorization and mineralization. The presence of gold ion in TiO2 greatly enhanced their photo-activity. The optimum molar content of gold ion doping was 0.5%. Investigation of crystal structure, chemical components, optical absorption properties, photoluminescence emission spectra and photo-voltage properties disclosed the mechanism of gold ion doping. UV-visible absorption spectra showed that the optical absorption increased in the visible region. Owing to gold impurity energy level, it is possible for gold ion doped TiO2 to be excited by visible light (E < 3.2 eV). Gold impurities also lead to decrease photoluminescence (PL) emission and electron-field-induced surface photo -voltage spectra (EFISPS) and hinder the recombination of electron/hole. The order of EFISPS intensity and PL intensity (from weak to strong) had a good agreement with that of photo-activity (from strong to weak).
URI: http://hdl.handle.net/10397/28057
ISSN: 0567-7351
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