Effects of inorganic anions on photoactivity of various photocatalysts under different conditions

✍ Scribed by Chun Hu; Tang Yuchao; Lin Lanyu; Hao Zhengping; Wang Yizhong; Tang Hongxiao

• Publisher: Wiley (John Wiley & Sons)
• Year: 2004
• Tongue: English
• Weight: 125 KB
• Volume: 79
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.934

✦ Synopsis

Abstract

The effects of inorganic anions (SO~4~^2−^, H~2~PO~4~^−^, HCO~3~^−^, F^−^) on the photoactivity of surface bond‐conjugated TiO~2~/SiO~2~ and Fe–TiO~2~/SiO~2~ for the photodegradation of Acid Red B were investigated. The introduction of iron changed the chemical environment of lattice titanium and the surface charge properties of TiO~2~/SiO~2~. Fe–TiO~2~/SiO~2~ inhibited the negative role of the selected inorganic anions. The effects of different light sources and dyes of various structure, with a sulfonate group, on the role of F^−^ in decolorization of Acid Red B were examined. F^−^ has the same negative influence on the photoactivity of TiO~2~/SiO~2~ with the blacklight lamp and solar irradiation, but shows no influence upon irradiation with the 254 nm lamp. The tested inorganic anions affected the photodegradation of dyes by controlling their adsorption onto the surface of the catalyst and by trapping h^+^ and ^•^OH. Copyright © 2004 Society of Chemical Industry