Enhanced photocatalytic activity of supported TiO2: Dispersing effect of SiO2

Yiming Xu, Wei Zheng, Weiping Liu

Research output: Contribution to journalArticlepeer-review

Abstract

The physical and photocatalytic properties of the TiO2 loaded on a unique silica using a TiO2 sols, which was prepared by the hydrolysis of titanium n-butoxide in water (pH = 1.1) containing different alcohols and alcohol concentration, have been examined. Compared to the bare TiO2 prepared in parallel, all the supported TiO2 showed a higher photoactivity for the oxidation of acetophenone in water. The supported catalyst were mainly anatase crystallites of smaller size, and had a slightly higher adsorptivity toward the organic substrate. Upon the change of alcohols and alcohol concentration in the sol-gel mixture, the supported TiO2 exhibited different response from the bare TiO2 in the crystal structures and photoactivity. In addition, the supported TiO2 showed a higher photoactivity on a silica of smaller particle size than on the silica of larger particles. The results suggest that the dispersion effect of silica is operative, which could be the basic role of any porous support for the TiO2 photocatalysis.

Original languageEnglish (US)
Pages (from-to)57-60
Number of pages4
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume122
Issue number1
DOIs
StatePublished - Mar 10 1999
Externally publishedYes

Keywords

  • Dispersion effect
  • Photocatlysis
  • Silicon dioxide
  • Titanium dioxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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