Photocatalytic activity and photo-induced hydrophilicity of mesoporous TiO2thin films coated on aluminum substrate

Wingkei Ho, Jimmy C. Yu, Shuncheng Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

37 Citations (Scopus)

Abstract

Mesoporous TiO2thin films were prepared on aluminum substrate via the reverse micellar method (RM-TiO2) and sol-gel method (SG-TiO2), respectively. It was found that the mesoporous RM-TiO2thin films exhibited a better photocatalytic performance than that of SG-TiO2in the degradation of acetone in air and photo-induced hydrophilicity. This was attributed to the fact that the RM-TiO2thin films had higher specific surface area and porosity than that of SG-TiO2. The larger surface-to-volume ratio of mesoporous RM-TiO2thin films can serve as a more efficient transport path for gaseous reactants and products in photocatalytic reactions, thus improving the photocatalytic activity. The photocatalytic performance and hydrophilicity of RM-TiO2thin films coated on different substrates were also compared. The aluminium-supported samples showed a slower photocatalytic rate than those on quartz and stainless steel in the degradation of acetone because aluminum ions diffused from the substrate and acted as a charge recombination center. However, the hydrophilic property of the TiO2/Al sample was superior to those on quartz and stainless steel substrates, probably due to its higher surface roughness and hydroxyl content.
Original languageEnglish
Pages (from-to)135-143
Number of pages9
JournalApplied Catalysis B: Environmental
Volume73
Issue number1-2
DOIs
Publication statusPublished - 24 Apr 2007

Keywords

  • Hydrophilicity
  • Mesoporous
  • Photocatalytic activity
  • Thin films
  • Titanium dioxide

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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