Photocatalytic activity and photo-induced hydrophilicity of mesoporous TiO2 thin films coated on aluminum substrate

Wing Kei HO, Jimmy C. YU, Shuncheng LEE

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34 Citations (Scopus)

Abstract

Mesoporous TiO2 thin 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-TiO2 thin films exhibited a better photocatalytic performance than that of SG-TiO2 in the degradation of acetone in air and photo-induced hydrophilicity. This was attributed to the fact that the RM-TiO2 thin films had higher specific surface area and porosity than that of SG-TiO2. The larger surface-to-volume ratio of mesoporous RM-TiO2 thin 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-TiO2 thin 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. Copyright © 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)135-143
JournalApplied Catalysis B: Environmental
Volume73
Issue number1-2
DOIs
Publication statusPublished - 24 Apr 2007

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Hydrophilicity
Aluminum
aluminum
substrate
Thin films
Substrates
Quartz
Stainless Steel
Acetone
acetone
Stainless steel
steel
quartz
Degradation
degradation
surface roughness
Specific surface area
Hydroxyl Radical
Sol-gel process
recombination

Bibliographical note

Ho, W., Yu, C. J., & Lee, S. (2007). Photocatalytic activity and photo-induced hydrophilicity of mesoporous TiO₂ thin films coated on aluminum substrate. Applied Catalysis B: Environmental, 73(1-2), 135-143. doi: 10.1016/j.apcatb.2006.06.019

Keywords

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