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.
Bibliographical noteHo, 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
- Titanium dioxide
- Thin films
- Photocatalytic activity