Photooxidation of acetaldehyde over TiO2 film: Impact of the substrate glassy structure on the photonic efficiency

Mesoporous TiO2 films were dip-coated onto diverse conductive glass substrates such as Indium Tin Oxide (ITO) and F-doped Tin Oxide (FTO) as well soda-lime glass (SL). The mesoporous TiO2 films were assessed for their photodegradation of CH3CHO in gas phase as a probe molecule and compared with both nonporous TiO2 film deposited on FTO and commercial float glass. The thickness and surface areas of the mesoporous TiO2 film were determined to be around 228 +/- 10, 184 +/- 15 and 205 +/- 15 nm and 215, 352 and 295 m(2)/cm(3) deposition on SL, FTO and ITO, respectively. The prepared mesoporous TiO2 film deposited on SL, FTO and ITO exhibited higher photonic efficiency than nonporous TiO2 film and float glass. The photonic efficiency of mesoporous TiO2 film is the following order FTO > ITO > SL. The photonic efficiency of TiO2/FTO is greater 21 and 3 times than that float glass and nonporous TiO2/FTO, respectively. In addition, the outstanding photocatalytic activity of mesoporous TiO2/FTO substrate is shown in recycling tests in which no significant reduce in the photonic efficiency was recognized after five cycles for 10 h continuously, indicating a promising materials for potential applications.