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Transparent TiO2 thin films with high photocatalytic activity were prepared on glass substrates via the sol-gel method from tetraisopropyl titanium ethanol solution containing polyethylene glycol and diethylene glycol. Transparency of these TiO2 thin films was 80% in the visible region. Photocatalytic activity of the TiO2 thin films was studied using the decomposition of gaseous acetaldehyde. We found that the quantum yield with those films was similar to that with one of the most photoactive commercial TiO2 powders, Degussa P-25.

An anatase type of TiO 2 photocatalyst containing N atoms was synthesized by a new technique using a complex of Ti 41 with a nitrogen-containing ligand as a precursor. The TiO 2 -like photocatalyst prepared by calcination of a Ti 41 -bipyridine complex exhibited high photocatalytic activity for NO x removal under both ultraviolet and visible-light (l v 645 nm) illumination. The doping of the N atom into the anatase lattice, which is expected from UV-VIS spectroscopy, XRD, and XPS, is inferred as an important factor for the visible light absorption and NO x removal activity under a wide range of visible light illumination. The bipyridine ligand acted as the source of N and C atoms and additionally inhibited sintering of the photocatalyst during heat treatment.