Titanium dioxide (TiO2) is the most promising
semiconductor photocatalyst, which has been
extensively studied for environmental purification
applications, due to its good characteristics of
powerful oxidation strength, chemical stability and nontoxicity. It is especially interesting to support
TiO2 on inert substrates for wastewater and
indoor atmosphere remediation. The immobilization
of TiO2 in the form of a thin film provides an
advantage over the drawbacks encountered with
powder suspensions [1]: (i) separation of TiO2
particles from the suspension is difficult, (ii) the
suspended TiO2 particles tend to aggregate especially
at high concentrations and (iii) suspensions
are difficult to apply to continuous flow systems.