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Immobilized TiO 2  is required for most photocatalytic applications, but obtaining the adequate mechanical and chemical resistance without compromising activity can be very challenging. In order to gain further information about the effect of the substrate on photoactivity, the influence of their physicochemical properties on the efficiency of TiO 2  coating for photocatalytic air purification has been studied in this work. With this aim, two different chemicals, hydrogen sulfide (H 2 S) and trichloroethylene (TCE), were selected as model pollutants to determine the behavior of photoactive layers under diverse experimental conditions. Hydrogen sulfide is a widespread compound, which not only causes nuisance due to its unpleasant odor, perceptible at very low concentrations (&gt;0.5 ppbv), but is also responsible for corrosion in devices and materials. In this work, the efficiency for H 2 S photocatalytic degradation was compared for TiO 2  coatings deposited on different UVtransparent substrates: borosilicate glass and two organic polymers, polyethylene terephthalate (PET) and cellulose acetate (CA). In addition, TiO 2  was deposited on plates made of either borosilicate glass, or natural magnesium silicates, and the performance of these immobilized photocatalysts was determined for the elimination of trichloroethylene (TCE), as a model pollutant. Comparison of the activity of TiO 2  deposited on this ceramic support, with that of TiO 2  deposited on glass can provide valuable information about the influence of the substrate porosity on the photocatalytic efficiency. Results presented indicate that TiO 2  on sepiolite can be regarded as a hybrid photocatalyst, which combines adsorptive and photocatalytic properties.

Preparation of Photocatalytic Coatings Adapted to the Elimination of Airborne Pollutants: Influence of the Substrate on the Degradation Efficiency