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A comparative study over the photocatalytic activity of nanostructured TiO2 layers for air purifiers

M.V. Diamanti, B. Del Curto, MP. Pedeferri, A. Cigada
Politecnico di Milano, IT

Keywords: air purifier, anodizing, light devices, photocatalysis, titanium dioxide


The research presents an investigation over the efficiency of nanostructured TiO2 films as photocatalysts either in air purification systems or to be integrated in light devices, based on the exploitation of UV or Vis irradiation to induce the degradation of hazardous chemical compounds. Gas pollutants (NO) and dyes (rhodamine B) will be considered as model reactants. To summarize the obtained results in possible devices to be implemented, a configuration considering polymeric pellets coated with TiO2 by sol-gel route results to be particularly suitable for air purifiers preset to shield the UV radiation. Conversely, light devices including anodized titanium can be studied, which would not only confer an appealing aesthetics due to the interference colors generated by the anodic oxides, but also assure a slow but constant degradation of indoor pollution if activated by ad hoc lamps simulating solar light. In this case, a correct study of the irradiation system must be performed so as to limit the diffusion of the UV component in the environment.
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