Abstract
Transparent TiO₂ sols were prepared by hydrothermal synthesis to heat Ti precursor solutions, from Ti hydroxides obtained with neutralizing aqueous TiOCl₂ solutions having various concentrations of NaCl by aqueous NaOH solution, in the autoclave at 120℃. The photocatalytic abilities of glass beads coated with the sol for gaseous benzene were evaluated. As a result, it was found that due to the increase of brookite phase in TiO₂ by controlling the concentration of Na ion the optical absorption of TiO₂ increases toward long wavelength but that in the area of short wavelength becomes relatively low and consequently the photocatalytic performance of TiO₂ thin film for benzene gas rather decreases, compared to that of composite film of anatase and brookite phases. These results suggest that in order for coated TiO₂ thin film to have high dissociation performance for benzene gas it is effective to form anatase and brookite phases compositely in TiO₂.
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