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Photocatalytic reactivity of the titanium oxide loaded on a stainless steel screen by a spraying method

To reduce a film-diffusional resistance in the very vicinity of the photocatalyst surface, titanium oxide particles containing a small amount of adsorbent particles (310 %) are immobilized on a stainless steel screen by a spraying method and its performance is investigated by decomposing 2,4-dinitrophenol in water. It is found that the activity of this photocatalyst screen is higher than that of the photocatalyst glass tube prepared by the conventional dip-coating method in the region of low linear velocity. A simple mathematical model that takes into consideration the photocatalytic reaction, diffusion, and adsorption is used to interpret the experimental result.