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Commercial titanium dioxide powder is a powerfull photocatalyst but its small grain size (30 nm) gives filtration difficulties. Titanium dioxide (TiO sub(2)) has been supported in silicon dioxide prepared by soil-gel route. The catalytic mass obtained is photo-efficient in the carbetamide degradation. However, to facilitate the correct TiO sub(2) distribution in the catalytic support, the mass of the silica gel must be higher than that of the TiO sub(2) catalyst. The silicon dioxide gel appears as a very good adsorbant for carbetamide (specific surface area higher than 600 m super(2)/g). Using this property in the water depollution field, the catalytic mass can be employed as an adsorbant-catalyst and then, can be regenerated by the photocatalytic process.