Dye sensitization of photocatalytical oxidation (PCO) has been found t
o be a new pathway of pollutant degradation. Terbutylazine was decompo
sed by applying visible light using rose bengal as sensitizer and tita
nium dioxide as photocatalyst. Degradation rates of > 50% have been re
alized. A mechanism of the sensitized photocatalytical oxidation (SPCO
) is proposed.