NH . Reaction intermediates were studied in detail and a number of them were identified using LC-MS/MS (ESI+), which allowed the proposal of a tentative pathway for the photocatalytic transformation of MET as a function of the TiO 2 specimen.

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Titanium dioxide nanopowders doped with different amounts of Fe ions were prepared by coprecipitation method. Obtained materials were characterized by structural (XRD), morphological (TEM and SEM), optical (UV/vis reflection and photoluminescence, and Raman), and analytical techniques (XPS and ICP-OES). XRD analysis revealed rutile crystalline phase for doped and undoped titanium dioxide obtained in the same manner. Diameter of the particles was 5–7 nm. The presence of iron ions was confirmed by XPS and ICP-OES. Doping process moved absorption threshold of TiO2into visible spectrum range. Photocatalytic activity was also checked. Doped nanopowders showed normal and up-converted photoluminescence.

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Abstract:The work describes a study of the oxidation power of N-doped and undoped anatase TiO 2 , as well as TiO 2 Degussa P25 suspensions for photocatalytic degradation of the herbicides propionic acid (mecoprop) and 3,6-dichloropyridine-2-carboxylic acid (clopyralid) using visible and UV light. Undoped nanostructured TiO 2 powder in the form of anatase was prepared by a sol-gel route. The synthesized TiO 2 , as well as TiO 2 Degussa P25 powder, were modified with urea to introduce nitrogen into the structure. N-doped TiO 2 appeared to be somewhat more efficient than the starting TiO 2 (anatase) powder when visible light was used for mecoprop degradation. N-doped TiO 2 Degussa P25 was also slightly more efficient than TiO 2 Degussa P25. However, under the same experimental conditions, no degradation of clopyralid was observed in the presence of any of the mentioned catalysts. When the kinetics of mecoprop degradation was studied using UV light, more efficient were the undoped powders, while in the case of clopyralid, N-doped TiO 2 Degussa P25 powder was most efficient, which is probably a consequence of the difference in the molecular structure of the two herbicides. OPEN ACCESSMolecules 2010, 15 2995

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