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Molecules 2010, 15(5), 2994-3009; doi:10.3390/molecules15052994

Photocatalytic Degradation of Mecoprop and Clopyralid in Aqueous Suspensions of Nanostructured N-doped TiO2

Department of Chemistry, Faculty of Science, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia
Laboratory of Nanocomposite and Nanofunctional Materials, IMS, NCSR Demokritos, Athens 153 10, Greece
Author to whom correspondence should be addressed.
Received: 22 January 2010 / Revised: 18 March 2010 / Accepted: 20 April 2010 / Published: 27 April 2010
(This article belongs to the Special Issue Heterogeneous Catalysis)
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The work describes a study of the oxidation power of N-doped and undoped anatase TiO2, as well as TiO2 Degussa P25 suspensions for photocatalytic degradation of the herbicides RS-2-(4-chloro-o-tolyloxy)propionic acid (mecoprop) and 3,6-dichloro-pyridine-2-carboxylic acid (clopyralid) using visible and UV light. Undoped nanostructured TiO2 powder in the form of anatase was prepared by a sol-gel route. The synthesized TiO2, as well as TiO2 Degussa P25 powder, were modified with urea to introduce nitrogen into the structure. N-doped TiO2 appeared to be somewhat more efficient than the starting TiO2 (anatase) powder when visible light was used for mecoprop degradation. N-doped TiO2 Degussa P25 was also slightly more efficient than TiO2 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 TiO2 Degussa P25 powder was most efficient, which is probably a consequence of the difference in the molecular structure of the two herbicides.
Keywords: N-doped TiO2; mecoprop; clopyralid; photocatalysis; visible; UV light N-doped TiO2; mecoprop; clopyralid; photocatalysis; visible; UV light
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Šojić, D.; Despotović, V.; Abramović, B.; Todorova, N.; Giannakopoulou, T.; Trapalis, C. Photocatalytic Degradation of Mecoprop and Clopyralid in Aqueous Suspensions of Nanostructured N-doped TiO2. Molecules 2010, 15, 2994-3009.

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