Photocatalytic degradation of mecoprop and clopyralid in aqueous suspensions of nanostructured N-doped TiO2.

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Daniela V SojićChristos Trapalis

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 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 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.

References

Jun 13, 2001·Journal of Environmental Quality·L Clausen, I Fabricius
Oct 28, 2003·Angewandte Chemie·Shanmugasundaram Sakthivel, Horst Kisch
Aug 10, 2007·Environmental Health Perspectives·David B DonaldNancy E Glozier

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Citations

Apr 3, 2012·Environmental Science and Pollution Research International·T I NkambuleB B Mamba
Feb 27, 2016·Environment International·P Anil Kumar ReddySudhakar Kalagara
Dec 16, 2011·Journal of Hazardous Materials·Agatino Di PaolaLeonardo Palmisano
Dec 16, 2011·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Enrico Mendes SaggioroJosino Costa Moreira
Dec 4, 2019·Environmental Science and Pollution Research International·Paweł MuszyńskiTadeusz Paszko
Jan 24, 2021·Environmental Science and Pollution Research International·Mostafa HadeiKazem Naddafi

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Methods Mentioned

BETA
X-ray
thermal treatment
ionic chromatography

Software Mentioned

Hyperchem

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