title: Photocatalytic degradation of mecoprop and clopyralid in aqueous suspensions of nanostructured N-doped TiO2.
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.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia. daniela.sojic@dh.uns.ac.rs
authors.forename: Daniela
authors.initials: D
authors.lastname: Sojić
authors.forename: Vesna
authors.initials: V
authors.lastname: Despotović
authors.forename: Biljana
authors.initials: B
authors.lastname: Abramović
authors.forename: Nadia
authors.initials: N
authors.lastname: Todorova
authors.forename: Tatiana
authors.initials: T
authors.lastname: Giannakopoulou
authors.forename: Christos
authors.initials: C
authors.lastname: Trapalis
mesh_terms: D008456:2-Methyl-4-chlorophenoxyacetic Acid / Q000031:analogs & derivatives* / Q000737:chemistry / Q000528:radiation effects; D002384:Catalysis; D052918:Environmental Restoration and Remediation / Q000379:methods; D006540:Herbicides / Q000737:chemistry* / Q000528:radiation effects; D049329:Nanostructures / Q000737:chemistry; D010782:Photolysis; D010848:Picolinic Acids / Q000737:chemistry* / Q000528:radiation effects; D013535:Suspensions; D014025:Titanium / Q000737:chemistry*
chemical_list: D006540:Herbicides; D010848:Picolinic Acids; D013535:Suspensions; C011767:clopyralid; C009495:titanium dioxide; C008340:mecoprop; D014025:Titanium; D008456:2-Methyl-4-chlorophenoxyacetic Acid