Department of Chemistry, Faculty of Science, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia.
Molecules. 2010 Apr 27;15(5):2994-3009. doi: 10.3390/molecules15052994.
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.
该工作描述了掺杂和未掺杂锐钛矿 TiO(2) 以及 TiO(2) Degussa P25 悬浮液的氧化能力研究，用于光催化降解除草剂 RS-2-(4-氯-o-甲苯氧基)丙酸（麦草畏）和 3,6-二氯-吡啶-2-羧酸（氯吡咯酸）。未掺杂的锐钛矿纳米结构 TiO(2) 粉末通过溶胶-凝胶途径制备。合成的 TiO(2) 以及 TiO(2) Degussa P25 粉末用尿素改性以将氮引入结构中。当使用可见光降解麦草畏时，掺杂氮的 TiO(2) 似乎比起始 TiO(2)（锐钛矿）粉末更有效。掺杂氮的 TiO(2) Degussa P25 也比 TiO(2) Degussa P25 稍微有效。然而，在相同的实验条件下，在任何提到的催化剂存在下，都没有观察到氯吡咯酸的降解。当使用紫外光研究麦草畏降解的动力学时，未掺杂的粉末更有效，而对于氯吡咯酸，掺杂氮的 TiO(2) Degussa P25 粉末最有效，这可能是两种除草剂分子结构差异的结果。
