Lhomme L, Brosillon S, Wolbert D
Laboratoire Sciences Chimiques de Rennes UMR CNRS 6226/ENSCR/UR1, Equipe CIP, Ecole Nationale Supérieure de Chimie de Rennes, avenue du Général Leclerc, 35700 Rennes, France.
Chemosphere. 2008 Jan;70(3):381-6. doi: 10.1016/j.chemosphere.2007.07.004. Epub 2007 Aug 20.
Heterogeneous photocatalysis of pesticides is an effective process for removing pesticides from pure water. With a view to treating real agricultural effluents, this paper deals with the degradation of the chlortoluron and cyproconazole pesticides in pure water and the treatment of commercial solutions by photocatalysis on TiO2 coated media. The process was effective in degrading and mineralizing the pesticides. The changes of the fate of heteroatoms showed that during irradiation of the chlortoluron and cyproconazole, NH4+ and NO3(-) ions were produced. A release of chloride ions was observed from the beginning of the irradiation and stoichiometry was achieved. The photodegradation of chlortoluton and cyproconazole in commercial solutions was studied. For the degradation of chlortoluton in a commercial solution, the mineralization was completely achieved whereas in the case of the commercial cyproconazole solution, the degradation kinetic was lower. These results highlight the fact that the chemical nature of the additives in the commercial pesticide solutions does significantly affect the degradation yield of the target compound by photocatalysis.
农药的多相光催化是从纯水中去除农药的有效过程。为了处理实际的农业废水，本文研究了百菌清和环丙唑醇农药在纯水中的降解以及在TiO₂涂层介质上通过光催化处理商业溶液的情况。该过程对农药的降解和矿化有效。杂原子的归宿变化表明，在百菌清和环丙唑醇辐照期间，产生了NH₄⁺和NO₃⁻离子。从辐照开始就观察到氯离子的释放，并实现了化学计量。研究了百菌清和环丙唑醇在商业溶液中的光降解。对于商业溶液中百菌清的降解，矿化完全实现，而对于商业环丙唑醇溶液，降解动力学较低。这些结果突出了这样一个事实，即商业农药溶液中添加剂的化学性质确实会显著影响光催化对目标化合物的降解产率。
