Homogeneous oxidation of aqueous solutions of atrazine and fenitrothion through dark and photo-Fenton reactions.
Homogeneous oxidation of aqueous solutions of atrazine and fenitrothion through dark and photo-Fenton reactions.
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DOI：
10.1016/j.chemosphere.2008.10.008
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发表时间：
2009-02
期刊：
影响因子：
8.8
通讯作者：
D. Kassinos;N. Varnava;C. Michael;P. Piera
中科院分区：
文献类型：
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作者：
D. Kassinos;N. Varnava;C. Michael;P. Piera
以Fe（II）为催化剂，H2 O2为氧化剂，在黑暗和光照条件下，研究了莠去津和杀螟松在纯水中的均相催化氧化行为.结果表明，在黑暗的芬顿反应过程中的降解发生在第一个2 h，并进一步延长反应时间不会导致增强的去除。这同样适用于光驱动的反应。在光Fenton反应条件下，杀螟松被完全矿化，而阿特拉津溶液中的TOC去除率为57%。当在单含溶液和其二元混合物中时，两种化合物以其母体形式从氧化的前5分钟完全消除。阿特拉津溶液中TOC的氧化遵循两阶段二级动力学行为，这归因于氧化过程中发生的复杂反应途径;杀螟松溶液中TOC的氧化遵循准一级动力学行为，二元混合物的氧化遵循两阶段降解动力学行为。研究结果表明，光驱动芬顿氧化法可以有效去除受污染沃茨中的莠去津，尤其是杀螟硫磷。
The homogeneous catalytic oxidation of atrazine and fenitrothion in single compound-containing solutions and in mixture, in pure water, was investigated in dark and light-driven oxidation systems using H2O2as the oxidant and Fe(II) as the catalyst. It was shown that the degradation during the dark Fenton reactions takes place during the first 2h and further prolongation of the reaction time does not lead to enhanced removals. The same holds true for the light-driven reactions. With the photo-Fenton reaction, fenitrothion was completely mineralized while the TOC contained in the atrazine solution was removed by 57%. Both compounds in their parent form were completely eliminated from the first 5min of the oxidation both when being in the single-containing solutions and in their binary mixture. The oxidation of the TOC in the atrazine solution follows a two-stage second-order kinetic behavior which is attributed to the complex reaction pathways occurring during the oxidation while that of the TOC in the fenitrothion solutions follows a pseudo-first order degradation kinetic and that of binary mixture a two-stage degradation kinetics. The results obtained in this study, clearly indicate that the light-driven Fenton oxidation can be very efficient for the removal of atrazine and especially fenitrothion from polluted waters.