Mechanism and efficiency of atrazine degradation under combined oxidation processes
Mechanism and efficiency of atrazine degradation under combined oxidation processes
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DOI：
10.1016/j.apcatb.2005.11.009
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发表时间：
2006-04-18
影响因子：
22.1
通讯作者：
Selli, E
中科院分区：
文献类型：
--
作者：
Bianchi, CL;Pirola, C;Selli, E
研究了20 kHz超声、臭氧氧化、254 nm光解和TiO 2催化降解阿特拉津的机理。臭氧化和三氯甲烷诱导阿特拉津脱烷基化，然后缓慢脱氯，而在254 nm处的直接光解产生非常有效的脱氯。同时超声降解对臭氧氧化和光催化降解都有促进作用，尤其是提高了光催化脱烷基的速率，但对阿特拉津的单分子光解脱氯没有影响。虽然完全阿特拉津矿化不能实现，因为稳定的S-三嗪环氧化，阿特拉津降解和整体解毒，有关的氯化副产品的消失，进行时，在254运行的光解与臭氧化相结合的最高速率。(c)2005 Elsevier B. V.保留所有权利。
The mechanism of atrazine degradation in aqueous phase was investigated under sonalysis at 20 kHz, ozonation, photolysis at 254 nm and photocatalysis in the presence of TiO2, employed either separately or in combination. Ozonation and photocatalysis induced atrazine de-alkylation, followed by slower de-chlorination, while direct photolysis at 254 nm produced very efficient de-chlorination. Simultaneous sonolysis had beneficial effects on ozonation and photocatalysis, especially by increasing the rate of photocatalytic de-alkylation, and no effect on the unimolecular photolytic de-chlorination of atrazine. Although complete atrazine mineralization could not be attained, because of the stability of the s-triazine ring toward oxidation, atrazine degradation and overall detoxification, as related to the disappearance of chlorinated by-products, proceeded at the highest rate when photolysis at 254 run was combined with ozonation. (c) 2005 Elsevier B.V. All rights reserved.