Direct and indirect photolysis of two quinolinecarboxylic herbicides in aqueous systems
Direct and indirect photolysis of two quinolinecarboxylic herbicides in aqueous systems
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DOI：
10.1016/j.chemosphere.2011.11.016
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发表时间：
2012-02-01
期刊：
影响因子：
8.8
通讯作者：
Pusino, Alba
中科院分区：
文献类型：
--
作者：
Pinna, Maria Vittoria;Pusino, Alba
研究了喹啉羧酸类除草剂7-氯-3-甲基喹啉-8-羧酸（QMe）和3，7-二氯喹啉-8-羧酸（QCI）在水溶液中在不同波长下的光降解。还研究了在二氧化钛（TiO 2）存在下太阳光照射的效果。紫外光照射快速降解QMe，通过脱羧反应得到7-氯-3-甲基喹啉（MeQ）。溶解有机碳（DOC）的存在下，由于除草剂的有机组分的吸附，反应速率较低。相反，QCI在UV光和日光照射下都是稳定的。在TiO 2存在下，用模拟阳光照射QMe或QCI溶液产生两种除草剂的完全矿化。(C)2011爱思唯尔有限公司版权所有。
The photodegradation of two quinolinecarboxylic herbicides, 7-chloro-3-methylquinoline-8-carboxylic acid (QMe) and 3,7-dichloroquinoline-8-carboxylic acid (QCI), was studied in aqueous solution at different irradiation wavelengths. The effect of sunlight irradiation was investigated also in the presence of titanium dioxide (TiO2). UV irradiation degraded rapidly QMe affording 7-chloro-3-methylquinoline (MeQ) through a decarboxylation reaction. The reaction rate was lower in the presence of dissolved organic carbon (DOC) because of the adsorption of the herbicide on the organic components. Instead, QCI was stable under both UV light and sunlight irradiation. The irradiation of QMe or QCI solutions with simulated sunlight in the presence of TiO2 produced the complete mineralization of the two herbicides. (C) 2011 Elsevier Ltd. All rights reserved.