ADVANCED OXIDATION OF 2, 4- DICHLOROPHENOXYACETIC ACID AND DECOMPOSITION PRODUCTS

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  • 2, 4-ジクロロフェノキシ酢酸の促進酸化分解による副生成物質の生成挙動
  • 2,4-ジクロロフェノキシ サクサン ノ ソクシン サンカ ブンカイ ニ ヨル フクセイセイ ブッシツ ノ セイセイ キョドウ

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Abstract

<p> 2, 4-dichlorophenoxyacetic acid (2, 4-D) is persistent in water environment and harmful to human body. It is reported that 2, 4-D in aqueous solution can be decomposed by the advanced oxidation process (AOP). However, no clear experimental results have been reported on the decomposition mechanism of 2, 4-D.</p><p> This paper aims to unveil the decomposition mechanism of 2, 4-D by advanced oxidation process using H2O2, O3 and UV in laboratory batch experiments. We reported previously that H2O2/O3/UV and H2O2/UV systems are able to generate hydroxyl radical efficiently.</p><p> The results of experiment show that 2, 4-D could be decomposed rapidly by the action of hydroxyl radical generated in H2O2/O3/UV and H2O2/UV systems. In this case, dechlorination and degradation of 2, 4-D occurred simultaneously due to non-selective decomposition. On the other hand, selective decomposition without hydroxyl radical was occurred slowly with mineralization of 2, 4-D. In addition, the mineralization pathways of 2, 4-D were estimated from the performance of several decomposition products analyzed by LC/MS/MS and others.</p>

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