...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Simulated Solar Light Phototransformation of Organophosphorus Azinphos Methyl at the Surface of Clays and Goethite
【24h】

Simulated Solar Light Phototransformation of Organophosphorus Azinphos Methyl at the Surface of Clays and Goethite

机译：粘土和针铁矿表面模拟有机磷谷硫磷的太阳光光转化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The photochemical behavior of the pesticide azinphos methyl at the surface of clays (kaolinite, bentonite) and goethite was studied using Suntest setup (λ > 300 nm). The quantum yield on the clays was found to be roughly three times lower than that in aqueous solution. However, the photochemical efficiency was much higher at the surface of goethite owing to its photocatalytic activity through the hydroxyl radical production. The added humic substances on kaolonite show an inhibition of azinphos methyl degradation while the incorporation of iron(Ⅲ) aquacomplexes leads to an important increase of the disappearance together with the formation of iron(Ⅱ). Hydroxyl radical species were found to be formed either by excitation of goethite or clays. The goethite support acts as a more efficient catalyst for the formation of these reactive oxygen species. The photodecomposition reactions observed were (ⅰ) hydrolysis process leading to the formation of benzotriazone and the oxidation of the P = S bond giving rise to the formation of the oxon derivative, and (ⅱ) homolytic cleavage of the N-C and C-S bonds of the organophosphorus bridge leading to the formation of dimers that appear to be specific to the irradiation at the surface of solid supports since they were not observed when the irradiation was performed in aqueous media: a statement that is related to the presence of aggregates at the surface of solid supports.
机译：使用Suntest装置（λ> 300 nm）研究了农药谷硫磷甲基在粘土（高岭石，膨润土）和针铁矿表面的光化学行为。发现在粘土上的量子产率比水溶液中的量子产率低大约三倍。然而，由于针铁矿通过产生羟基自由基的光催化活性，在针铁矿表面的光化学效率要高得多。高岭石上添加的腐殖质物质抑制了谷硫磷的降解，而铁（Ⅲ）水络合物的引入导致消失的增加以及铁（Ⅱ）的形成。发现羟基自由基物质是通过针铁矿或粘土的激发而形成的。针铁矿载体充当形成这些活性氧物质的更有效的催化剂。观察到的光分解反应是（ⅰ）水解过程导致形成苯并三氮杂and和P = S键的氧化导致形成氧derivative衍生物，以及（ⅱ）均相裂解有机磷的NC和CS键。导致形成二聚体的桥，该二聚体似乎对固体支持物表面的辐照具有特异性，因为在水性介质中进行辐照时未观察到它们：与固体表面存在聚集体有关的陈述支持。

著录项

  • 来源
    《Environmental Science & Technology》 |2013年第2期|765-772|共8页
  • 作者

    Matthieu Menager; Mohamed Sarakha;

  • 作者单位

    CIermont Universite, Universite Blaise Pascal, ICCF UMR CNRS 6296, equipe de Photochimie, BP 80026, F-63171 Aubiere Cedex,France;

    CNRS, UMR 6296, ICCF, BP 80026, F-63171 Aubiere, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号