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Photocatalytic degradation of hexazinone and its determination in water via UPLC-MS/MS

机译：六嗪酮的光催化降解及其在水中的UPLC-MS / MS测定

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摘要

Degradation of hexazinone has been investigated by means of photocatalysis of mixed-phase crystal nano-TiO_2. Influences of adsorption, amount of nano-TiO_2, pH and irradiation time on the photocatalytic process are studied. Results show that hexazinone is totally degraded within 40 min of irradiation under pH neutral conditions. This compares favorably with Degussa P25 TiO_2 when conducted under the same experimental conditions. Preliminary photocatalytic kinetic information for hexazinone degradation is proposed. First order kinetics is obtained for the adsorption and photocatalytic degradation reactions, which fit the Langmuir-Hinshelwood model. A rapid, sensitive and accurate UPLC-MS/MS technique is developed and utilized to determine the level of hexazinone in water in support of the degradation kinetics study. The results indicate a limit of detection (LOD) at 0.05 μg/l and the recoveries between 90.2 and 98.5% with relative standard deviations (RSD) lower than 12%, A LC-MS/MS technique is used to trace the degradation process. Complete degradation is achieved into final products including nontoxic water, carbon dioxide and urea. A probable pathway for the total photocatalytic degradation of hexazinone is proposed.
机译：已经通过光催化混合相晶体纳米TiO_2研究了六嗪酮的降解。研究了吸附量，纳米TiO_2含量，pH值和辐照时间对光催化过程的影响。结果表明，在pH中性条件下，六嗪酮在辐射后40分钟内完全降解。在相同的实验条件下进行测试时，这与Degussa P25 TiO_2相比具有优势。提出了初步的光催化动力学信息的六嗪酮降解。对于吸附和光催化降解反应，获得了一级动力学，符合Langmuir-Hinshelwood模型。开发了一种快速，灵敏且准确的UPLC-MS / MS技术，并用于确定水中的六嗪酮含量，以支持降解动力学研究。结果表明检出限（LOD）为0.05μg/ l，回收率在90.2至98.5％之间，相对标准偏差（RSD）低于12％，采用LC-MS / MS技术追踪降解过程。可以完全降解为最终产品，包括无毒的水，二氧化碳和尿素。提出了一种可能的途径对六嗪酮进行全光催化降解。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.100-108|共9页
  • 作者

    Mei Mei; Zhenxia Du; Ruifen Xu; Yun Chen; Haojie Zhang; Shuping Qu;

  • 作者单位

    College of Science, Beijing University of Chemical Technology, Beijing, China;

    College of Science, Beijing University of Chemical Technology, Beijing, China;

    JiangSu KaoPuLe New Material Co., Ltd.Jiangsu. China;

    College of Science, Beijing University of Chemical Technology, Beijing, China;

    College of Science, Beijing University of Chemical Technology, Beijing, China;

    College of Science, Beijing University of Chemical Technology, Beijing, China;

  • 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

    photocatalytic degradation; mixed-phase crystal nano-TiO_2; UPLC-MS/MS; hexazinone;

    机译：光催化降解;混合相晶体纳米TiO_2;UPLC-MS / MS;六嗪酮;

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