...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Mechanistic and Kinetic Understanding of the UV_(254) Photolysis of Chlorine and Bromine Species in Water and Formation of Oxyhalides
【24h】

Mechanistic and Kinetic Understanding of the UV_(254) Photolysis of Chlorine and Bromine Species in Water and Formation of Oxyhalides

机译：UV_（254）对水中氯和溴种类的紫外线（254）的机械和动力学理解及氧合的形成

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

This study investigated the UV_(254) photolysis of free available chlorine and bromine species in water. The intrinsic quantum yields for ~•OH and X~• (X = Cl or Br) generation were determined by model fitting of formaldehyde formation using a tert-butanol assay to be 0.61/0.45 for HOCl/OCl~- and 0.32/0.43 for HOBr/OBr~-. The steady-state ~•OH concentration in UV/ HOX was higher than that in UV/OX~- by a factor of 23.3 and 7.8 for Cl and Br, respectively. This was attributed to the different ~•OH consumption rate by HOCl versus Ocl~-, while for HOBr/ Obr~-, both the ~•OH formation and consumption rates were implied. This was supported by a k of 1.4 × 10~38 M~(-1) s~(-1) for the ~•OH reaction with HOCl, which was >14 times less than the k for ~•OH reactions with Ocl~-, HOBr, and Obr~-. Formation of C1O_3~-and BrO_3~- was found to be significant with apparent quantum yields of 0.12-0.23. A detailed mechanistic study on the formation of XO_3~- including a new pathway involving XO~• is presented, which has important implications as the level of XO_3~- can exceed the regulation (BrO_3~-) or guideline (ClO_3~-) values during UV/halogen oxidant water treatment. Our new kinetic models well simulate the experimental results for the halogen oxidant decomposition, probe compound degradation, and formation of ClO_3~- and BrO_3~- .
机译：本研究研究了在水中的可用氯和溴物质的UV_（254）光解。通过使用叔丁醇测定的甲醛形成的模型配合来确定~~H和X〜•（X = CL或BR）产生的固有量子产率为0.61 / 0.45的HOCl / OCL〜-〜0.32 / 0.43 hobr / obr〜 - 。 UV / Hox中的稳态〜•OH浓度高于UV / OX〜 - Cl和Br的倍数为23.3和7.8。这归因于Hocl与OCL的不同〜•OH消耗率 - ，而对于HOBR / OBR〜 - ，暗示〜•哦形成和消费率。这是由Hocl反应的1.4×10〜38 m〜（-1）〜（-1）的AK的支持，该HOCl的反应~~~~ oON反应的14倍， ，hobr和obr〜 - 。发现C1O_3〜-和Bro_3〜 - 发现表观量子产量为0.12-0.23。对XO_3〜 - 包括涉及XO〜•涉及XO•〜•XO_3〜 - 可以超过调节（BRO_3〜 - ）或指南（CLO_3〜 - ）值的重要意义，具有详细的机械研究。在UV /卤素氧化剂水处理期间。我们的新动态模型井模拟了卤素氧化分解，探针的实验结果，探针复合劣化，以及ClO_3〜 - 和Bro_3〜 - 的形成。

著录项

  • 来源
    《Environmental Science & Technology》 |2020年第18期|11546-11555|共10页
  • 作者

    Woorim Lee; Yuri Lee; Sebastien Allard; Jiwoon Ra; Seunghee Han; Yunho Lee;

  • 作者单位

    School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea;

    School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea;

    Department of Chemistry Curtin University Perth Western Australia 6845 Australia;

    School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea;

    School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea;

    School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea;

  • 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