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首页> 外文期刊>The Science of the Total Environment >Photochemical degradation of polyhalogenated carbazoles in hexane by sunlight
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Photochemical degradation of polyhalogenated carbazoles in hexane by sunlight

机译：阳光下己烷中多卤代菌毒物的光化学降解

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摘要

Polyhalogenated carbazoles (PHCZs) are a class of halogenated dibenzopyrrole, which have been increasingly detected in the environment and found to be bioaccumulative and potentially toxic. However, their environmental transformation potential is largely unknown. In this study, UV absorption spectra of carbazole (CZ) and 10 PHCZs were obtained with wavelength range 290-400 nm, and three peaks were identified in most cases with the highest occurring around 300 nm. Hexane solutions of CZ, 10 individual PHCZs, and a sediment extract containing nine other PHCZs were separately irradiated under natural sunlight in order to investigate their photodegradation kinetics and pathways. The pseudo-first-order reaction rate constants (k) of these PHCZs varied from 0.183 h(-1) to 2.394 h(-1), and increased exponentially with increasing numbers of chlorines and bromines in PHCZ molecules. Contribution to ln k from each bromine atom is more than doubling of that from each chlorine atom. Stepwise reduction debromination was confirmed to be one of the photodegradation mechanisms for both brominated and mixed halogenated (containing both bromine and chlorine) carbazoles. Only sporadic dechlorinated products were found during the photolysis of chlorinated carbazoles. By adopting a simplified kinetic approach, we estimated that dehalogenation contributed approximately 20% to 51% of the total loss of the parent PHCZs. (C) 2019 Elsevier B.V. All rights reserved.
机译：多卤代咔唑（PHCZ）是一类卤代二苯并泡，在环境中越来越多地检测到，发现是生物累积性和潜在的毒性。然而，它们的环境转化潜力在很大程度上是未知的。在该研究中，通过波长范围为290-400nm获得咔唑（CZ）和10PHCZ的UV吸收光谱，并且在大多数情况下鉴定了三个峰值，最高发生约300nm。在天然阳光下单独照射CZ，10个单独pHCZ的己烷溶液和含有九种其他PHCZ的沉积物提取物，以研究它们的光降解动力学和途径。这些PHCZ的伪一级反应速率常数（K）在0.183h（-1）至2.394h（-1）中不同，并且随着越来越多的氯和pHCZ分子中的溴化溴而导数。来自每个溴原子的Ln K的贡献远远超过每氯原子的加倍。证实逐步减少脱溴是溴化和混合卤化（含溴和氯）咔唑的光降解机制之一。在氯化咔唑的光解期间发现了零摩尔类脱氯产品。通过采用简化的动力学方法，我们估计脱卤有约20％至51％的亲本PHCZ的总损失。 （c）2019 Elsevier B.v.保留所有权利。

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  • 来源
    《The Science of the Total Environment》 |2019年第25期|622-631|共10页
  • 作者

    Zhou Shanshan; Pan Xiaoxue; Tang Qiaozhi; Zhu Hongbin; Zhou Jiayi; Zhao Lu; Guo Jiehong; Wang Zunyao; Liu Weiping; Li An;

  • 作者单位

    Zhejiang Univ Technol Coll Environm 18 Chaowang Load Hangzhou 310014 Zhejiang Peoples R China|Univ Illinois Sch Publ Hlth Chicago IL 60612 USA;

    Univ Illinois Sch Publ Hlth Chicago IL 60612 USA|Nanjing Univ Sch Environm Nanjing 210093 Jiangsu Peoples R China;

    Univ Illinois Sch Publ Hlth Chicago IL 60612 USA|Zhejiang Univ Coll Environm & Resource Sci Hangzhou 310058 Zhejiang Peoples R China;

    Zhejiang Univ Technol Coll Environm 18 Chaowang Load Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Coll Environm 18 Chaowang Load Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Coll Environm & Resource Sci Hangzhou 310058 Zhejiang Peoples R China;

    Univ Illinois Sch Publ Hlth Chicago IL 60612 USA;

    Nanjing Univ Sch Environm Nanjing 210093 Jiangsu Peoples R China;

    Zhejiang Univ Coll Environm & Resource Sci Hangzhou 310058 Zhejiang Peoples R China;

    Zhejiang Univ Technol Coll Environm 18 Chaowang Load Hangzhou 310014 Zhejiang Peoples R China|Univ Illinois Sch Publ Hlth Chicago IL 60612 USA|Zhejiang Univ Coll Environm & Resource Sci Hangzhou 310058 Zhejiang Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Polyhalogenated carbazoles; Photolysis; Natural light; Hexane;

    机译：多卤代毒品;光解;自然光;己烷;

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