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首页> 外文期刊>Environmental Science & Technology >Reactivity of Chlorine Radicals (Cl~· and Cl_2~(·-)) with Dissolved Organic Matter and the Formation of Chlorinated Byproducts
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Reactivity of Chlorine Radicals (Cl~· and Cl_2~(·-)) with Dissolved Organic Matter and the Formation of Chlorinated Byproducts

机译：氯自由基的反应性（Cl〜·和Cl_2〜（· - ））溶解有机物和氯化副产物的形成

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摘要

Chlorine radicals, including Cl~· and Cl_2~(·-) , can be produced in sunlight waters (rivers, oceans, and lakes) or water treatment processes (e.g., electrochemical and advanced oxidation processes). Dissolved organic matter (DOM) is a major reactant with, or a scavenger of, Cl~· and Cl_2~(·-) in water, but limited quantitative information exists regarding the influence of DOM structure on its reactivity with Cl~· and Cl_2~(·-). This study aimed at quantifying the reaction rates and the formation of chlorinated organic byproducts produced from Cl~· and Cl_2~(·-) reactions with DOM. Laser flash photolysis experiments were conducted to quantify the second-order reaction rate constants of 19 DOM isolates with Cl~· (k_(DOM-Cl·)) and Cl_2~(·-) (k_(DOM-Cl2·-))，and compare those with the hydroxyl radical rate constants (k_(DOM-·OH). The values for k_(DOM-Cl·) ((3.71 ± 0.34) × 10~8 to (1.52 ± 1.56) × 109 M_c~(-1) s~(-1)) were orders of magnitude greater than the k_(DOM-Cl2·-) values ((4.60 ± 0.90) × 10~6 to (3.57 ± 0.53) × 107 M_C~(-1) s~(-1)). k_(DOM-Cl·) negatively correlated with the weight-averaged molecular weight (M_w) due to the diffusion-controlled reactions. DOM with high aromaticity and total antioxidant capacity tended to react faster with Cl_2~(·-). During the same experiments, we also monitored the formation of chlorinated byproducts through the evolution of total organic chlorine (TOCl) as a function of chlorine radical oxidant exposure (CT value). Maximum TOCl occurred at a CT of 4-8 × 10~(-12) M·s for Cl~· and 1.1-2.2 × 10~(-10) M·s for Cl-2~(·-). These results signify the importance of DOM in scavenging chlorine radicals and the potential risks of producing chlorinated byproducts of unknown toxicity.
机译：氯自由基，含Cl〜·和CL_2〜（· - ），可在太阳光的水域（河流，海洋和湖泊）或水处理工艺（例如，电化学和高级氧化法）来制造。溶解的有机物质（DOM）是与主要反应物，或者，氯清除剂〜·和CL_2〜（· - ）的水，但不限定量信息关于DOM结构的其有Cl〜·和CL_2反应性的影响存在〜（· - ）。此研究的目的是定量反应速率和选自Cl〜·和CL_2〜生产氯化有机副产物的形成（· - ）与DOM反应。进行了激光闪光光解实验有Cl量化19 DOM株二阶反应速率常数〜·（K_（DOM-CL·））和CL_2〜（· - ）（K_（DOM-氯气· - ）），和比较那些有羟基自由基的速率常数（K_（DOM-·OH）的值K_（DOM-CL·）（（3.71±0.34）×10 -8至（1.52±1.56）×109 M_C〜（ - 1）S〜（-1））为量级大的比K_（DOM-氯气订单· - ）的值（（4.60±0.90）×10 -6至（3.57±0.53）×107 M_C〜（-1）类〜（-1））。K_（DOM-CL·）与所述负相关重均分子量（M_W）由于扩散控制反应。DOM具有高芳香性和总抗氧化能力趋向于更快地CL_2〜反应（ · - 。）。在相同的实验中，我们还通过总有机氯的演进（TOCL）如氯基团的氧化剂曝光（CT值）的函数监控氯化副产物的形成最大TOCL发生在4-8一CT ×10〜（-12）M·s的用于氯〜·和1.1-2.2×10〜（-10）M·s的用于CL-2〜（· - ），这些ř esults表示在清除氯自由基和生产毒性未知的氯化副产物的潜在风险DOM​​的重要性。

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  • 来源
    《Environmental Science & Technology》 |2021年第1期|689-699|共11页
  • 作者

    Yu Lei; Xin Lei; Paul Westerhoff; Xinran Zhang; Xin Yang;

  • 作者单位

    School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou 510275 China;

    School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou 510275 China;

    School of Sustainable Engineering and the Built Environment Arizona State University Tempe Arizona 85287-3005 United States;

    School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou 510275 China;

    School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou 510275 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

    chlorine radicals; dissolved organic matter; reaction rate constants; chlorinated byproducts;

    机译：氯自由基;溶解有机物;反应率常数;氯化副产品;

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