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首页> 外文期刊>Environmental Science & Technology >Rotating Ring-Disk Electrode and Quantum-Chemical Study of the Electrochemical Reduction of Monoiodoacetic Acid and lodoform
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Rotating Ring-Disk Electrode and Quantum-Chemical Study of the Electrochemical Reduction of Monoiodoacetic Acid and lodoform

机译：旋转圆盘电极和单碘乙酸和碘仿电化学还原的量子化学研究

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摘要

This study examined the electrochemical (EC) reduction of monoiodoacetic add (MIAA) and iodoform (CHI_3), which are typical iodine-containing disinfection byproducts (Ⅰ-DBPs). Experiments carried out using the method of a rotating ring-disk electrode (RRDE) with a gold working electrode showed that the reduction of CHI_3 and MIAA is diffusion-controlled. The MIAA diffusion coefficient was determined to be (1.86 ± 0.24)·10~(-5) cm~2 s~(-1). The yield of the iodide ion formed as a result of MIAA or CHI, reduction was affected by the presence of dissolved organic matter (DOM) and resordnol. Increasing concentrations of DOM or resordnol did not affect the EC reduction of the examined I-DBPs, but the formation of iodide was suppressed. This indicated that free iodine, •I, was formed as a result of the first step in the EC reduction of MIAA and CHI_3. This also indicated that the pathway of the EC reduction of MIAA and CHI_3 was different from that typical for the reduction of Br- and Cl-containing DBPs, in which case Br~- or Cl~- tend to be formed as a result of the electron transfer. Quantum-chemical (QC) calculations confirmed the thermodynamic likelihood of and possible preference to the formation of free iodine species as a result of the EC reduction of MIAA, CHI_3, and other Ⅰ-DBPs.
机译：本研究研究了单碘碘添加物（MIAA）和碘仿（CHI_3）的电化学（EC）还原，它们是典型的含碘消毒副产物（Ⅰ-DBPs）。使用带有金工作电极的旋转环形盘电极（RRDE）的方法进行的实验表明，CHI_3和MIAA的还原是受扩散控制的。测得的MIAA扩散系数为（1.86±0.24）·10〜（-5）cm〜2 s〜（-1）。 MIAA或CHI还原形成的碘离子的收率受到溶解有机物（DOM）和间苯二酚的影响。 DOM或间苯二酚浓度的增加不会影响所检测的I-DBPs的EC降低，但碘化物的形成受到抑制。这表明由于EC降低MIAA和CHI_3的第一步，形成了游离碘I。这也表明EC减少MIAA和CHI_3的途径不同于减少含Br-和Cl的DBP的典型途径，在这种情况下，由于电子转移。量子化学（QC）计算证实了ECAA降低MIAA，CHI_3和其他Ⅰ-DBPs导致形成游离碘的热力学可能性，并且可能更倾向于形成游离碘。

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  • 来源
    《Environmental Science & Technology》 |2015年第22期|13542-13549|共8页
  • 作者

    Jing Ma; Mingquan Yan; Andrey M. Kuznetsov; Aleksey N. Masliy; Guodong Ji; Gregory V. Korshin;

  • 作者单位

    Department of Environmental Engineering, College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing 100871, China;

    Department of Environmental Engineering, College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing 100871, China;

    Department of Inorganic Chemistry, Kazan National Research Technological University, K. Marx Street 68, Tatarstan, Russian Federation 420015;

    Department of Inorganic Chemistry, Kazan National Research Technological University, K. Marx Street 68, Tatarstan, Russian Federation 420015;

    Department of Environmental Engineering, College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing 100871, China;

    Department of Civil and Environmental Engineering, University of Washington, Box 352700, Seattle, Washington 98195-2700, United States;

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