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首页> 外文期刊>Environmental Science & Technology >Revelation of Fe(Ⅴ)/Fe(Ⅳ) Involvement in the Fe(Ⅵ)-ABTS System: Kinetic Modeling and Product Analysis
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Revelation of Fe(Ⅴ)/Fe(Ⅳ) Involvement in the Fe(Ⅵ)-ABTS System: Kinetic Modeling and Product Analysis

机译:Fe(ⅴ)/ fe(ⅳ)参与Fe(ⅵ)/ fe(ⅵ)-abts系统的启示:动力学建模和产品分析

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摘要

To quantitatively probe iron intermediate species [Fe(Ⅴ)/ Fe(Ⅳ)] in Fe(Ⅵ) oxidation, this study systematically investigated the reaction kinetics of Fe(Ⅵ) oxidation of 2,2′-azino-bis(3-ethylbenzothiazoline- 6-sulfonic)acid (ABTS) at different ratios of [ABTS]_0/[Fe(Ⅵ)]_0 (i.e., >1.0, = 1.0, and <1.0) in pH 7.0 phosphate (10 mM)-buffered solution. Compared to the literature, a more comprehensive and robust kinetic model for the Fe(Ⅵ)-ABTS system including interactions between high-valent iron species [Fe(Ⅵ), Fe(Ⅴ), and Fe(Ⅳ)], ABTS, and the ABTS~(·+) radical was proposed and validated. The oxidation of ABTS by Fe(Ⅵ) (k = (5.96 ± 0.9%) × 10~5 M~(-1) s~(-1)), Fe(Ⅴ) (k = (2.04 ± 0.0%) × 10~5 M~(-1) s~(-1)), or Fe(Ⅳ) (k = (4.64 ± 13.0%) × 10~5 M~(-1) s~(-1)) proceeds via one-electron transfer to generate ABTS~(·+), which is subsequently oxidized by Fe(Ⅴ) (k = (8.5 ± 0.0%) × 10~2 M~(-1) s~(-1)), Fe(Ⅴ) (k = (1.0 ± 40.0%) × 10~5 M~(-1) s~(-1)), or Fe(Ⅳ) (k = (1.9 ± 17.0%) × 10~3 M~(-1) s~(-1)), respectively, via two-electron (oxygen atom) transfer to generate colorless ABTS_(ox). At [ABTS]_0/[Fe(Ⅵ)]_0 > 1.0, experimental data and model simulation both indicated that the reaction stoichiometric ratio of Fe(Ⅵ)/ABTS~(·+) increased from 1.0:1.0 to 1.0:1.2 as [ABTS]_0 was increased. Furthermore, the Fe(Ⅵ)- ABTS-substrate model was developed to successfully determine reactivity of Fe(Ⅴ) to different substrates (k = (0.7-1.42) × 10~6 M~(-1) s~(-1)). Overall, the improved Fe(Ⅵ)-ABTS kinetic model provides a useful tool to quantitatively probe Fe(Ⅴ)/Fe(Ⅳ) behaviors in Fe(Ⅵ) oxidation and gains new fundamental insights.
机译:为了定量探测铁中间物质[Fe(ⅴ)/ Fe(Ⅳ)]在Fe(Ⅵ)氧化中,本研究系统地研究了2,2'-氮杂基团(3-乙基苯并噻唑啉)的Fe(Ⅵ)氧化的反应动力学 - 6-磺酸)酸(ABTS)在pH 7.0磷酸盐(10mm)的pH 7.0磷酸盐(10mm)的溶液中的不同比率(即> 1.0,= 1.0和<1.0)。与文献相比,Fe(ⅵ)-abts系统的更全面且强大的动力学模型,包括高价铁合金[Fe(ⅵ),fe(ⅴ)和fe(ⅳ)],abts和的相互作用提出并验证了ABTS〜(·+)激进。 Fe(ⅵ)(k =(5.96±0.9%)×10〜5 m〜(-1)S〜(-1)),Fe(ⅴ)(k =(2.04±0.0%)× 10〜5 m〜(-1)s〜(-1)),或fe(ⅳ)(k =(4.64±13.0%)×10〜5 m〜(-1)S〜(-1))通过一种电子转移以产生ABTS〜(·+),随后通过Fe(ⅴ)氧化(k =(8.5±0.0%)×10〜2 m〜(-1)s〜(-1)),fe (ⅴ)(k =(1.0±40.0%)×10〜5 m〜(-1)s〜(-1)),或Fe(ⅳ)(k =(1.9±17.0%)×10〜3 m〜 (-1)S〜(-1))分别通过双电子(氧原子)转移以产生无色ABTS_(牛)。在[ABTS] _0 / [Fe(ⅵ)] _ 0> 1.0,实验数据和模型模拟表明,Fe(ⅵ)/ abts〜(·+)的反应化学计量比率从1.0:1.0增加到1.0:1.2 [ABTS] _0增加。此外,开发了Fe(ⅵ) - ABTS-基材模型以成功地确定Fe(ⅴ)对不同底物的反应性(k =(0.7-1.42)×10〜6 m〜(-1)s〜(-1) )。总的来说,改进的Fe(ⅵ)-Abts动力学模型为Fe(ⅵ)氧化中的量(ⅴ)/ fe(ⅳ)行为提供了一种有用的工具,以获得新的基本洞察力。

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  • 来源
    《Environmental Science & Technology》 |2021年第6期|3976-3987|共12页
  • 作者单位

    School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta Georgia 30332 United States;

    School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta Georgia 30332 United States;

    School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta Georgia 30332 United States;

    Department of Environment and Occupational Health School of Public Health Texas A&M University College Station Texas 77843 United States;

    School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta Georgia 30332 United States;

  • 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);
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  • 正文语种 eng
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