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首页> 外文期刊>Environmental Science & Technology >Formation of Light Absorbing Soluble Secondary Organics and Insoluble Polymeric Particles from the Dark Reaction of Catechol and Guaiacol with Fe(Ⅲ)
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Formation of Light Absorbing Soluble Secondary Organics and Insoluble Polymeric Particles from the Dark Reaction of Catechol and Guaiacol with Fe(Ⅲ)

机译：邻苯二酚和愈创木酚与Fe（Ⅲ）的暗反应形成吸光的可溶性二级有机物和不溶性聚合物颗粒

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摘要

Transition metals such as iron are reactive components of environmentally relevant surfaces. Here, dark reaction of Fe(Ⅲ) with catechol and guaiacol was investigated in an aqueous solution at pH 3 under experimental conditions that mimic reactions in the adsorbed phase of water. Using UV-vis spectroscopy, liquid chromatography, mass spectrometry, elemental analysis, dynamic light scattering, and electron microscopy techniques, we characterized the reactants, intermediates, and products as a function of reaction time. The reactions of Fe(Ⅲ) with catechol and guaiacol produced significant changes in the optical spectra of the solutions due to the formation of light absorbing secondary organics and colloidal organic particles. The primary steps in the reaction mechanism were shown to include oxidation of catechol and guaiacol to hydroxy- and methoxy-quinones. The particles formed within a few minutes of reaction and grew to micron-size aggregates after half an hour reaction. The mass-normalized absorption coefficients of the particles were comparable to those of strongly absorbing brown carbon compounds produced by biomass burning. These results could account for new pathways that lead to atmospheric secondary organic aerosol formation and abiotic polymer formation on environmental surfaces mediated by transition metals.
机译：过渡金属（例如铁）是与环境相关的表面的反应性组分。在此，在模拟pH值的水吸附相的实验条件下，在pH为3的水溶液中研究了Fe（Ⅲ）与邻苯二酚和愈创木酚的暗反应。使用紫外可见光谱，液相色谱，质谱，元素分析，动态光散射和电子显微镜技术，我们将反应物，中间体和产物表征为反应时间的函数。 Fe（Ⅲ）与邻苯二酚和愈创木酚的反应在溶液的光谱中产生了显着变化，这是由于形成了吸收光的次级有机物和胶体有机颗粒。已表明反应机理中的主要步骤包括将邻苯二酚和愈创木酚氧化为羟基和甲氧基醌。反应几分钟后形成颗粒，反应半小时后生长成微米级的聚集体。颗粒的质量归一化吸收系数与强烈吸收通过生物质燃烧产生的褐色碳化合物的质量归一化吸收系数相当。这些结果可能解释了导致过渡金属介导的环境表面上大气次级有机气溶胶形成和非生物聚合物形成的新途径。

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  • 来源
    《Environmental Science & Technology》 |2015年第13期|7793-7801|共9页
  • 作者

    Samantha Slikboer; Lindsay Grandy; Sandra L. Blair; Sergey A. Nizkorodov; Richard W. Smith; Hind A. Al-Abadleh;

  • 作者单位

    Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada,Department of Chemistry and Chemical Biology, McMaster University;

    Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada;

    Department of Chemistry, University of California, Irvine, California 92697, United States;

    Department of Chemistry, University of California, Irvine, California 92697, United States;

    University of Waterloo Mass Spectrometry Facility, Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;

    Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada;

  • 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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