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Quantitative High-Resolution Mapping of Phenanthrene Sorption to Black Carbon Particles

机译：菲吸附到黑碳颗粒的高分辨率定量映射

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摘要

Sorption of hydrophobic organic contaminants such as polycydic aromatic hydrocarbons (PAHs) to black carbon (BC) particles has been the focus of numerous studies. Conclusions on sorption mechanisms of PAH on BC were mostly derived from studies of sorption isotherms and sorption kinetics, which are based on batch experiments. However, mechanistic modeling approaches consider processes at the subparticle scale, some including transport within the pore-space or different spatial pore-domains. Direct evidence based on analytical techniques operating at the submicrometer scale for the location of sorption sites and the adsorbed species is lacking. In this work, we identified, quantified, and mapped the sorption of PAHs on different BC particles (activated carbon, charcoal and diesel soot) on a 25—100 run scale using scanning transmission X-ray microscopy (STXM). In addition, we visualized the pore structure of the particles by transmission electron microscopy (TEM) on the 1-10 nm-scale. The combination of the chemical information from STXM with the physical information from TEM revealed that phenanthrene accumulates in the interconnected pore-system along primary "cracks" in the particles, confirming an adsorption mechanism.
机译：疏水性有机污染物（例如多环芳烃（PAH））吸附到黑碳（BC）颗粒上已成为众多研究的重点。 PAH在BC上的吸附机理的结论主要来自于吸附等温线和吸附动力学的研究，这些研究是基于分批实验的。但是，机械建模方法考虑了亚粒子尺度的过程，其中一些过程包括在孔隙空间或不同空间孔隙域内的传输。缺乏基于分析技术的亚微米尺度上的吸附点和被吸附物质的位置的直接证据。在这项工作中，我们使用扫描透射X射线显微镜（STXM）以25-100的运行规模鉴定，量化并绘制了PAHs在不同BC颗粒（活性炭，木炭和柴油机烟灰）上的吸附量。此外，我们通过透射电子显微镜（TEM）在1-10 nm规模上可视化了颗粒的孔结构。来自STXM的化学信息与来自TEM的物理信息的结合表明，菲沿着颗粒中的主要“裂纹”堆积在相互连接的孔系统中，从而确认了吸附机理。

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  • 来源
    《Environmental Science & Technology》 |2011年第17期|p.7314-7322|共9页
  • 作者

    Martin Obst; Peter Grathwohl; Andreas Kappler; Oliver Eibl; Nicola Peranio; Tilman Gocht;

  • 作者单位

    Center for Applied Geoscience, Eberhard Karls University Tuebingen, Holderlinstr. 12, 72074 Tuebingen, Germany;

    Center for Applied Geoscience, Eberhard Karls University Tuebingen, Holderlinstr. 12, 72074 Tuebingen, Germany;

    Center for Applied Geoscience, Eberhard Karls University Tuebingen, Holderlinstr. 12, 72074 Tuebingen, Germany;

    Institute for Applied Physics, Eberhard Karls University Tuebingen, Auf der Morgenstelle 10, 72076 Tuebingen, Germany;

    Institute for Applied Physics, Eberhard Karls University Tuebingen, Auf der Morgenstelle 10, 72076 Tuebingen, Germany;

    Center for Applied Geoscience, Eberhard Karls University Tuebingen, Holderlinstr. 12, 72074 Tuebingen, Germany;

  • 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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