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首页> 外文期刊>Environmental Science & Technology >Measuring and Modeling Adsorption of PAHs to Carbon Nanotubes Over a Six Order of Magnitude Wide Concentration Range
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Measuring and Modeling Adsorption of PAHs to Carbon Nanotubes Over a Six Order of Magnitude Wide Concentration Range

机译：测量和建模六阶数量级宽浓度范围内PAHs对碳纳米管的吸附

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摘要

Understanding the interactions between organic contaminants and carbon nanomaterials is essential for evaluating the materials' potential environmental impact and their application as sorbent. Although a great deal of work has been published in the past years, data are still limited in terms of compounds, concentrations, and conditions investigated. We applied a passive sampling method employing polyoxymethylene (POM-SPE) to gain a better understanding of the interactions between poh/cyclic aromatic hydrocarbons (PAHs) and multiwalled carbon nanotubes (CNTs) over a 6 orders of magnitude wide concentration range. In the low-concentration range (pg-ng L"1), sorption of phenanthrene and pyrene was linear on a nonlogarithmic scale. Here, sorption could thus be described using a single sorption coefficient. Isotherm fits over the entire concentration range showed that (i) monolayer sorption models described the data very well, and (ii) the CNTs sorption capacity was directly related to their surface area. Sorption coefficients for 13 PAHs (11 of which have not been reported to date) were also measured at environmentally relevant low concentrations. No competition seemed to occur in the low-concentration range and sorption affinity was directly related to the solubility of the subcooled liquid of the compounds.
机译：了解有机污染物和碳纳米材料之间的相互作用对于评估材料对环境的潜在影响及其作为吸附剂的应用至关重要。尽管在过去几年中发表了大量工作，但在化合物，浓度和研究条件方面，数据仍然有限。我们应用了采用聚甲醛（POM-SPE）的无源采样方法，以更好地了解在6个数量级的浓度范围内poh /环状芳烃（PAHs）与多壁碳纳米管（CNT）之间的相互作用。在低浓度范围（pg-ng L“ 1）中，菲和pyr的吸附呈非对数线性关系。因此，此处的吸附可以用单个吸附系数来描述。在整个浓度范围内的等温线拟合表明（ i）单层吸附模型很好地描述了数据，并且（ii）CNT的吸附能力与其表面积直接相关，还测量了13种PAH（其中11种迄今尚未报道）的吸附系数，且与环境相关。在低浓度范围内似乎没有竞争发生，并且吸附亲和力与化合物过冷液体的溶解度直接相关。

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  • 来源
    《Environmental Science & Technology》 |2011年第14期|p.6011-6017|共7页
  • 作者

    Melanie Kah; Xiaoran Zhang; Michiel T.O. Jonker; Thilo Hofinann;

  • 作者单位

    Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;

    Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;

    Institute for Risk Assessment Sciences, Utrecht University, P.O. Box 80177, 3508 TD Utrecht, The Netherlands;

    Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;

  • 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
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