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Effects of Native Organic Material and Water on Sorption Properties of Reference Diesel Soot

机译：天然有机物和水对基准柴油机烟灰吸附性能的影响

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摘要

Soot has been considered as a potentially important sorbent for organic contaminants in soils, sediments, and aerosols. This paper demonstrates that native (authigenic) extractable organic material (EOM) and surface-covering water on soot may have a substantial influence on sorption properties of the soot. Sorption isotherms were determined for apolar and weakly polar sorbates (n-octane, cyclooctane, n-propylbenzene, naphthalene) from an aqueous solution to a standard reference material of diesel soot (SRM 2975) in the original state and after extraction with methanol. For all sorbates tested, removal of EOM from soot by methanol caused the sorption isotherms to be more nonlinear (decrease of Freundlich exponents by 0.19-0.25) compared to the untreated soot. The changes in the isotherms depend on both sorbate structure and sorbate concentration and can be accounted for by two opposing roles that EOM could have on the sorption properties of soot: (ⅰ) enhancing the overall sorption by absorbing the sorbate into the EOM phase, and (ⅱ) attenuating the sorbate adsorption to the soot carbon surface through sorption competition or site blockage. The n-alkane-to-cycloalkane sorption coefficient ratios (K_n/K_c) indicated that the removal of EOM altered the sorption mode for alkanes from absorption to adsorption. A comparison of the sorption isotherms measured in aqueous suspensions with the soot-air sorption coefficients reported for SRM 2975 in the literature showed that sorption to "soot in water" is significantly weaker than sorption to "soot in air", indicating that complete surface coverage with water suppresses the sorption by soot.
机译：煤烟被认为是土壤，沉积物和气溶胶中有机污染物的潜在重要吸附剂。本文证明了烟灰上的天然（自生）可萃取有机物（EOM）和表面覆盖水可能会对烟灰的吸附性能产生重大影响。测定了从水溶液到原始状态并用甲醇萃取后的柴油烟灰标准参照物（SRM 2975）中的非极性和弱极性山梨酸酯（正辛烷，环辛烷，正丙基苯，萘）的吸附等温线。对于所有测试的吸附剂，与未处理的烟尘相比，甲醇从烟灰中去除EOM导致吸附等温线更加非线性（弗氏指数降低0.19-0.25）。等温线的变化取决于山梨酸盐的结构和山梨酸盐的浓度，并且可以通过EOM对烟灰的吸附特性可能具有的两个相反的作用来解释：（ⅰ）通过将吸附物吸收到EOM相中来增强总体吸附，以及（ⅱ）通过吸附竞争或位阻来减弱吸附剂对烟灰碳表面的吸附。正构烷烃与环烷烃的吸附系数之比（K_n / K_c）表明，去除EOM改变了烷烃从吸收到吸附的吸附方式。在水悬浮液中测得的吸附等温线与文献中针对SRM 2975报道的烟尘-空气吸附系数的比较表明，对“水中的烟尘”的吸附明显弱于对“空气中的烟尘”的吸附，表明表面被完全覆盖用水抑制烟灰的吸附。

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  • 来源
    《Environmental Science & Technology》 |2009年第9期|3187-3193|共7页
  • 作者

    SATOSHI ENDO; PETER GRATHWOHL; STEFAN B. HADERLEIN; TORSTEN C. SCHMIDT;

  • 作者单位

    Center for Applied Geoscience (TAG), Eberhard-Karls-University of Tuebingen, Sigwartstrasse 10, D-72076 Tuebingen, Germany;

    Center for Applied Geoscience (TAG), Eberhard-Karls-University of Tuebingen, Sigwartstrasse 10, D-72076 Tuebingen, Germany;

    Center for Applied Geoscience (TAG), Eberhard-Karls-University of Tuebingen, Sigwartstrasse 10, D-72076 Tuebingen, Germany;

    Center for Applied Geoscience (TAG), Eberhard-Karls-University of Tuebingen, Sigwartstrasse 10, D-72076 Tuebingen, Germany Instrumental Analytical Chemistry, University of Duisburg-Essen, Lotharstrasse 1, D-47048 Duisburg, 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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