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首页> 外文期刊>Environmental Science & Technology >Sorption and Transport of Salicylate in a Porous Heterogeneous Medium of Silica Quartz and Goethite
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Sorption and Transport of Salicylate in a Porous Heterogeneous Medium of Silica Quartz and Goethite

机译：水杨酸盐在石英和针铁矿质多孔非均质介质中的吸附和迁移

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摘要

Among transport studies of solutes in porous media, few works have combined microscopic speciauon with macroscopic-scale investigations to describe the impact of antecedent sorbed silica on the transport of organic ligands in porous heterogeneous media. In this study, the sorption of salicylate (SA) to goethite-coated sand (GCS) was investigated under static and dynamic conditions by combining batch experiments and column tests with infrared spectroscopy. On the basis of infrared spectra, the salicylate adsorption was described by one type of iron site and a mononuclear bidentate surface complex. The intrinsic complexation constant deduced from batch modeling was successfully applied to estimate the sorbed amount under flow through conditions at various water velocities (0.038-0.768 cm/min). The shape of the breakthrough curve of SA was characterized by two fronts in both SA concentration and pH. This behavior could be likely explained by the mobilization of initially adsorbed silica from goethite surface upon SA sorption. The SA breakthrough can be interpreted as retention of SA on available surface sites up to their saturation and then on additional reactive sites, becoming free due to silicate desorption. This present work demonstrated the importance of sorbed silicate on Fe-oxides in the prediction of reactive transport of organic species on natural surfaces.
机译：在多孔介质中溶质的迁移研究中，很少有文献将微观规范与宏观研究相结合来描述先质吸附二氧化硅对多孔非均质介质中有机配体迁移的影响。在这项研究中，结合批处理实验和柱测试与红外光谱，研究了在静态和动态条件下水杨酸盐（SA）对针铁矿包覆砂（GCS）的吸附。根据红外光谱，水杨酸盐的吸附是通过一种铁位点和单核双齿表面络合物来描述的。从批处理模型推导出的固有络合常数已成功应用于估算在各种水流速（0.038-0.768 cm / min）下流过条件下的吸附量。 SA的穿透曲线的形状以SA浓度和pH的两个前沿来表征。这种现象很可能可以通过SA吸附后从针铁矿表面迁移最初吸附的二氧化硅来解释。 SA的突破可以解释为SA保留在可用表面位点上直至饱和，然后保留在其他反应位点上，由于硅酸盐解吸而变得游离。这项工作证明了吸附在铁氧化物上的硅酸盐在预测有机物在自然表面上的反应性传输中的重要性。

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  • 来源
    《Environmental Science & Technology》 |2010年第7期|p.2447-2453|共7页
  • 作者

    B. RUSCH; K. HANNA; B. HUMBERT;

  • 作者单位

    Laboratoire de Chimie Physique et Microbiologie pour l'Environnement, LCPME, UMR 7564 CNRS-Nancy Universite, 405 rue de Vandoeuvre, 54600 Villers-les-Nancy, France;

    Laboratoire de Chimie Physique et Microbiologie pour l'Environnement, LCPME, UMR 7564 CNRS-Nancy Universite, 405 rue de Vandoeuvre, 54600 Villers-les-Nancy, France;

    Institut des Materiaux Jean Rouxel, UMR 6502 CNRS-Universite de Nantes, 2 rue de la Houssiniere, BP 32229, 44322 Nantes, France;

  • 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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