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首页> 外文期刊>Journal of Hazardous Materials >Organo/LDH nanocomposite as an adsorbent of polycyclic aromatic hydrocarbons in water and soil-water systems
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Organo/LDH nanocomposite as an adsorbent of polycyclic aromatic hydrocarbons in water and soil-water systems

机译：有机/ LDH纳米复合材料在水和土壤-水系统中作为多环芳烃的吸附剂

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摘要

Polycyclic aromatic hydrocarbons (PAHs) are considered as priority pollutants because of their high risk to human health. In this paper, we addressed the issue of using hydrotalcite-based nanocomposites as adsorbents of six low molecular weight PAHs (acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene and pyrene) to reduce their negative effects on the environment. A nanocomposite (HT-DDS) was prepared by intercalating the organic anion dodecylsulfate (DDS) in a Mg-Al hydrotalcite (HT), and then characterized using several analytical techniques. A Mediterranean soil was selected for being a high-risk scenario of groundwater contamination by leaching of pollutants. The nanocomposite displayed enhanced affinity for the PAHs in water as compared to carbonate-hydrotalcite (HTCO_3) and its calcined product (HT500), and showed a high irreversibility of the adsorption process (hysteresis coefficient, H＜0.15). The results revealed an increase of the pollutants retention in the soil by the addition of the nanocomposite that depended on the nanocomposite application rate and also on the hydrophobicity of each PAH. Accordingly, the use of HT-DDS as an amendment or barrier in contaminated soil is proposed for reducing the mobility of PAHs and, consequently, the adverse effect derived from rapid transport losses of the pollutants to the adjoining environmental compartments.
机译：多环芳烃（PAHs）被认为是主要污染物，因为它们对人体健康具有高风险。在本文中，我们解决了使用水滑石基纳米复合材料作为六种低分子量PAH（ac，芴，菲，蒽，荧蒽和pyr）的吸附剂的问题，以减少它们对环境的负面影响。通过将有机阴离子十二烷基硫酸盐（DDS）插入Mg-Al水滑石（HT）中来制备纳米复合材料（HT-DDS），然后使用多种分析技术对其进行表征。选择地中海土壤是由于淋溶污染物而造成地下水污染的高风险方案。与碳酸盐-水滑石（HTCO_3）及其煅烧产物（HT500）相比，纳米复合材料对水中的PAHs具有更高的亲和力，并且吸附过程具有高度不可逆性（磁滞系数，H ＜0.15）。结果表明，取决于纳米复合物的施用量以及每种PAH的疏水性，通过添加纳米复合物可以增加土壤中污染物的保留量。因此，提出使用HT-DDS作为被污染土壤中的改良剂或屏障，以降低PAHs的迁移率，并因此降低了污染物向邻近的环境隔间快速运输损失所产生的不利影响。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.74-80|共7页
  • 作者

    F. Bruna; R. Celis; M. Real; J. Cornejo;

  • 作者单位

    Instituto de Recursos Naturales y Agrobiologia de Sevilla (IRNAS), CSIC, Avenida Reina Mercedes 10, Apartado 1052,41080 Sevilla, Spain;

    Instituto de Recursos Naturales y Agrobiologia de Sevilla (IRNAS), CSIC, Avenida Reina Mercedes 10, Apartado 1052,41080 Sevilla, Spain;

    Instituto de Recursos Naturales y Agrobiologia de Sevilla (IRNAS), CSIC, Avenida Reina Mercedes 10, Apartado 1052,41080 Sevilla, Spain;

    Instituto de Recursos Naturales y Agrobiologia de Sevilla (IRNAS), CSIC, Avenida Reina Mercedes 10, Apartado 1052,41080 Sevilla, Spain;

  • 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
  • 中图分类
  • 关键词

    adsorption; contaminated soils; hydrotalcite; nanocomposite; polycyclic aromatic hydrocarbons;

    机译：吸附受污染的土壤;水滑石;纳米复合材料多环芳烃;

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