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首页> 外文期刊>Environmental Science & Technology >Mercury(ll) Exchange by Highly Charged Swelling Micas, Sodium Engelhard Titanosilicate-4, and Sodium Titanosilicate
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Mercury(ll) Exchange by Highly Charged Swelling Micas, Sodium Engelhard Titanosilicate-4, and Sodium Titanosilicate

机译：通过高度带电的膨胀云母，Engelhard钛硅酸钠-4和钛硅酸钠进行汞（ll）交换

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摘要

Selective Hg -exchange properties of highly charged sodium swelling micas (Na-2-, Na-3-, and Na-4-micas), sodium Engelhard titanosilicate-4 (Na-ETS-4), and sodium titanosilicate were determined by use of distribution coefficients (Kd), ion-exchange isotherms, and Kielland plots for their potential use of Hg decontamination from groundwater and soils. X-ray diffraction (XRD) patterns after 2Na* — Hg2* exchange were collected to check for change in (001) spacings of differently charged sodium micas. The isotherms and Kieiland plots suggested that Na-ETS-4 was highly selective for Hg2*. Also, the Kd value of Na-ETS-4 was the highest among the tested exchangers, supporting its high selectivity. Hg releases from Hg-exchanged Na-4-mica and Na-ETS-4 were found to be lower compared to other samples tested with simulated groundwater. The (001) spacings of sodium micas after Hg2* exchange changed from --12 to ~14 A or/and 12 A depending on their layer charge density and the uptake amount of Hg. Our results suggest that Na-ETS-4 is a good candidate for mercury(II) decontamination from groundwater and soils.
机译：通过使用测定了高度带电荷的钠溶胀云母（Na-2-，Na-3-和Na-4-micas），Engelhard钛硅酸钠-4（Na-ETS-4）和钛硅酸钠的选择性Hg交换特性。分布系数（Kd），离子交换等温线和Kielland图，说明它们潜在地利用了地下水和土壤中的Hg净化作用。收集2Na *-Hg2 *交换后的X射线衍射（XRD）图，以检查带不同电荷的钠云母（001）间距的变化。等温线和Kieiland图表明Na-ETS-4对Hg2 *具有高度选择性。同样，Na-ETS-4的Kd值在测试的交换剂中最高，支持其高选择性。与模拟地下水测试的其他样品相比，汞交换的Na-4-云母和Na-ETS-4的汞释放量更低。交换Hg2 *后的钠云母的（001）间距从-12变为〜14 A或/和12 A，这取决于它们的层电荷密度和Hg的吸收量。我们的结果表明，Na-ETS-4是从地下水和土壤中去除汞（II）的良好候选者。

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  • 来源
    《Environmental Science & Technology》 |2011年第16期|p.6954-6960|共7页
  • 作者

    Young Dong Noh; Sridhar Komarneni;

  • 作者单位

    Department of Crop and Soil Sciences and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States;

    Department of Crop and Soil Sciences and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States;

  • 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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