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Sites of Lu(III) Sorbed to and Coprecipitated with Hectorite

机译：Lu（III）吸附在锂蒙脱石上并与之共沉淀的部位

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摘要

The Lu(III) binding mechanisms by trioctahedral smectite hectorite in aqueous systems were investigated by extended X-ray absorption fine structure (EXAFS) spectroscopy. Coprecipitated hectorite (Lu755Hec), its precursor phase (Lu/ Brucite), and the surface sorbed hectorite (Lu/SHCa1) were prepared as oriented samples to collect polarized EXAFS (P-EXAFS) data. EXAFS analysis indicated that Lu(III) is 6-fold coordinated by oxygen in Lu/Brucite and in Lu755Hec, and surrounded by Mg/Si shells. The angular dependence of the 0 and Mg coordination numbers for Lu/Brucite hinted an Lu(III) incorporation in brucite layers. Mg and Si cationic shells were detected at distances suggesting a clay-like octahedral environment in Lu755Hec. EXAFS data for Lu/SHCal were consistent with Lu(III) forming inner-sphere surface complexes at hectorite platelets edges, but slightly above/below the octahedral plane. Finally, Lu (III) polyhedra share edge(s) and corner(s) with Si tetrahedra upon sorption to silica (Lu/Silica). Lu(III) binding to silicate oligomers or to silicate groups of the clay basal planes and formation of Lu(III) surface complexes during the coprecipitation experiment are marginal.
机译：通过扩展X射线吸收精细结构（EXAFS）光谱研究了三八面体蒙脱石锂蒙脱石在水系统中的Lu（III）结合机理。准备共沉淀锂蒙脱石（Lu755Hec），其前体相（Lu / Brucite）和表面吸附的锂蒙脱石（Lu / SHCa1）作为定向样品，以收集极化EXAFS（P-EXAFS）数据。 EXAFS分析表明，Lu（III）在Lu / Brucite和Lu755Hec中被氧配位6倍，并被Mg / Si壳包围。 Lu / Brucite的0和Mg配位数的角度依赖性暗示在水镁石层中掺入Lu（III）。在远处检测到Mg和Si阳离子壳，表明Lu755Hec中有粘土状的八面体环境。 Lu / SHCal的EXAFS数据与在锂蒙脱石血小板边缘形成内球表面复合物的Lu（III）一致，但在八面体平面的上方/下方稍稍。最后，Lu（III）多面体在吸附到二氧化硅（Lu / Silica）上时与Si四面体共享边和角。在共沉淀实验中，Lu（III）与硅酸盐低聚物或粘土基面的硅酸盐基团的结合以及Lu（III）表面配合物的形成是微不足道的。

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  • 来源
    《Environmental Science & Technology》 |2009年第23期|8807-8812|共6页
  • 作者

    NICOLAS FINCK; MICHEL L. SCHLEGEL; DIRK BOSBACH;

  • 作者单位

    Institut fuer Nukleare Entsorgung (INE), Forschungszentrum Karlsruhe, P.O. Box 3640, D-76021 Karlsruhe, Germany;

    CEA Saclay - DEN/DPC/SCP/LRSI, P.O. Box 11, F-91191 Gif-sur-Yvette, France;

    Institut fuer Energieforschung 6, Forschungszentrum Juelich, D-S2425 Juelich, Germany Helmholtz Virtual Institute 'Advanced Solid-Aqueous RadioGeochemistry', 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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