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首页> 外文期刊>Environmental Science & Technology >Incorporation off Eu(III) into Hydrotalcite: A TRLFS and EXAFS Study
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Incorporation off Eu(III) into Hydrotalcite: A TRLFS and EXAFS Study

机译：从水滑石中掺入Eu（III）：TRLFS和EXAFS研究

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摘要

The behavior of radionuclides in the environment (geo-, hydro-, and biosphere) is determined by interface reactions like adsorption, ion exchange, and incorporation processes. Presently, operational gross parameters for the distribution between solution and minerals are available. For predictive modeling of the radionuclide mobility in such systems, however, individual reactions and processes need to be localized, characterized, and quantified. A prerequisite for localization and clarification of the concerned processes is the use of modern advanced analytical and speciation methods, especially spectroscopy. In this study, Eu(III) was chosen as an analogue for trivalent actinides to identify the different species that occur by the Ln(III)/hydrotalcite interaction. Therefore, Eu(III) doped Mg-Al-Cl-hydrotalcite was synthesized and investigated by TRLFS, EXAFS, and XRD measurements. Two different Eu/hydrotalcite species were obtained. The minor part of the lanthanide is found to be inner-sphere sorbed onto the mineral surface, while the dominating Eu/hydrotalcite species consists of Eu(III) that is incorporated into the hydrotalcite lattice. Both Eu/hydrotalcite species have been characterized by their fluorescence emission spectra and lifetimes. Structural parameters of the incorporated Eu(III) species determined by EXAFS indicate a coordination number of 6.6 ± 1.3 and distances of 2.41 ± 0.02 A for the first Eu-OH shell.
机译：放射性核素在环境（地质，水和生物圈）中的行为取决于界面反应，例如吸附，离子交换和结合过程。目前，可获得用于溶液和矿物之间分布的操作总参数。但是，对于此类系统中放射性核素迁移率的预测建模，需要对单个反应和过程进行定位，表征和量化。本地化和弄清相关过程的先决条件是使用现代先进的分析和物种形成方法，尤其是光谱学。在这项研究中，选择Eu（III）作为三价act系元素的类似物，以鉴定通过Ln（III）/水滑石相互作用而出现的不同物种。因此，合成了Eu（III）掺杂的Mg-Al-Cl-水滑石，并通过TRLFS，EXAFS和XRD测量对其进行了研究。获得了两种不同的Eu /水滑石物种。发现镧系元素的一小部分是吸附在矿物表面上的内球，而主要的Eu /水滑石物种由掺入水滑石晶格的Eu（III）组成。两种Eu /水滑石物种均已通过其荧光发射光谱和寿命进行了表征。通过EXAFS确定的掺入Eu（III）物种的结构参数表明，第一个Eu-OH壳的配位数为6.6±1.3，距离为2.41±0.02A。

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