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首页> 外文会议>2014 International Conference on Composite Materials amp; Renewable Energy Applications >Hydration performance of dioctahedral smectite saturated with Ba2+ and Cs+ cations: Quantitative XRD investigation
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Hydration performance of dioctahedral smectite saturated with Ba2+ and Cs+ cations: Quantitative XRD investigation

机译：Ba 2 + 和Cs + 阳离子饱和的八面体绿土的水化性能：定量XRD研究

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摘要

The present paper aims at characterizing the hydration behavior in the case of dioctahedral smectite with different location charge (i.e. montmorillonite SWy-2 and beidellite SbId-1) exchanged by heavy metals ca < “(tions characterized by different valence (Ba2+ and Cs+) generally coming from industrial waste and wastewater solution. The study was performed basing on the quantitative X-ray diffraction investigation. This method consists on the comparison between experimental patterns with a theoretical ones calculated from structural models and allows us to determine the relative proportions of different hydration states (dehydrated.0W, monohydrated.1W, or bihydrated.2W,) that can coexist within smectite structure. Furthermore, position and amount of both interlayer water molecules and heavy metals cations can be also, determined along the c* axis. Obtained qualitative and quantitative XRD analysis showed the possibility to distinguish diverse hydration behavior of each complex. The presence of the monovalent cation (i.e. Cs+) in the interlayer space of both smectite restricts the water molecule intercalation that structures are dominated by two principal hydration states: 1 W and 0W. Whereas in the case of the bivalent cation (i.e. Ba2+), the interlayer water amount retuned in the beidellite and montmorillonite structure is more important seen the presence of a major bihydrated layers types in their interlayer's spaces.
机译：本文旨在表征重金属钙交换的具有不同位置电荷的双八面体蒙脱石（即蒙脱土SWy-2和贝得石SbId-1）的水合行为（特征价不同（Ba 2 + 和Cs + ）通常来自工业废料和废水溶液，该研究是基于X射线定量衍射研究进行的，该方法是通过将实验模式与根据结构模型计算出的理论值，可以确定蒙脱石结构中可以共存的不同水合状态（脱水.0W，一水合1W或二水合2W）的相对比例，以及两个层间水分子的位置和含量还可以沿c *轴测定重金属阳离子，通过定性和定量XRD分析表明，可以区分各种水合行为f每个复合体。在两种蒙脱石的层间空间中均存在一价阳离子（即Cs + ），限制了水分子的嵌入，该结构由两个主要的水合状态主导：1 W和0W。而对于二价阳离子（即Ba 2 + ），在贝得石和蒙脱石结构中重新调整的层间水量更为重要，因为在其层间空间中存在主要的二水合层类型。

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