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首页> 外文期刊>Environmental Science & Technology >Study of the interaction of Ni2+ and Cs+ on MX-80 bentonite; Effect of compaction using the 'capillary method'
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Study of the interaction of Ni2+ and Cs+ on MX-80 bentonite; Effect of compaction using the 'capillary method'

机译：Ni2 +和Cs +在MX-80膨润土上的相互作用研究；使用“毛细管法”的压实效果

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The goal of the paper is to assess the applicability of sorption models to describe the retention of contaminants on clay materials, both in dispersed and compacted states. A batch method is used to characterize the sorption equilibria between Cs, Ni, and MX-80 bentonite for solid-to-liquid ratios varying from 0.5 to 4200 kg/m(3). For compacted bentonite (dry density of 1100 kg/m(3)), a new method is presented where the material compaction is performed in PEEK capillaries. Sorption edges and isotherms were measured in the presence of a synthetic groundwater. A model considering cation exchange reactions with interlayer cations and surface complexation reactions with edge sites was used for the dispersed state. Montmorillonite was shown to be the dominant interacting phase in MX-80 bentonite. The applicability of the model to compacted bentonite was tested. The results indicate that under conditions where the cation exchange mechanism is dominant, there is no difference between the dispersed and compacted states. For the degree of compaction studied, all exchange sites are available for sorption. For Ni, when surface complexation is the dominant sorption mechanism, a decrease of the Kd values by a factor of about 3 was observed (pH 7-8, trace concentrations). This could be explained quantitatively by a diminution of the conditional interaction constant between Ni and the edge surface site in the compacted state. One consequence of this decrease is that the contribution of the organic matter content of MX-80 bentonite to the total sorption becomes significant.
机译：本文的目的是评估吸附模型的适用性，以描述污染物在分散状态和压实状态下在粘土材料上的保留情况。批处理方法用于表征Cs，Ni和MX-80膨润土之间的固液比介于0.5至4200 kg / m之间的吸附平衡（3）。对于压实的膨润土（干密度为1100 kg / m（3）），提出了一种新方法，其中在PEEK毛细管中进行材料压实。在合成地下水存在下测量吸附边缘和等温线。考虑到具有层间阳离子的阳离子交换反应和具有边缘位点的表面络合反应的模型用于分散状态。蒙脱土是MX-80膨润土中的主要相互作用相。测试了该模型对压实膨润土的适用性。结果表明，在阳离子交换机制占主导地位的条件下，分散状态和压缩状态之间没有差异。对于所研究的压实度，所有交换位点均可用于吸附。对于Ni，当表面络合是主要的吸附机理时，观察到Kd值降低了约3倍（pH 7-8，痕量浓度）。这可以通过减小Ni和压实状态下的边缘表面部位之间的条件相互作用常数来定量地解释。这种减少的结果是，MX-80膨润土的有机物含量对总吸附的贡献变得显着。

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