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Highly Charged Swelling Mica-Type Clays for Selective Cu Exchange

机译：高电荷膨胀的云母型粘土，用于选择性铜交换

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There is a need to develop highly Cu~(2+) selective materials which can potentially remediate copper contaminated soils and water. Here we show that several highly charged synthetic swelling mica-type clays are highly selective for copper exchange. The synthetic micas have cation exchange capacities (CECs), which are close to their theoretical values. Both Na-saturated and Mg-saturated micas were investigated for Cu ion exchange selectivity. Ion exchange isotherms and Kielland plots were constructed using the equilibrated solution analyses. From these studies it was found that Na-4-mica and Na-3-mica could selectively exchange copper at lower concentrations from solution, whereas Na-2-mica sample performed better by showing Cu ion exchange selectively to almost its capacity. The EPR spectra of Cu-exchanged micas coincide with the mica's charge characteristics that predict increased binding strength of exchangeable Cu in Na-4-mica and Na-3-mica than in Na-2-mica.
机译：需要开发高度铜〜（2+）选择性材料，以潜在地修复铜污染的土壤和水。在这里，我们显示了几种高度带电的合成膨胀云母型粘土对铜交换具有高度选择性。合成云母具有阳离子交换容量（CEC），接近其理论值。研究了Na饱和和Mg饱和的云母对Cu离子交换的选择性。离子交换等温线和Kielland图使用平衡溶液分析法构建。从这些研究中发现，Na-4-云母和Na-3-云母可以选择性地从溶液中交换较低浓度的铜，而Na-2-云母样品通过选择性地显示铜离子交换几乎达到其容量而表现更好。铜交换的云母的EPR谱图与云母的电荷特征相符，云母的电荷特征预测Na-4-云母和Na-3-云母中可交换Cu的结合强度比Na-2-云母高。

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