Preparation of Cu-Al layered double hydroxide intercalated with ethylenediaminetetraacetate by coprecipitation and its uptake of rare earth ions from aqueous solution

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• 作者：Tomohito Kameda ; ^{kameda@env.che.tohoku.ac.jp} ; Kazuaki Hoshi ; Toshiaki Yoshioka
• 关键词：Cu&ndash ; Al layered double hydroxide ; Ethylenediaminetetraacetate ; Coprecipitation ; Uptake ; Rare earth
• 刊名：Solid State Sciences
• 出版年：2013
• 出版时间：March, 2013
• 年：2013
• 卷：17
• 期：Complete
• 页码：28-34
• 全文大小：639 K

文摘

A Cu-Al layered double hydroxide intercalated with ethylenediaminetetraacetate (edta?Cu-Al LDH) was prepared by the dropwise addition of a Cu-Al nitrate solution to an edta solution at constant pH values of 8.0, 9.0, and 10.0. The edta?Cu-Al LDH had Hedta^3? in the interlayer. Furthermore, the preparation at pH 8.0 resulted in the intercalation of Cu(edta)^2?. The edta?Cu-Al LDH was found to take up rare earth ions from aqueous solution. The uptake of Sc³⁺ and Y³⁺ by edta?Cu-Al LDH was attributed to both the chelating functions of the edta ion in the interlayer and the chemical properties of Cu-Al LDH itself. The uptake of La³⁺ by edta?Cu-Al LDH was primarily caused by the chelating function of edta ions in the interlayer. The edta ions in the edta?Cu-Al LDH interlayer formed chelate complexes in the order Sc³⁺?>?Y³⁺?>?La³⁺ due to their relative stabilities, Sc(edta)^??>?Y(edta)^??>?La(edta)^?. Thus, edta ions retain their chelating function even when intercalated in a Cu-Al LDH interlayer.