Thermal decomposition behavior of Cu-Al layered double hydroxide, and ethylenediaminetetraacetate-intercalated Cu-Al layered double hydroxide reconstructed from Cu-Al oxide for uptake of Y³⁺ from aqueous solution

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• 作者：Tomohito Kameda ; ^{kameda@env.che.tohoku.ac.jp} ; Kazuaki Hoshi ; Toshiaki Yoshioka
• 关键词：A. Composites ; A. Layered compounds
• 刊名：Materials Research Bulletin
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：47
• 期：12
• 页码：4216-4219
• 全文大小：461 K

文摘

CO₃^2?-intercalated Cu-Al layered double hydroxide (CO₃¡¤Cu-Al LDH) was calcined to yield Cu-Al oxide, and then ethylenediaminetetraacetate-intercalated Cu-Al LDH (edta¡¤Cu-Al LDH) was prepared by reconstructing Cu-Al oxide in edta solution. Decomposition of CO₃¡¤Cu-Al LDH occurred in four stages. The production of Cu-Al oxide was caused by the thermal decomposition of CO₃¡¤Cu-Al LDH until the third stage. The first stage was the elimination of adsorbed surface water and interlayer water in CO₃¡¤Cu-Al LDH. The second and third stages were the dehydroxylation of the brucite-like octahedral layers and the elimination of CO₃^2? intercalated in the interlayers. The edta¡¤Cu-Al LDH was found to take up Y³⁺ in aqueous solution. The uptake of Y³⁺ was caused not only by the chelating function of Hedta^3? in the interlayer but also by the chemical behavior of Cu-Al LDH itself. The edta¡¤Cu-Al LDH was found to selectively take up rare earth ions from a mixed solution. The degree of uptake was high, in the order Sc³⁺ > Y³⁺ > La³⁺ for all time durations, which was attributable to differences among the stabilities of Sc(edta)^?, Y(edta)^? and La(edta)^?.