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 Y 3+ from aqueous solution

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Abstract

CO 3 2--intercalated Cu-Al layered double hydroxide (CO 3·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 CO 3·Cu-Al LDH occurred in four stages. The production of Cu-Al oxide was caused by the thermal decomposition of CO 3·Cu-Al LDH until the third stage. The first stage was the elimination of adsorbed surface water and interlayer water in CO 3·Cu-Al LDH. The second and third stages were the dehydroxylation of the brucite-like octahedral layers and the elimination of CO 3 2- intercalated in the interlayers. The edta·Cu-Al LDH was found to take up Y 3+ in aqueous solution. The uptake of Y 3+ 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 Sc 3+ > Y 3+ > La 3+ for all time durations, which was attributable to differences among the stabilities of Sc(edta) -, Y(edta) - and La(edta) -.

Original languageEnglish
Pages (from-to)4216-4219
Number of pages4
JournalMaterials Research Bulletin
Volume47
Issue number12
DOIs
Publication statusPublished - 2012 Dec

Keywords

  • A. Composites
  • A. Layered compounds

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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