Uptake of Nd3+ and Sr2+ by Li-Al layered double hydroxides intercalated with ethylenediaminetetraacetate

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Abstract

A Li-Al layered double hydroxide intercalated with ethylenediaminetetraacetate (EDTA·Li-Al LDH) was prepared by the drop-wise addition of an Al solution to a Li-EDTA solution at a constant pH of 8.0. EDTA·Li-Al LDH was found to take up Nd3+ and Sr2+ ions from aqueous solutions, which can be attributed to the metal-chelating functions of the EDTA ions in the interlayers of EDTA·Li-Al LDH. However, EDTA·Li-Al LDH was found to be inferior to Li-Al LDH intercalated with triethylenetetramine-hexaacetic acid (TTHA·Li-Al LDH) for both Nd3+ and Sr2+ uptake. This may be explained by the fact that the Nd-EDTA and Sr-EDTA complexes are less stable than the Nd-TTHA and Sr-TTHA complexes, respectively, leading to the lower uptake of Nd3+and Sr2+, respectively. Further, EDTA·Li-Al LDH was found to take up Nd3+ ions preferentially over Sr2+ ions from aqueous solutions, which may be caused by the fact that the Nd-EDTA complex is more stable than the Sr-EDTA complex. It should be noted that the Nd3+/Sr2+ uptake selectivity in the case of EDTA·Li-Al LDH was higher than that in the case of TTHA·Li-Al LDH. In other words, EDTA·Li-Al LDH was found to be superior to TTHA·Li-Al LDH in selectively taking up metal ions.

Original languageEnglish
Pages (from-to)8-11
Number of pages4
JournalMaterials Chemistry and Physics
Volume177
DOIs
Publication statusPublished - 2016 Jul 1

Keywords

  • Adsorption
  • Chemical synthesis
  • Chemical techniques
  • Composite materials
  • Nanostructures
  • Precipitation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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