Abstract
A LiAl layered double hydroxide intercalated with ethylenediaminetetraacetate (EDTA·LiAl 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·LiAl 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·LiAl LDH. However, EDTA·LiAl LDH was found to be inferior to LiAl LDH intercalated with triethylenetetramine-hexaacetic acid (TTHA·LiAl 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·LiAl 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·LiAl LDH was higher than that in the case of TTHA·LiAl LDH. In other words, EDTA·LiAl LDH was found to be superior to TTHA·LiAl LDH in selectively taking up metal ions.
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