Synthesis of Li-Al layered double hydroxide intercalated with amino tris(methylene phosphonic acid) and kinetic and equilibrium studies of the uptake of Nd 3+ and Sr 2+ ions

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

A Li-Al layered double hydroxide intercalated with amino tris(methylene phosphonic acid) (AMP·Li-Al LDH) was synthesized by the drop-wise addition of an Al-containing solution to a Li-AMP solution at a constant pH of 8.0. The AMP·Li-Al LDH was found to take up Nd 3+ and Sr 2+ ions from aqueous solutions; this phenomenon was attributable to the metal-chelating functionality of the AMP ions in the interlayers of the AMP·Li-Al LDH. Further, the AMP·Li-Al LDH was found to take up Nd 3+ ions preferentially than Sr 2+ ions. This was attributable to the stability of the Nd-AMP complex being higher than that of the Sr-AMP complex. The mass-transfer-controlled shrinking-core model could describe the uptake behavior better than the surface-reaction-control model. The AMP ions in the AMP·Li-Al LDH interlayers rapidly formed chelate complexes with the Nd 3+ or Sr 2+ ions. As a result, the transfer of Nd 3+ and Sr 2+ ions through the product layer was the rate-limiting step. Furthermore, this reaction could be explained by a Langmuir-type adsorption mechanism, indicating that it involved chemical adsorption; this was consistent with the formation of chelate complexes between Nd 3+ and Sr 2+ ions and the AMP ions in the interlayers of the AMP·Li-Al LDH.

Original languageEnglish
Pages (from-to)523-528
Number of pages6
JournalApplied Surface Science
Volume366
DOIs
Publication statusPublished - 2016 Mar 15

Keywords

  • Amino tris(methylene phosphonic acid)
  • Equilibrium
  • Kinetic
  • Li-Al layered double hydroxide
  • Uptake

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'Synthesis of Li-Al layered double hydroxide intercalated with amino tris(methylene phosphonic acid) and kinetic and equilibrium studies of the uptake of Nd <sup>3+</sup> and Sr <sup>2+</sup> ions'. Together they form a unique fingerprint.

Cite this