Kinetics and equilibrium studies on the uptake of rare earth ions from aqueous solution using a Cu-Al layered double hydroxide intercalated with ethylenediaminetetraacetate

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Abstract

A Cu-AI layered double hydroxide intercalated with edta ions (edta•Cu-Al LDH) was able to take up rare earth ions from an aqueous solution. To determine the reaction mechanism, we have conducted kinetics and equilibrium studies on the uptake of rare earth ions such as Y3+, Sc3+, and La3+ from aqueous solution using edta•Cu-Al LDH. The uptake is more adequately described by the mass-transfer-controlled shrinking core model than by the surface-reaction-controlled model. The apparent activation energies were 19.6, 28.8, and 36.0 U mol-1 for Sc 3+, Y3+, and La3+, respectively, confirming that the reaction involved in the uptake of M3+ by edta•Cu-Al LDH proceeds under mass transfer control. This reaction can also be expressed by Langmuir-type adsorption, suggesting the formation of a 1:1 chelate complex between rare earth ions and edta ions in the edta•Cu-Al LDH interlayer. The equilibrium adsorption constants were 4.4, 0.89, and 0.41 and the maximum adsorption amounts were 1.4, 0.3, and 0.5 mmol g-1 for Sc 3+, Y3+, and La3+, respectively.

Original languageEnglish
Pages (from-to)1271-1276
Number of pages6
JournalFresenius Environmental Bulletin
Volume23
Issue number5
Publication statusPublished - 2014

Keywords

  • Cu-Al layered double hydroxide
  • Equilibrium
  • Ethylenedlamine-tetraacetate
  • Kinetics
  • Rare earth ion
  • Uptake

ASJC Scopus subject areas

  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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