TY - JOUR
T1 - Kinetics and equilibrium studies on the uptake of rare earth ions from aqueous solution using a Cu-Al layered double hydroxide intercalated with ethylenediaminetetraacetate
AU - Kameda, Tomohito
AU - Hoshi, Kazuaki
AU - Yoshioka, Toshiaki
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
KW - Cu-Al layered double hydroxide
KW - Equilibrium
KW - Ethylenedlamine-tetraacetate
KW - Kinetics
KW - Rare earth ion
KW - Uptake
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M3 - Article
AN - SCOPUS:84900813383
VL - 23
SP - 1271
EP - 1276
JO - Fresenius Environmental Bulletin
JF - Fresenius Environmental Bulletin
SN - 1018-4619
IS - 5
ER -