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DESORPTION OF RARE EARTH IONS FROM ETHYLENEDIAMINETETRAACETATE-INTERCALATED Cu-AL LAYERED DOUBLE HYDROXIDE USING 
Pages : [61] - [69]
Received : February 04, 2013
Communicated by : Professor Jifan Hu
Abstract
It is found that rare earth ions combined with ethylenediaminetetraacetate (edta) ions in the interlayers of loaded 
(Cu-Al layered double hydroxides intercalated with edta ions) can be exchanged with 
in aqueous solution. The level of recovery decreases in the order of 
for all time durations. The difference between the recovery levels can be attributed to the difference between the stabilities of the corresponding chelate complexes. The chelate formation constant for 
is much larger than those for 
and 
indicating that is effective for the recovery of 
and 
Thermodynamically, it is difficult for the to exchange with the 
combined with edta ions in the interlayers of 
because the chelate formation constant for .gif){kind=small}
is close to that for 
Keywords
desorption, rare earth, EDTA, layered double hydroxide.