抄録
The transport of three tervalent lanthanides (Ln), La(III), Gd(III) and Lu(III) with the tubular supported liquid membrane impregnated with 2-thenoyltrifluoroacetone (TTA) in the presence of the unidentate ligand, tributylphosphate (tbp), or the bidentate ligand, 2,2’-bipyridine (bpy) in kerosene was investigated. All the plots of logarithmic transport rate constant (kobs) against pH for Ln gave straight lines with slopes of 0.6-0.9 for TTA alone, 2.9-3.1 for the TTA-tbp system and 2.2-2.7 for the TTA-bpy system at lower pH. At higher pH, values of log kobs for all Ln were kept to about -2.8. Increments of transport rates of Ln are attributed to synergistic effects by the addition of tbp or bpy. The TTA-bpy system is more effective for the separation than the other systems.
