Selective Extraction of Light Lanthanides by N,N-di(2-ethylhexyl)-diglycolamic Acid:Comparative Study with N,N-dimethyl-diglycolamic Acid as Chelator in Aqueous Solution

摘要

The complexation and selectivity of N,Ndi(2-ethylhexyl)-diglycolamic acid(HDEHDGA,HA)/kerosene toward the light lanthanides,La(Ⅲ),Ce(Ⅲ),Pr(Ⅲ),and Nd(Ⅲ),are presented for the extraction from chloride media.In the low pH region(pH=1.8-2.8),the obtained data reveal that the extraction of Ln(Ⅲ)is governed by cation-exchange mechanism and is driven by the negative change in enthalpy.