Journal
SEPARATION SCIENCE AND TECHNOLOGY
Volume 56, Issue 1, Pages 203-216Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01496395.2019.1708938
Keywords
Lanthanides; ion exchange; ion-imprinting; selectivity
Funding
- Academy of Finland [297120]
- Academy of Finland (AKA) [297120, 297120] Funding Source: Academy of Finland (AKA)
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The ion exchange equilibria of samarium, dysprosium, and erbium were measured in conventional and ion-imprinted resins. The ion-imprinted resins showed increased selectivity coefficients for samarium and erbium compared to conventional resins, indicating the importance of coordinative interactions.
Ion exchange equilibria of samarium, dysprosium, and erbium were measured in conventional and ion-imprinted resins containing sulfonic acid groups or iminodiacetic acid (ida) groups in H,H-form and partially neutralized H,Na-form. The ion-imprinted resins were prepared by copolymerization of complexes prepared from Er3+. Conventional resins have low selectivity because electrostatic interactions are dominant even for the ida resin. In ion imprinting, the complex structure formed a priori in bulk solution was retained in the resin and coordinative interactions became more prominent. As a result, the selectivity coefficient K-Sm(Er) increased from 1.0 of the conventional resin to 3.5 of the imprinted resin.
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