Ion exchange of lanthanides with conventional and ion-imprinted resins containing sulfonic or iminodiacetic acid groups

ABSTRACT

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^Er_Sm increased from 1.0 of the conventional resin to 3.5 of the imprinted resin.

KEYWORDS:

• Lanthanides
• ion exchange
• ion-imprinting
• selectivity

Declaration of interest statement

The authors declare no conflict of interests.

Additional information

Funding

This work was supported by the Academy of Finland [297120].