The role of pH in the separation of Lu and Yb by ion-exchange explained by novel chemical structures of lanthanide complexes

Cáceres-Rivero C.; Ramos-Trujillo B.J.; Farfán Y.; Solis J.L.; Bedregal P. · Results in Chemistry (2022) · DOI: 10.1016/j.rechem.2022.100514

Resumen

The individual separation of lanthanides is very complex due to the similarities between these elements. Ion-exchange separations with carboxylic acids are widely studied, but the importance of pH is overlooked. This study used citric acid to evaluate Lu and Yb separation with Dowex 50W-X8. The separation was monitored by X-ray fluorescence. Five new structures of Lu and Yb citrates are proposed. Better separation occurs when the pH of the ligand is pH 4.5, where a mononuclear structure is formed. Conversely, polynuclear structures are formed at higher pH, and separation fails. X-ray diffraction reveals different phases at each pH value, and FTIR results support the proposed structures.

Instituciones: Universidad Nacional de Ingeniería