Cerium Separation with NaBiO3 Nanoflower Material via Oxidation Adsorption Strategy
Intralanthanide separation is essential for many advanced technological applications but is challenging owing to lanthanides’ similar chemical properties. Herein, NaBiO3 nanoflower, with a unique nanostructure, is reported to exhibit both high adsorption capacity (~190 mg/g) and the best Ce selectivity (separation factors (SF) >3000) for intralanthanide separation. The oxidation property and interlayer structure as well as structure transformation after adsorption determined by neutron powder diffraction are found to be critical for its excellent intralanthanide separation ability. This material is also used for the separation of 5f-elements, affording superior americium/curium selectivity (SF ~600). Further, the utilities of NaBiO3 nanoflower in practical applications including the extraction of cerium from bastnaesite, recovery of cerium from simulated glass residue, and Am/Cm separation in the simulated high-level liquid waste are also achieved, providing an efficient method to address the challenges in inorganic separation.