Size-dependent selective crystallization using an inorganic mixed-oxoanion system for lanthanide separation

Area of Science:

• Inorganic Chemistry
• Materials Science
• Crystallization Science

Background:

• Lanthanide separation is crucial for advanced technologies.
• Existing separation methods are often complex and energy-intensive.
• Developing efficient and selective separation techniques remains a significant challenge.

Purpose of the Study:

• To develop a unique selective crystallization strategy for lanthanide separation.
• To utilize an iodate-sulfate mixed-anion system for this purpose.
• To achieve efficient separation of specific lanthanide pairs.

Main Methods:

• A novel selective crystallization strategy was developed.
• An iodate-sulfate mixed-anion system was employed.
• Periodic divergences in crystal formation energy were exploited.

Main Results:

• Simple separations of Nd/Dy, La/Lu, Gd/Tb, La/Dy, and Nd/Lu were achieved.
• Separation factors reached up to 123(5) for Nd/Dy, 100(2) for La/Lu, 2.4(2) for Gd/Tb, 137(9) for La/Dy, and 85(6) for Nd/Lu.
• The method demonstrated effectiveness in separating early lanthanides.

Conclusions:

• The developed iodate-sulfate mixed-anion crystallization strategy is effective for lanthanide separation.
• Periodic divergences in crystal formation energy are key to this selective separation.
• This approach offers a promising route for efficient rare earth element separation.