What question did this study set out to answer?

The aim is to efficiently separate Co(II) from Nd(III) and Dy(III) using a D001 cation exchange resin.

February 28, 2026Open Access

Highly Acidic Macro-Porous Cation Exchange Resin D001 for Efficient Separation of Co(II) from Nd(III) and Dy(III) During Rare Earth Recycling

Key Points

The aim is to efficiently separate Co(II) from Nd(III) and Dy(III) using a D001 cation exchange resin.
Introduced D001 cation exchange resin for selective separation.
Conducted adsorption experiments at pH 5 for optimal results.
Characterized resin performance with pseudo-second-order kinetics and Langmuir model.
Desorbed Co(II) using 2.5 M H2SO4 to achieve high purity.
The resin adsorbed Nd and Dy with capacities of 97.57 mg/g and 86.38 mg/g, respectively.
Co(II) showed low adsorption efficiency of 26.6%.
High purity Co(II) was desorbed with over 99% purity.
The resin maintained high performance over five cycles and across pH 2–7.

Abstract

Addressing the need for efficient separation of critical elements from NdFeB magnets, this study introduces, for the first time, a D001 cation exchange resin for the selective separation Co(II) from Nd(III) and Dy(III). At pH 5, the resin adsorbs Nd and Dy with high capacities (97.57 and 86.38 mg/g, respectively) and efficiencies (over 98%), but shows low affinity for Co (26.6% efficiency). The resin exhibits excellent stability across a wide pH range of 2–7 and maintains high adsorption performance over five consecutive cycles. The process follows pseudo-second-order kinetics and the Langmuir model. Co(II) is effectively desorbed with high purity (>99%) using 2.5 M H2SO4. Characterization confirms that adsorption occurs via ion exchange on –SO3Na groups. This method successfully separates Co, providing a high-purity stream for further rare earth purification and demonstrating strong industrial potential.

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