Macrocyclic Chelators for Aqueous Lanthanide Separations via Precipitation: Toward Sustainable Recycling of Rare-Earths from NdFeB Magnets

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F25%3A00637194" target="_blank" >RIV/61388963:_____/25:00637194 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/25:00637194 RIV/61388980:_____/25:00637194 RIV/00216208:11310/25:10499495 RIV/61989100:27240/25:10259384

Result on the web

<a href="https://doi.org/10.1021/jacs.5c04150" target="_blank" >https://doi.org/10.1021/jacs.5c04150</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/jacs.5c04150" target="_blank" >10.1021/jacs.5c04150</a>

Result language

angličtina

Original language name

Macrocyclic Chelators for Aqueous Lanthanide Separations via Precipitation: Toward Sustainable Recycling of Rare-Earths from NdFeB Magnets

Original language description

Rare-earth elements (REEs) are critical materials in modern industry, but their production has a significant environmental footprint. Environmentally friendly separation methods would enable efficient, sustainable recycling of REEs. This work introduces a class of cyclen-based macrocyclic chelators that induce significant differences in solubility for REE chelates, enabling their selective precipitation from pH-neutral aqueous solution. The process was refined using simple coordinating additives (e.g., acetate) to form ternary coordination compounds to fine-tune these chelate solubilities. Conditions were optimized for the REEs found in NdFeB magnets, allowing separations of even adjacent lanthanides by repeated precipitations. Separation factors comparable to those of industrial solvent extraction methods were achieved without organic solvents. Analysis of NdFeB magnets from current electric car motors revealed an unexpected presence of holmium as a supplement and/or replacement for terbium and dysprosium, suggesting shifting industrial trends with implications for future recycling efforts. In a case study, one such automotive magnet was processed to obtain a 99.7% pure neodymium product. Scalable, tunable, and entirely aqueous, this approach advances the sustainable use of REEs toward a circular economy.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of the American Chemical Society

ISSN

0002-7863

e-ISSN

1520-5126

Volume of the periodical

147

Issue of the periodical within the volume

26

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

22666-22676

UT code for WoS article

001517649000001

EID of the result in the Scopus database

2-s2.0-105008885012