{"title":"Synergistic Effect of Core/Shell-Structured Composite Fibers: Efficient Recovery of Rare-Earth Elements from Spent NdFeB Permanent Magnets","authors":"Youngkyun Jung, Yun Lee, Su-Jin Yoon, Jae-Woo Choi","doi":"10.1007/s42765-024-00442-4","DOIUrl":null,"url":null,"abstract":"<div><p>NdFeB magnets are third-generation permanent magnets that are employed as indispensable components in various industries. Notably, rare-earth elements (REEs) such as Dy and Nd must be efficiently recovered from end-of-life magnets to enable resource circulation and reinforce unstable supply chains. To that end, this paper reports synergistically performing core/shell-structured composite fibers (CSCFs) containing sodium polyacrylate and nanoporous zeolitic imidazolate framework-8 (NPZIF-8) nanocrystals as a readily recoverable adsorbent with an exceptional REE-adsorbing ability. The CSCF core forms an NPZIF-8 nanocrystal shell on the fiber surface as well as draws REEs using its dense sodium carboxylate groups into the NPZIF-8 nanocrystal lattice with high specific surface area. The CSCFs exhibit significantly higher maximum adsorption capacities (468.60 and 435.13 mg·g<sup>−1</sup>) and kinetic rate constants (2.02 and 1.92 min<sup>−1</sup>) for the Nd<sup>3+</sup> and Dy<sup>3+</sup> REEs than those of previously reported REE adsorbents. Additionally, the simple application of the CSCFs to an adsorption reactor considerably mitigates the adsorbent-shape-induced pressure drop, thereby directly influencing the energy efficiency of the recovery. Moreover, the high REE-recovery ability, tractability, and recyclability of the CSCFs offers a pragmatic pathway to achieving cost-effective REE recovery. Overall, this study provides new insights into designing synergistically performing core/shell architectures for feasible REE recovery.</p><h3>Graphical Abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":459,"journal":{"name":"Advanced Fiber Materials","volume":"6 6","pages":"1729 - 1745"},"PeriodicalIF":17.2000,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Fiber Materials","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s42765-024-00442-4","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
NdFeB magnets are third-generation permanent magnets that are employed as indispensable components in various industries. Notably, rare-earth elements (REEs) such as Dy and Nd must be efficiently recovered from end-of-life magnets to enable resource circulation and reinforce unstable supply chains. To that end, this paper reports synergistically performing core/shell-structured composite fibers (CSCFs) containing sodium polyacrylate and nanoporous zeolitic imidazolate framework-8 (NPZIF-8) nanocrystals as a readily recoverable adsorbent with an exceptional REE-adsorbing ability. The CSCF core forms an NPZIF-8 nanocrystal shell on the fiber surface as well as draws REEs using its dense sodium carboxylate groups into the NPZIF-8 nanocrystal lattice with high specific surface area. The CSCFs exhibit significantly higher maximum adsorption capacities (468.60 and 435.13 mg·g−1) and kinetic rate constants (2.02 and 1.92 min−1) for the Nd3+ and Dy3+ REEs than those of previously reported REE adsorbents. Additionally, the simple application of the CSCFs to an adsorption reactor considerably mitigates the adsorbent-shape-induced pressure drop, thereby directly influencing the energy efficiency of the recovery. Moreover, the high REE-recovery ability, tractability, and recyclability of the CSCFs offers a pragmatic pathway to achieving cost-effective REE recovery. Overall, this study provides new insights into designing synergistically performing core/shell architectures for feasible REE recovery.
期刊介绍:
Advanced Fiber Materials is a hybrid, peer-reviewed, international and interdisciplinary research journal which aims to publish the most important papers in fibers and fiber-related devices as well as their applications.Indexed by SCIE, EI, Scopus et al.
Publishing on fiber or fiber-related materials, technology, engineering and application.