Synergistic Effect of Core/Shell‑Structured Composite Fibers:Efficient Recovery of Rare‑Earth Elements from Spent NdFeB Permanent Magnets  

作　　者：Youngkyun Jung Yun Lee Su‑Jin Yoon Jae‑Woo Choi 

机构地区：[1]Center for Water Cycle Research,Korea Institute of Science and Technology(KIST),Seoul 02792,Republic of Korea [2]Department of Chemical and Biological Engineering,Korea University,Seoul 02841,Republic of Korea [3]Department of Energy and Environment Technology,KIST School,Korea University of Science and Technology,Seoul 02792,Republic of Korea

出　　处：《Advanced Fiber Materials》2024年第6期1729-1745,共17页先进纤维材料（英文）

基　　金：supported by grants from the National R&D program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(MSIT)(nos.2020M3H4A3106366 and RS-2023-00209565);by an institutional program grant(2E33081)From the Korea Institute of Science and Technology.

摘　　要：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.

关 键 词：Core/shell structures Fibrous adsorbents Synergistic adsorption Metal resource recovery Pressure drop Rare-earth elements 

分 类 号：TB33[一般工业技术—材料科学与工程]