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Peer-reviewedCC BY-NCRSC advances

Solvent-coordination-triggered framework breathing enables rapid polychlorinated biphenyls elution from magnetic Fe3O4/MIL-88B(Fe) composites

  • Zhekuan Zhu1
  • Huimin Tong1
  • Xin Qiao1,2
  • Xvsheng Qiao1
  • Cheng-Ao Li1
  • Renren Deng1,3
  1. 1State Key Laboratory of Silicon and Advanced Semiconductor Materials, Institute for Composites Science Innovation, School of Materials Science and Engineering, Zhejiang University Hangzhou 310058 China
  2. 2State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths Baotou 014030 China
  3. 3Zhejiang Key Laboratory of Advanced Information Materials, Zhejiang University Hangzhou 310058 China
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Abstract

Elution is often a time-consuming step in solid-phase extraction because strongly retained analytes must be efficiently released from the sorbent before instrumental analysis. Here, we develop a magnetic Fe3O4/MIL-88B(Fe) composite that combines rapid magnetic separation with coordination-assisted elution for the preconcentration of polychlorinated biphenyls (PCBs) from water. In our design, superparamagnetic Fe3O4 nanoclusters in Fe3O4/MIL-88B(Fe) enable rapid recovery of the composites from aqueous suspensions, while the flexible MIL-88B(Fe) framework provided a solvent-responsive environment for PCB retention and release. After adsorption and vacuum drying, the PCB-loaded composites were treated with solvents of different electron-donating ability. Strong donor solvents, such as pyridine, provided substantially greater PCB release than weakly coordinating solvents. The elution behaviour was therefore more closely associated with solvent donor strength than with analyte solubility, consistent with coordination-assisted reopening of the MIL-88B(Fe) framework. Under optimized conditions, enrichment of trace PCBs from high volume tap water can be accomplished, affording recoveries of 70.9–90.5% and enrichment factors of 354–452. This study demonstrates that solvent coordination can facilitate analyte release from flexible MOF sorbents, providing a practical strategy for rapid magnetic sample preparation of trace hydrophobic organic pollutants.

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Cite

BibTeXRIS
BibTeX
@article{zhu2026solventcoordinationtriggered,
  title = {{Solvent-coordination-triggered framework breathing enables rapid polychlorinated biphenyls elution from magnetic Fe3O4/MIL-88B(Fe) composites}},
  author = {Zhekuan Zhu and Huimin Tong and Xin Qiao and Xvsheng Qiao and Cheng-Ao Li and Renren Deng},
  journal = {RSC advances},
  year = {2026},
  month = oct,
  doi = {10.1039/d6ra06601a},
  url = {https://europepmc.org/article/PMC/PMC13673695},
  note = {CC BY-NC},
}
RIS
TY  - JOUR
TI  - Solvent-coordination-triggered framework breathing enables rapid polychlorinated biphenyls elution from magnetic Fe3O4/MIL-88B(Fe) composites
AU  - Zhekuan Zhu
AU  - Huimin Tong
AU  - Xin Qiao
AU  - Xvsheng Qiao
AU  - Cheng-Ao Li
AU  - Renren Deng
PY  - 2026
DA  - 2026/10/16
JO  - RSC advances
DO  - 10.1039/d6ra06601a
UR  - https://europepmc.org/article/PMC/PMC13673695
AB  - Elution is often a time-consuming step in solid-phase extraction because strongly retained analytes must be efficiently released from the sorbent before instrumental analysis. Here, we develop a magnetic Fe3O4/MIL-88B(Fe) composite that combines rapid magnetic separation with coordination-assisted elution for the preconcentration of polychlorinated biphenyls (PCBs) from water. In our design, superparamagnetic Fe3O4 nanoclusters in Fe3O4/MIL-88B(Fe) enable rapid recovery of the composites from aqueous suspensions, while the flexible MIL-88B(Fe) framework provided a solvent-responsive environment for PCB retention and release. After adsorption and vacuum drying, the PCB-loaded composites were treated with solvents of different electron-donating ability. Strong donor solvents, such as pyridine, provided substantially greater PCB release than weakly coordinating solvents. The elution behaviour was therefore more closely associated with solvent donor strength than with analyte solubility, consistent with coordination-assisted reopening of the MIL-88B(Fe) framework. Under optimized conditions, enrichment of trace PCBs from high volume tap water can be accomplished, affording recoveries of 70.9–90.5% and enrichment factors of 354–452. This study demonstrates that solvent coordination can facilitate analyte release from flexible MOF sorbents, providing a practical strategy for rapid magnetic sample preparation of trace hydrophobic organic pollutants.
SN  - 2046-2069
ER  -