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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

792
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
792

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Related Experiment Video

Updated: Nov 19, 2025

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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High-efficient liquid exfoliation of 2D metal-organic framework using deep-eutectic solvents.

Xinxin Sang1, Dongyin Liu1, Junling Song1

  • 1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.

Ultrasonics Sonochemistry
|January 26, 2021
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Summary

This study introduces an eco-friendly method using deep eutectic solvent (DES) to exfoliate metal-organic framework (MOF) nanosheets. These novel MOF nanosheets demonstrate enhanced sensitivity for detecting various metal ions, offering a sustainable approach for sensor development.

Keywords:
Deep eutectic solventEu-doped MOFExfoliationMAMS-1Metal-organic frameworkSensing

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Green Chemistry

Background:

  • Two-dimensional (2D) metal-organic framework (MOF) nanosheets are gaining attention for their unique properties.
  • Conventional methods for MOF exfoliation often rely on harsh organic solvents, posing environmental concerns.
  • Developing sustainable and efficient routes for MOF nanosheet production is crucial.

Purpose of the Study:

  • To develop an environmentally friendly method for exfoliating layered MOF (MAMS-1) into few-layered nanosheets.
  • To investigate the use of deep eutectic solvent (DES) as a sustainable alternative to conventional organic solvents.
  • To evaluate the potential of MAMS-1 nanosheets for sensing applications.

Main Methods:

  • Exfoliation of layered MOF (MAMS-1) using deep eutectic solvent (DES) under sonication.
  • Utilized poly(vinylpyrrolidone) (PVP) as a surfactant to assist in the delamination process.
  • Encapsulated Eu3+ cations within the MAMS-1 nanosheets (MAMS-1-NS) for luminescence studies.

Main Results:

  • Achieved a high exfoliation rate of up to 70% for MAMS-1 into two-host-layer nanosheets using DES and PVP.
  • The resulting MAMS-1 nanosheets exhibited stable suspensions for over a month due to their atomically thin structure and tert-butyl exteriors.
  • Eu3+@MAMS-1-NS demonstrated highly sensitive and selective detection of Fe3+, Hg2+, Cr2O72-, and MnO4- through fluorescence quenching.

Conclusions:

  • The DES-assisted exfoliation offers a sustainable and efficient route for producing MOF nanosheets.
  • The ultrathin morphology and accessible active sites of MAMS-1-NS significantly enhance luminescence sensing capabilities compared to bulk materials.
  • Eu3+@MAMS-1-NS shows promise as a multi-responsive luminescent sensor for various analytes.