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A post-synthetic modification strategy for enhancing Pt adsorption efficiency in MOF/polymer composites
Till Schertenleib1, Vikram V Karve1, Dragos Stoian2
1Institute of Chemical Science and Engineering (ISIC), École Polytechnique Fédérale de Lausanne (EPFL) Rue de l'industrie 17 1951 Sion Switzerland wendy.queen@epfl.ch.
Chemical Science
|June 7, 2024
Summary
Researchers developed a new method to enhance metal-organic frameworks (MOFs) for precious metal recovery. By grafting thiol groups onto polymers within MOFs, they significantly improved platinum (Pt) capture from complex liquids, offering a promising solution for recycling critical metals.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Polymers grown within porous metal-organic frameworks (MOFs) can improve adsorption properties.
- Post-synthetic modification (PSM) offers a route to functionalize materials after initial synthesis.
Purpose of the Study:
- To develop a novel PSM strategy for grafting metal-chelating functionalities onto polymers inside MOFs.
- To enhance the recovery of platinum (Pt) and other precious metals from complex liquid mixtures.
Main Methods:
- Polydopamine (PDA) was grown within Fe-BTC (MIL-100 Fe) MOF pores.
- 2,3-dimercapto-1-propanol (DIP) was grafted onto PDA via Michael addition.
- X-ray photoelectron spectroscopy (XPS) and in situ X-ray absorption spectroscopy (XAS) were used for characterization.
Main Results:
- The modified MOF composite demonstrated significantly enhanced Pt adsorption capacity and selectivity, especially at low concentrations.
- The material showed high selectivity for precious metals (Pt, Pd, Au) over base metals (Pb, Cu, Ni, Zn).
- The PSM strategy was successfully extended to other thiols, showing its versatility.
Conclusions:
- The developed PSM strategy effectively enhances MOF-based adsorbents for selective precious metal recovery.
- This approach offers a tunable platform for designing advanced materials for critical metal recycling from electronic waste and other complex sources.
