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research article

A post-synthetic modification strategy for enhancing Pt adsorption efficiency in MOF/polymer composites

Schertenleib, Till Marian  
•
Karve, Vikram Vinayak  
•
Stoian, Dragos
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May 10, 2024
Chemical Science

Growing polymers inside porous metal-organic frameworks (MOFs) can allow incoming guests to access the backbone of otherwise non-porous polymers, boosting the number and/or strength of available adsorption sites inside the porous support. In the present work, we have devised a novel post-synthetic modification (PSM) strategy that allows one to graft metal-chelating functionality onto a polymer backbone while inside MOF pores, enhancing the material's ability to recover Pt(iv) from complex liquids. For this, polydopamine (PDA) was first grown inside of a MOF, known as Fe-BTC (or MIL-100 Fe). Next, a small thiol-containing molecule, 2,3-dimercapto-1-propanol (DIP), was grafted to the PDA via a Michael addition. After the modification of the PDA, the Pt adsorption capacity and selectivity were greatly enhanced, particularly in the low concentration regime, due to the high affinity of the thiols towards Pt. Moreover, the modified composite was found to be highly selective for precious metals (Pt, Pd, and Au) over common base metals found in electronic waste (i.e., Pb, Cu, Ni, and Zn). X-ray photoelectron spectroscopy (XPS) and in situ X-ray absorption spectroscopy (XAS) provided insight into the Pt adsorption/reduction process. Last, the PSM was extended to various thiols to demonstrate the versatility of the chemistry. It is hoped that this work will open pathways for the future design of novel adsorbents that are fine-tuned for the rapid, selective retrieval of high-value and/or critical metals from complex liquids.

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Type
research article
DOI
10.1039/d4sc00174e
Web of Science ID

WOS:001217172600001

Author(s)
Schertenleib, Till Marian  
Karve, Vikram Vinayak  
Stoian, Dragos
Asgari, Mehrdad  
Trukhina, Olga  
Oveisi, Emad  
Mensi, Mounir  
Queen, Wendy L.  
Date Issued

2024-05-10

Publisher

Royal Soc Chemistry

Published in
Chemical Science
Subjects

Physical Sciences

•

Anticancer Drugs Degradation

•

Metal-Organic Frameworks

•

X-Ray-Absorption

•

Transition-Metals

•

Electronic Waste

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Platinum

•

Recovery

•

Exafs

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Mil-100(Fe)

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Chemistry

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ISIC  
FunderGrant Number

Schweizerischer Nationalfonds zur Frderung der Wissenschaftlichen Forschung

206021_189629

Swiss National Science Foundation

296087

Research Council of Norway

P2ELP2_195134

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Available on Infoscience
June 5, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/208292
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