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Hydrazone-Linked Covalent Organic Framework Catalyst via Efficient Pd Recovery from Wastewater.

Mahira Bashri¹, Sushil Kumar¹, Pallab Bhandari²

¹Department of Chemistry, Khalifa University of Science & Technology, Post Office Box 127788, Abu Dhabi, United Arab Emirates.

ACS Applied Materials & Interfaces

|August 21, 2024

Summary

This study introduces a covalent organic framework (COF) for efficient palladium (Pd) recovery from wastewater. The recovered Pd was successfully reused as a catalyst, promoting a circular economy.

Keywords:

catalysis covalent organic frameworks palladium adsorption sustainability water purification

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Area of Science:

Materials Science
Environmental Chemistry
Catalysis

Background:

Palladium (Pd) discharge raises environmental concerns, necessitating sustainable recovery methods.
Adsorption is an effective technique for selectively removing Pd from industrial wastewater.

Purpose of the Study:

To investigate a hydrazone-linked covalent organic framework (Tfpa-Od COF) for high-affinity adsorption of Pd2+ ions.
To evaluate the Pd-adsorbed COF as a recyclable heterogeneous catalyst for Suzuki-Miyaura coupling reactions.

Main Methods:

Synthesis and characterization of the Tfpa-Od COF.
Adsorption experiments to determine Pd2+ uptake efficiency and capacity.
Catalytic evaluation of Pd-loaded COF in Suzuki-Miyaura coupling.

Main Results:

The Tfpa-Od COF exhibited a high Pd2+ adsorption capacity (372.59 mg g-1) and selectivity.
Achieved a distribution coefficient (Kd) of 3.62 × 106 mL g-1 for Pd2+.
The Pd-adsorbed COF demonstrated good catalytic activity and recyclability in Suzuki-Miyaura coupling.

Conclusions:

The Tfpa-Od COF is a promising material for efficient palladium recovery from wastewater.
This approach facilitates the reuse of waste palladium as heterogeneous catalysts, supporting the circular economy.