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

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.