Site-Enriched Quinoline Covalent Organic Frameworks for Selective Palladium Recovery under Acidic Radioactive Media
Feng Chen1, Tiejun Chen1, Xuelong He1
1State Key Laboratory for Advanced Fibers Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
Researchers developed a novel covalent organic framework (COF) for efficient palladium (Pd2+) recovery. This advanced adsorbent demonstrates high selectivity and capacity, even in harsh acidic and radioactive environments.
Area of Science:
- Materials Science
- Environmental Chemistry
- Inorganic Chemistry
Background:
- Palladium is a valuable platinum group metal with uneven global distribution and price volatility.
- Efficient and selective recovery technologies for palladium are crucial due to its strategic importance.
- Extreme conditions, such as high acidity and radioactivity, pose significant challenges for metal recovery.
Purpose of the Study:
- To develop a highly selective adsorbent for palladium(II) (Pd2+) recovery.
- To achieve efficient platinum/palladium (Pt/Pd) separation.
- To enable Pd2+ extraction under extreme conditions like high acidity and simulated high-level radioactive waste.
Main Methods:
- Synthesis of a covalent organic framework (COF) enriched with pyridinic nitrogen and carboxyl groups via one-pot Povarov and Doebner multicomponent reactions.
- Characterization of the synthesized COF (PQCOF-2) for its adsorption properties.
- Testing Pd2+ adsorption capacity and Pt/Pd separation factor in acidic media (3 M HNO3).
- Evaluation of Pd2+ removal efficiency and distribution coefficient in simulated high-level radioactive waste solutions.
Main Results:
- The synthesized site-enriched COF (PQCOF-2) demonstrated a high Pd2+ adsorption capacity of 376 mg g-1 in 3 M HNO3.
- Achieved a Pt/Pd separation factor of 4.10, indicating effective separation.
- Exhibited an exceptional Pd2+ distribution coefficient (Kd = 6.79 × 105 mL g-1) and >99% removal efficiency in simulated high-level radioactive waste.
- Demonstrated notable recovery ability of palladium from challenging matrices.
Conclusions:
- The developed pyridinic nitrogen and carboxyl group-enriched COF (PQCOF-2) is a highly effective adsorbent for selective Pd2+ recovery.
- This COF performs exceptionally well under extreme acidic and simulated radioactive conditions.
- The study presents a versatile approach for designing advanced adsorbents for capturing radioactive metal ions.
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