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Site-Enriched Quinoline Covalent Organic Frameworks for Selective Palladium Recovery under Acidic Radioactive Media
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DOI：10.1021/jacsau.6c00435.png)
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Abstract
En 中文
Palladium, as a member of the precious platinum group metals and a strategic resource, exhibits uneven global distribution and price volatility. This has sparked significant interest in its efficient recovery technologies. To tackle the challenge of highly selective Pd2+ recovery and Pt/Pd separation under extreme conditions, we developed a covalent organic framework (COF) adsorbent enriched with pyridinic nitrogen and carboxyl groups, synthesized via one-pot Povarov and Doebner multicomponent reactions. Intriguingly, the incorporation of multiple binding sites within the COF framework significantly enhances Pd2+ interactions, enabling rapid recognition and efficient Pd2+ extraction under highly acidic and simulated high-level radioactive conditions. The as-synthesized site-enriched COF (PQCOF-2) exhibits the highest Pd2+ adsorption capacity of 376 mg g–1 in 3 M HNO3 and achieves a Pt/Pd separation factor of 4.10. Further, PQCOF-2 showed an exceptional Pd2+ distribution coefficient (Kd = 6.79 × 105 mL g–1) and removal efficiency exceeding 99% in simulated high-level radioactive waste solutions, together with notable recovery ability. In brief, this work provides a versatile example for developing advanced adsorbents aimed at capturing radioactive metal ions.
Keywords:
Adsorption
Covalent organic frameworks
Nitrogen
Palladium
Wastes
povarov reactions
doebner reactions
covalent organic frameworks
Pd2+ selective adsorption
Pt/Pd separation
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