Vinyl-functionalized covalent organic frameworks for effective radioactive iodine capture in aqueous solution
[Display omitted] •Spherical vinyl-functional COF-V exhibits a rapid adsorption rate (0.318 g g−1 min−1) and exceptionally high adsorption capacity of up to 437.8 mg g−1 for NaI in aqueous solution.•More than 90% Na131I is removed from aqueous solutions ranging from 181.3 MBq to 1017.5 MBq.•Spherica...
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Veröffentlicht in: | Separation and purification technology 2023-04, Vol.310, p.123160, Article 123160 |
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•Spherical vinyl-functional COF-V exhibits a rapid adsorption rate (0.318 g g−1 min−1) and exceptionally high adsorption capacity of up to 437.8 mg g−1 for NaI in aqueous solution.•More than 90% Na131I is removed from aqueous solutions ranging from 181.3 MBq to 1017.5 MBq.•Spherical vinyl-functional COF-V with 1D channels facilitates the osmotic diffusion and adsorption of iodide ions in aqueous solutions in mesoporous pores, which plays a crucial role in the uptake of iodide ions.•The benzene C-H···I−1 hydrogen bonding between iodide ions and the two benzene rings connected by imine bonds and vinyl groups also promotes the efficient capture of NaI by spherical COF-V.
131I radioisotopes have been widely employed in diagnostic and therapeutic medicine processes, particularly for thyroid cancer. The radiation hazard of 131I offers a potential threat to environmental safety or human health, so the wastewater generated from the production of 131I drugs must be effluent disposed of on time. In this study, we developed novel vinyl-functionalized covalent organic frameworks (COFs) with large pore volume and internal surface area for highly effective radioactive iodine ions adsorption in water. The as-produced spherical COFs (COF-V) exhibited a rapid adsorption rate (0.318 g g−1 min−1) and exceptionally high adsorption capacity of up to 437.8 mg g−1 for iodine ions in water. Furthermore, it demonstrated more than 90% removal of Na131I in water with radiation doses ranging from 181.3 MBq (4.9 mCi) to 1017.5 MBq (27.5 mCi). Additional characterizations and density functional theory (DFT) calculations revealed that the vinyl groups were linked with a benzene ring and imine to form a large and complete π-π conjugate system with 1D open channels. These channels provided sufficient sites for the effective adsorption of I ions on vinyl groups and benzene rings through hydrogen bonding. The excellent adsorption performance and radiation stability make the developed spherical COF-V a promising candidate for efficient radioactive iodine removal in wastewater. |
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ISSN: | 1383-5866 1873-3794 |
DOI: | 10.1016/j.seppur.2023.123160 |