The effective capture and storage of volatile molecular iodine from nuclear waste is of great significance. Covalent organic frameworks (COFs) are a class of extended crystalline porous polymers that possess unique architectures with high surface areas, long-range order, and permanent porosity. Substantial efforts have been devoted to the design and synthesis of COF materials for the capture of radioactive iodine. In this review, we first introduce research techniques for determining the mechanism of iodine capture by COF materials. Then, the influencing factors of iodine capture performance are classified, and the design principles and strategies for constructing COFs with potential for iodine capture are summarized on this basis. Finally, our personal insights on remaining challenges and future trends are outlined, in order to bring more inspiration to this hot topic of research.

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A new three-dimensional heterometallic metal−organic framework (MOF), namely, {(Me 2 NH 2 ) 2 [CuK 4 (BPDSDC) 2 ]} n (1), has been synthesized under solvothermal conditions. Compound 1 was constructed by biphenyl-3,3′-disulfonyl-4,4′-dicarboxylic acid dipotassium salt (H 2 K 2 −BPDSDC), which has two sulfonyl and two carboxyl functional groups. Compound 1 is a 3D framework with ribbon-shaped Cu−K chains, regular square channels, unsaturated Lewis acidic Cu(II) ions, and exposed oxygen atoms. PXRD and TGA measurements confirmed that 1 exhibits good chemical and thermal stability. The dye adsorption behavior of compound 1 was explored in detail, which showed that 1 can efficiently and selectively adsorb cationic dye methylene blue (MB). Compound 1 also showed catalytic activity for the cycloaddition reaction of carbon dioxide (CO 2 ) with epoxides. Furthermore, catalyst 1 was easy to recover and reuse, and the catalytic activity did not decrease significantly after 5 cycles. A plausible mechanism for the cycloaddition reaction was also proposed.

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