Abstract
Radioactive iodine is a very important pollutant among the radioactive nuclear waste gases because of its easy volatile, high biocompatibility and mobility. Once leaking into the environment, it will bring huge harm to ecology environment. Therefore, the development of high efficient adsorption materials for iodine is of great significance. Covalent organic framework (COF) is a kind of novel porous crystal polymer with highly flexible molecular designability and regulable channel structure. COF containing nitrogen-rich structure and electron-rich π-π conjugated system can provide effective binding sites for iodine adsorption, and is a potential adsorption material. In this paper, a nitrogen-rich monomer, 2,4,6-tris(4-formylphenoxy)-1,3,5-triazine (TPT-CHO) was chosen to construct a new nitrogen-rich COF (TPT-DMB COF) through the condensation of aldehyde and amine. It was found by adsorption experiments that TPT-DMB COF showed large capacity, high efficiency and reversible adsorption properties for volatile iodine. The maximum adsorption capacity can reach 5150 mg g−1, higher than that of most reported adsorption materials. The advantages endow the material with great application prospects in the field of enrichment and separation of radioactive iodine.
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