Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 328, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2023.125054
Keywords
Covalent organic framework; Iodine capture; Ethynyl site; Triazine site
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In this study, a rational modulation of active sites within COFs was reported to enhance the iodine capture performance. The incorporation of electron-rich ethynyl moieties and rich basic triazine sites led to a significant increase in iodine adsorption capacity, offering new possibilities for the design and synthesis of novel COF-based adsorbents for separation applications.
The search and development of novel covalent organic frameworks (COFs) as advanced adsorbents for efficient capture of radiological iodine is of great interest. Herein, a rational modulation of active sites within COFs was reported to achieve enhanced iodine capture performance. A facile installation of electron-rich ethynyl moieties within backbones of the COF adsorbent led to a successful 38% rise of iodine adsorption capacity, from 3.34 g g-1 to 4.61 g g-1, due to the intrinsic strong interaction between ethynyl sites and iodine molecules. Moreover, this uptake can be further enhanced to be 5.07 g g-1 through the incorporation of rich basic triazine sites into the ethynyl-linked framework on account of the Lewis acidity of iodine. These results not only give a rise to extend our understanding of structure-property relationship for efficient removal of radiological iodine, but also offer new possibilities for the rational design and synthesis of novel COF-based adsorbents for separation applications.
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