期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 279, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2019.120979
关键词
COFs; Iodine vapor uptake; Conjugated structure; Charge-transfer interaction
资金
- National Science Foundations of China [21871047, 21661001]
- Natural Science Foundation of Jiangxi Province of China [20181ACB20003]
The effective capture and storage of volatile radionuclide iodine from the nuclear waste stream is of great significance for environment remediation. Here we synthetize two types of two-dimensional (2D) covalent organic frameworks (COFs) for iodine vapor uptake, including COF-LZU1 with a whole pi-pi conjugated structure and TpPa-1 with a combination of pi-pi and p-pi conjugated structure. The capacities for iodine vapor uptake are acquired for COF-LZU1 (530 wt%) and TpPa-1 (245 wt%). Thorough studies reveal that the large and intact pi-pi conjugated system formed by phenyl rings and imine (-C=N-) linkers in COF-LZU1 provides materials with ultrahigh iodine vapor uptake by inducing the charge-transfer interactions to transform adsorbed iodine molecules into polyiodide anions. However, the combined ic-conjugated structure in TpPa-1 shows no obvious effect on iodine adsorption enhancement. Hence, this study can provide a guidance for the design and construction of ultrahigh-capacity iodine adsorbents.
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