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Article Abstract
Used nuclear fuel reprocessing represents a unique challenge when dealing with radionuclides such as isotopes of Kr and I due to their volatility and long half-life. Efficient capture of I ( t = 15.7 × 10 years) from the nuclear waste stream can help reduce the risk of releasing I radionuclide into the environment and/or potential incorporation into the human thyroid. Metal organic frameworks have the reported potential to be I adsorbents but the effect of water vapor, generally present in the reprocessing off-gas stream, is rarely taken into account. Moisture-stable porous metal organic frameworks that can selectively adsorb I in the presence of water vapor are thus of great interest. Herein, we report on the I adsorption capacity of two microporous metal organic frameworks at both dry and humid conditions. Single-crystal X-ray diffraction and Raman spectroscopy reveal distinct sorption sites of molecular I within the pores in proximity to the phenyl- and phenol-based linkers stabilized by the I···π and I···O interactions, which allow selective uptake of iodine.
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| http://dx.doi.org/10.1021/acsami.8b02651 | DOI Listing |
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