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Issue 3, 2016
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Capture of iodine and organic iodides using silica zeolites and the semiconductor behaviour of iodine in a silica zeolite

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Abstract

During the reprocessing of spent nuclear fuel rods, a highly moist off-gas mixture containing various volatile radioactive species, such as iodine (I2), organic iodides and nitric acid, is produced. Efforts have been made to devise materials, which can effectively capture radioactive iodine (I2) and organic iodides from the off-gas mixture without being damaged by moisture, nitric acid, and I2. In the investigation described herein, we observed that all-silica zeolites, such as silicalite-1 and Si-BEA, are stable in 5 M nitric acid and adsorb I2, CH3I, and CH3CH2I from highly acidic off-gas mixture to much greater extents than activated carbon does. In particular, the hydrophobicity-intensified silicalite-1 performs best. We further found that I2 forms a unique semiconducting three-dimensional supramolecular network within the silicalite-1 channels. The conductivity of the fully I2 loaded silicalite-1 is observed to be ca. 104 S m−1, which is ca. 108-fold higher than that of solid I2.

Graphical abstract: Capture of iodine and organic iodides using silica zeolites and the semiconductor behaviour of iodine in a silica zeolite

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Publication details

The article was received on 14 Sep 2015, accepted on 03 Dec 2015 and first published on 09 Dec 2015


Article type: Paper
DOI: 10.1039/C5EE02843D
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Citation: Energy Environ. Sci., 2016,9, 1050-1062

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    Capture of iodine and organic iodides using silica zeolites and the semiconductor behaviour of iodine in a silica zeolite

    T. C. T. Pham, S. Docao, I. C. Hwang, M. K. Song, D. Y. Choi, D. Moon, P. Oleynikov and K. B. Yoon, Energy Environ. Sci., 2016, 9, 1050
    DOI: 10.1039/C5EE02843D

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