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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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Number of Authors: 8
2016 (English)In: Energy & Environmental Science, ISSN 1754-5692, E-ISSN 1754-5706, Vol. 9, no 3, 1050-1062 p.Article in journal (Refereed) Published
Abstract [en]

During the reprocessing of spent nuclear fuel rods, a highly moist off-gas mixture containing various volatile radioactive species, such as iodine (I-2), organic iodides and nitric acid, is produced. Efforts have been made to devise materials, which can effectively capture radioactive iodine (I-2) and organic iodides from the off-gas mixture without being damaged by moisture, nitric acid, and I-2. 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 I-2, 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 I-2 forms a unique semiconducting three-dimensional supramolecular network within the silicalite-1 channels. The conductivity of the fully I-2 loaded silicalite-1 is observed to be ca. 10(4) S m(-1), which is ca. 10(8)-fold higher than that of solid I-2.

Place, publisher, year, edition, pages
2016. Vol. 9, no 3, 1050-1062 p.
National Category
Chemical Sciences Environmental Engineering Chemical Engineering Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-129096DOI: 10.1039/c5ee02843dISI: 000372243600035OAI: oai:DiVA.org:su-129096DiVA: diva2:922418
Available from: 2016-04-22 Created: 2016-04-14 Last updated: 2016-04-22Bibliographically approved

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Oleynikov, Peter
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Department of Materials and Environmental Chemistry (MMK)
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