Bismuth-embedded SBA-15 mesoporous silica for radioactive iodine capture and stable storage

Efficient capture and stable storage of the long-lived iodine-129 (I-129), released as off-gas from nuclear fuel reprocessing, have been of significant concern in the waste management field. In this study, bismuth-embedded SBA-15 mesoporous silica was firstly applied for iodine capture and storage. SBA-15 was functionalized with thiol (-SH) groups, followed by bismuth adsorption with Bi-S bonding, which was thermally treated to form Bi2S3 within SBA-15. The bismuth-embedded SBA-15s demonstrated high iodine loading capacities (up to 540 mg-l/g-sorbent), which benefitted from high surface area and porosity of SBA-15 as well as the formation of thermodynamically stable BiI3 compound. Iodine physisorption was effectively suppressed due to the large pores present in SBA-15, resulting in chemisorption as a main mechanism for iodine confinement. Furthermore, a chemically durable iodine-bearing material was made with a facile post-sorption process, during which the iodine-incorporated phase was changed from BiI3 to chemically durable Bi5O7I. Thus, our results showed that both efficient capture and stabilization of 1291 would be possible with the bismuth-embedded SBA-15, in contrast to other sorbents mainly focused on iodine capture.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2015-10
Language
ENG
Citation

JOURNAL OF NUCLEAR MATERIALS, v.465, pp.556 - 564

ISSN
0022-3115
DOI
10.1016/j.jnucmat.2015.06.043
URI
http://hdl.handle.net/10203/208507
Appears in Collection
NE-Journal Papers(저널논문)
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