Publication

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

조회수 : 224 등록일 : 2016.07.14 00:00

저자 : Pham, TCT (Tung Cao Thanh Pham), Yoon, KB (Yoon, Kyung Byung)
출처 : ENERGY & ENVIRONMENTAL SCIENCE
출판일 : 2016.07.01
 
 
Capture of iodine and organic iodides using silica zeolites and the semiconductor behaviour of iodine in a silica zeolite
 
 
Pham, TCT (Tung Cao Thanh Pham)[ 1 ] ; Docao, S (Docao, Son)[ 1 ] ; Hwang, IC (Hwang, In Chul)[ 1 ] ; Song, MK (Song, Mee Kyung)[ 1 ] ; Choi, DY (Choi, Do Young)[ 1 ] ; Moon, D (Moon, Dohyun)[ 2 ] ; Oleynikov, P (Oleynikov, Peter)[ 3 ] ; Yoon, KB (Yoon, Kyung Byung)[ 1 ]
 
 
[ 1 ] Sogang Univ, Dept Chem, Ctr Nanomat, Korea Ctr Artificial Photosynth, Seoul 121742, South Korea
[ 2 ] Pohang Accelerator Lab, Supramol Small Mol Crystallog, San 31 Hyoja Dong, Pohang 790784, Kyungbuk, South Korea
[ 3 ] Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden
 
 
 
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.
 
 
 
 
 
 
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