TY - JOUR
T1 - Challenges to develop single-column MA(III) separation from HLLW using R-BTP type adsorbents
AU - Usuda, Shigekazu
AU - Wei, Yuezhou
AU - Liu, Ruiqin
AU - Li, Zheng
AU - Xu, Yuanlai
AU - Wu, Yan
AU - Kim, Seongyun
N1 - Funding Information:
A part of this study is the results of “Development of a Simplified MA Separation Process Using Novel R-BTP Adsorbents” carried out under the Strategic Promotion Program for Basic Nuclear Research by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT).
PY - 2012/9
Y1 - 2012/9
N2 - In order to directly separate trivalent minor actinides (MA: Am, Cm) from fission products (FP) containing rare earths (RE) in high level radioactive liquid waste (HLLW), the authors have challenged to develop a simplified MA separation process by extraction chromatography using a single column. Attention has been paid to a new type of nitrogen-donor ligands, R-BTP (2,6-bis(5,6-dialkyl-1,2,4-triazin-3-yl) pyridine, R: alkyl group) as an extractant because it shows high extraction selectivity for Am(III) over RE(III). It is known that the R-BTP ligands show different properties such as adsorbability and stability by having different alkyl groups. Therefore, some novel adsorbents were prepared by impregnating different types of R-BTP ligands (isohexyl-, isoheptyl- and cyheptyl-BTP) and a similar ligand to the R-BTP, ATP (2,6-bis(1-aryl-1H-tetrazol-5-yl)pyridines), into the porous silica/polymer support (SiO 2-P particles). This work deals with comparison in adsorption and desorption properties of Am and some FP in HNO 3 solution onto such R-BTP type adsorbents, as well as chemical and radiolytic stability of the adsorbents. Then the possibility of a single-column separation of MA from main FP was pursued by evaluating the results of column experiments using the most promising adsorbent (isohexyl-BTP/SiO 2-P) under temperature control. In addition, elution behaviors of U and Pd were also estimated.
AB - In order to directly separate trivalent minor actinides (MA: Am, Cm) from fission products (FP) containing rare earths (RE) in high level radioactive liquid waste (HLLW), the authors have challenged to develop a simplified MA separation process by extraction chromatography using a single column. Attention has been paid to a new type of nitrogen-donor ligands, R-BTP (2,6-bis(5,6-dialkyl-1,2,4-triazin-3-yl) pyridine, R: alkyl group) as an extractant because it shows high extraction selectivity for Am(III) over RE(III). It is known that the R-BTP ligands show different properties such as adsorbability and stability by having different alkyl groups. Therefore, some novel adsorbents were prepared by impregnating different types of R-BTP ligands (isohexyl-, isoheptyl- and cyheptyl-BTP) and a similar ligand to the R-BTP, ATP (2,6-bis(1-aryl-1H-tetrazol-5-yl)pyridines), into the porous silica/polymer support (SiO 2-P particles). This work deals with comparison in adsorption and desorption properties of Am and some FP in HNO 3 solution onto such R-BTP type adsorbents, as well as chemical and radiolytic stability of the adsorbents. Then the possibility of a single-column separation of MA from main FP was pursued by evaluating the results of column experiments using the most promising adsorbent (isohexyl-BTP/SiO 2-P) under temperature control. In addition, elution behaviors of U and Pd were also estimated.
KW - Adsorbability and stability
KW - Fission products (FP)
KW - R-BTP/SiO -P type adsorbents
KW - Rare earths (RE)
KW - Single-column separation
KW - Temperature control
KW - Trivalent minor actinides (MA)
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U2 - 10.1007/s11426-012-4691-x
DO - 10.1007/s11426-012-4691-x
M3 - Article
AN - SCOPUS:84866072499
VL - 55
SP - 1732
EP - 1738
JO - Science China Chemistry
JF - Science China Chemistry
SN - 1674-7291
IS - 9
ER -