TY - JOUR
T1 - Extraction Behavior of Sr (II) from High-Level Liquid Waste using Ionic Liquid Extraction System with DtBuCH18C6
AU - Takahashi, Tadayuki
AU - Ito, Tatsuya
AU - Kim, Seong Yun
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Number 16H02444.
Publisher Copyright:
© 2017 The Authors. Published by Elsevier Ltd.
PY - 2017
Y1 - 2017
N2 - The extraction behavior of Sr(II) from high-level liquid waste (HLLW) has been investigated using 4',4'(5')-di-(tert-butyl cyclohexano)-18-crown-6 (DtBuCH18C6) as an extractant in combination with three types of ionic liquids, [Cnmim][NTf2] (n = 2,4,6) as solvents, where [Cnmim]+ is 1-alkyl-3-methylimidazolium and [NTf2]- is bis(trifluoromethylsulfonyl)amide. DtBuCH18C6 in the [Cnmim][NTf2] system can be used as a good choice for matching, and a higher DSr can be achieved. Within the acidity range studied, the DSr follows the order of [C2mim][NTf2] > [C4mim][NTf2] > [C6mim][NTf2]. In their extraction systems, DSr decreases with increasing concentration of HNO3 in the aqueous phase. Thermodynamic parameters for the extraction of Sr(II) tested elements were calculated using the Van't Hoff equation, showing that the reaction is spontaneous and exothermic. Existence of inorganic salts such as KNO3 usually reduces ESr for all systems, and the decreasing degree is much larger than that of NaNO3. The extraction systems exhibited high extraction efficiency and high selectivity for Sr(II) from simulated HLLW containing 25 typical elements and 2M HNO3. From the results, the DtBuCH18C6 in [Cnmim][NTf2] system may provide an alternative for extraction of Sr(II) under HLLW conditions.
AB - The extraction behavior of Sr(II) from high-level liquid waste (HLLW) has been investigated using 4',4'(5')-di-(tert-butyl cyclohexano)-18-crown-6 (DtBuCH18C6) as an extractant in combination with three types of ionic liquids, [Cnmim][NTf2] (n = 2,4,6) as solvents, where [Cnmim]+ is 1-alkyl-3-methylimidazolium and [NTf2]- is bis(trifluoromethylsulfonyl)amide. DtBuCH18C6 in the [Cnmim][NTf2] system can be used as a good choice for matching, and a higher DSr can be achieved. Within the acidity range studied, the DSr follows the order of [C2mim][NTf2] > [C4mim][NTf2] > [C6mim][NTf2]. In their extraction systems, DSr decreases with increasing concentration of HNO3 in the aqueous phase. Thermodynamic parameters for the extraction of Sr(II) tested elements were calculated using the Van't Hoff equation, showing that the reaction is spontaneous and exothermic. Existence of inorganic salts such as KNO3 usually reduces ESr for all systems, and the decreasing degree is much larger than that of NaNO3. The extraction systems exhibited high extraction efficiency and high selectivity for Sr(II) from simulated HLLW containing 25 typical elements and 2M HNO3. From the results, the DtBuCH18C6 in [Cnmim][NTf2] system may provide an alternative for extraction of Sr(II) under HLLW conditions.
KW - Crown ether
KW - Extraction
KW - High-level liquid waste (HLLW)
KW - Ionic liquid
KW - Strontium
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U2 - 10.1016/j.egypro.2017.09.462
DO - 10.1016/j.egypro.2017.09.462
M3 - Conference article
AN - SCOPUS:85042028028
VL - 131
SP - 170
EP - 177
JO - Energy Procedia
JF - Energy Procedia
SN - 1876-6102
T2 - 5th International Symposium on Innovative Nuclear Energy Systems, INES-5 2016
Y2 - 31 October 2017 through 2 November 2017
ER -