Solvent Extraction of Uranium (VI) from Chloride Solutions using Cyphos IL-101

被引：12
作者：
Quinn, James E. [1 ]
Ogden, Mark D. [1 ]
Soldenhoff, Karin [1 ]
机构：
[1] Australian Nucl Sci & Technol Org ANSTO Minerals, Kirrawee Dc, NSW 2232, Australia
来源：
SOLVENT EXTRACTION AND ION EXCHANGE | 2013年 / 31卷 / 05期
关键词：
uranium(VI); solvent extraction; phosphonium ion; cyphos IL-101; ionic liquid; HYDROCHLORIC-ACID SOLUTIONS; PHOSPHONIUM IONIC LIQUID; HEXAVALENT ACTINIDES; BIOPOLYMER CAPSULES; PICKLING SOLUTIONS; IRON IONS; RECOVERY; ZINC(II); COMPLEXES; PALLADIUM(II);
D O I：
10.1080/07366299.2013.775891
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The solvent extraction of uranium (VI) from chloride solutions by Cyphos IL-101 in xylene has been studied. Distribution coefficients were found to increase with aqueous chloride concentration and extractant concentration. The enthalpy of extraction is endothermic with Delta H = +24 +/- 2 kJmol(-1). Based upon slope analysis, an anion exchange extraction mechanism is proposed, with formation of a UO2Cl42- complex in association with 4 Cyphos IL-101 ligands. The extraction kinetics were fast, with complete equilibration occurring within 30 seconds. An isotherm for uranium extraction from 1.0 molL(-1) chloride solution by 0.1 molL(-1) Cyphos IL-101 in xylene shows that 45 mmolL(-1) uranium can be loaded into the organic phase in equilibrium with 2.1 mmolL(-1) in the aqueous phase. The absorption spectrum of the uranium loaded solvent between 350 and 550 nm is indicative of the UO2Cl42- complex with only chlorides present in the inner coordination sphere, unlike the more strongly hydrogen bonded Alamine 336 extracted uranium complex. Subject to the same experimental conditions, distribution coefficients for Cyphos IL-101 were significantly greater than for Alamine 336 or Aliquat 336.
引用
收藏
页码：538 / 549
页数：12
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