Th (IV) and U(VI) removal by TODGA in ionic liquids: Extraction behavior and mechanism, and radiation effect

Zhen Dong; Wei-Jin Yuan; Chao Liu; Long Zhao; Chao Zhao; Fang-Dong Tang; Lin-Feng He

doi:10.1007/s41365-017-0214-y

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Th (IV) and U(VI) removal by TODGA in ionic liquids: Extraction behavior and mechanism, and radiation effect

NUCLEAR CHEMISTRY, RADIOCHEMISTRY, NUCLEAR MEDICINE | Updated：2021-02-23

- Th (IV) and U(VI) removal by TODGA in ionic liquids: Extraction behavior and mechanism, and radiation effect
- Nuclear Science and Techniques Vol. 28, Issue 5, Article number: 62(2017)
- Affiliations：
  
  1.Non-power Nuclear Technology Collaborative Innovation Center, School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, Xianning 437100, China
  2.School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  3.Division of Chemistry and Ionizing Radiation Measurement Technology, Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, China
- Author bio：
  
  Long Zhao ryuuchou@hotmail.com
- Funds：
- DOI：10.1007/s41365-017-0214-y
  CLC：
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Zhen Dong, Wei-Jin Yuan, Chao Liu, et al. Th (IV) and U(VI) removal by TODGA in ionic liquids: Extraction behavior and mechanism, and radiation effect. [J]. Nuclear Science and Techniques 28(5):62(2017)
DOI：

Zhen Dong, Wei-Jin Yuan, Chao Liu, et al. Th (IV) and U(VI) removal by TODGA in ionic liquids: Extraction behavior and mechanism, and radiation effect. [J]. Nuclear Science and Techniques 28(5):62(2017) DOI： 10.1007/s41365-017-0214-y.

摘要

Abstract

Extraction behavior of thorium(IV) and uranium(VI) from nitric acid (HNO,3,) was studied using N,N,N’,N’-Tetraoctyldiglycolamide (TODGA) as extractant in different ionic liquids, and isooctane as comparison. Slope analyses with varying HNO,3, concentrations and diluents revealed the extraction mechanism. With increasing length of alkyl chain and HNO,3, concentration, the extraction mechanism of TODGA/IL system changed from cation exchange to neutral complex or/and anion exchange, and the molar ratio between TODGA and metal ions varied gradually from 2:1 to 1:1 for Th(IV) and 3:1 to 1:1 for U(VI). The kinetics and thermodynamic studies of Th(IV) and U(VI) by the best TODGA/[C,2,mim][NTf,2,] system showed that the exaction reached equilibrium within 2 h and extraction reactions were endothermic. Compared to TODGA/isooctane system, TODGA/[C,2,mim][NTf,2,] system presented higher radiation stability under γ-irradiation. Therefore, it would have a promising application in spent fuel reprocessing.

关键词

Keywords

ExtractionTODGAIonic liquidsThorium(IV) and Uranium(VI)Radiation effect

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Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics

Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory for Fundamental Science, College of Chemistry and Molecular Engineering, Peking University

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Nuclear Chemical Engineering Laboratory, School of Nuclear Science and Engineering, Shanghai Jiao Tong University

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