A sustainable strategy for targeted extraction of thorium from radioactive waste leachate based on hydrophobic deep eutectic solvent,Journal of Hazardous Materials

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A sustainable strategy for targeted extraction of thorium from radioactive waste leachate based on hydrophobic deep eutectic solvent
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2023-09-02 , DOI: 10.1016/j.jhazmat.2023.132465
Shuainan Ni ₁ , Yun Gao ₂ , Guisu Yu ₂ , Sijia Zhang ₃ , Zhiyuan Zeng ₁ , Xiaoqi Sun ₄

Affiliation

CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China; Fujian Research Center for Rare Earth Engineering Technology, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen 361021, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China; Fujian Research Center for Rare Earth Engineering Technology, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen 361021, PR China.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China; Fujian Research Center for Rare Earth Engineering Technology, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen 361021, PR China; Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, Jiangxi 341000, PR China.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China; Fujian Research Center for Rare Earth Engineering Technology, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen 361021, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, Jiangxi 341000, PR China.

In this work, the new hydrophobic deep eutectic solvents (HDESs) based on 2-hexyldecanoic acid (HDA) as a hydrogen bond donor (HBD) were used to selectively enrich trace Th from radioactive waste leach solution. These HDESs are characterized by low toxicity, bio-friendliness, low viscosity and sufficient hydrophobicity. Compared with Al, Mg, Ca and RE, HDESs exhibited exceptional selectivity for Th extraction, along with high loading capacity, easy stripping and stable reusability. The mechanism of Th extraction by the HDES is a cation exchange reaction. Based on the thymol (TL):HDA (1:3) HDES, a short flow closed-loop recovery process of Th in the leach solution of radioactive waste residue was developed. After a single-step extraction, the extraction percentage (E%) of Th exceeded 98.0%, while the E% of other elements was less than 0.14%. After stripping, the concentration of Th in the concentrated solution reached 2.16 × 103 mg/L with a purity of 74.2%, which could be directly used for subsequent purification. By adjusting the pH to 4.00, the raffinate was used as a feed solution for RE elements recovery. The HDES-based extraction strategy for Th is simple, safe, efficient and environmentally friendly, providing a new idea for the recovery of radioactive waste residues.

中文翻译：

一种基于疏水性深共熔溶剂从放射性废液中靶向提取钍的可持续策略

在本工作中，基于2-己基癸酸（HDA）作为氢键供体（HBD）的新型疏水性共熔溶剂（HDESs）用于选择性富集放射性废物浸出液中的痕量Th。这些 HDES 具有低毒性、生物友好性、低粘度和足够的疏水性。与 Al、Mg、Ca 和 RE 相比，HDESs 对 Th 萃取表现出优异的选择性，以及高负载量、易剥离和稳定的可重用性。HDES 提取 Th 的机制是阳离子交换反应。基于百里香酚（TL）：HDA （1：3） HDES，开发了一种放射性废渣浸出液中 Th 的短流程闭环回收工艺。单步提取后，Th 的提取百分比（E%）超过 98.0%，而其他元素的 E% 小于 0.14%。剥离后，浓液中 Th 的浓度达到 2.16 × 103 mg/L，纯度为 74.2%，可直接用于后续纯化。通过将 pH 值调节至 4.00，抽余液被用作回收稀土元素的进料溶液。基于 HDES 的 Th 提取策略简单、安全、高效、环保，为放射性废渣的回收提供了新思路。

更新日期：2023-09-02

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