Efficient and selective capture of thorium ions by a covalent organic framework

Xiaojuan Liu, Feng Gao, Tiantian Jin, Ke Ma, Haijiang Shi, Ming Wang, Yanan Gao, Wenjuan Xue, Jing Zhao (), Songtao Xiao (), Yinggen Ouyang () and Guoan Ye ()
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Xiaojuan Liu: China Institute of Atomic Energy
Feng Gao: China Institute of Atomic Energy
Tiantian Jin: China Institute of Atomic Energy
Ke Ma: China Institute of Atomic Energy
Haijiang Shi: China Institute of Atomic Energy
Ming Wang: Hainan University
Yanan Gao: Hainan University
Wenjuan Xue: Tiangong University
Jing Zhao: China Institute of Atomic Energy
Songtao Xiao: China Institute of Atomic Energy
Yinggen Ouyang: China Institute of Atomic Energy
Guoan Ye: China Institute of Atomic Energy

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The selective separation of thorium from rare earth elements and uranium is a critical part of the development and application of thorium nuclear energy in the future. To better understand the role of different N sites on the selective capture of Th(IV), we design an ionic COF named Py-TFImI-25 COF and its deionization analog named Py-TFIm-25 COF, both of which exhibit record-high separation factors ranging from 102 to 105. Py-TFIm-25 COF exhibits a significantly higher Th(IV) uptake capacity and adsorption rate than Py-TFImI-25 COF, which also outperforms the majority of previously reported adsorbents. The selective capture of Py-TFImI-25 COF and Py-TFIm-25 COF on thorium is via Th-N coordination interaction. The prioritization of Th(IV) binding at different N sites and the mechanism of selective coordination are then investigated. This work provides an in-depth insight into the relationship between structure and performance, which can provide positive feedback on the design of novel adsorbents for this field.

Date: 2023
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DOI: 10.1038/s41467-023-40704-0

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