Selective capture of iodate anions by a cerium-based metal-organic framework

Selective capture of iodate anions by a cerium-based metal-organic framework

Effective remediation of radioactive IO<sub>3</sub><sup>−</sup> is highly desirable for fuel reprocessing, medical waste disposal, and nuclear accidents. However, the nature of high solubility, strong mobility, and extremely hard to bind with minerals for IO<sub>3</s...

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Bibliographic Details
Main Authors: Zhao Yuting, Li Jie, Chen Long, Guo Qi, Li Lingyi, He Linwei, Zhai Fuwan, Zhang Mingxing, Chai Zhifang, Wang Shuao
Format: Article
Language:English
Published: Science Press 2024-09-01
Series:National Science Open
Subjects:
iodate
metal-organic framework
selectivity
distribution coefficient
adsorption
Online Access:https://www.sciengine.com/doi/10.1360/nso/20240003
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Summary:Effective remediation of radioactive IO<sub>3</sub><sup>−</sup> is highly desirable for fuel reprocessing, medical waste disposal, and nuclear accidents. However, the nature of high solubility, strong mobility, and extremely hard to bind with minerals for IO<sub>3</sub><sup>−</sup> makes this task an enormous challenge. Herein, a metal-organic framework material [Ce(IV)-MOF-808] with available Ce(IV) sites was used to efficiently remove IO<sub>3</sub><sup>−</sup>. Ce(IV)-MOF-808 exhibits superior selectivity and one of the highest adsorption capacities <sc>(623 mg·g<sup>−1</sup>)</sc> for IO<sub>3</sub><sup>−</sup> removal. Moreover, Ce(IV)-MOF-808 shows great adsorption performance for IO<sub>3</sub><sup>−</sup> at low concentrations, and the distribution coefficient (K<sub>d</sub>) value was calculated to be 2.60 × <sc>10<sup>6</sup> mL·g<sup>−1</sup>.</sc> The exceptional IO<sub>3</sub><sup>−</sup> uptake performance is attributed to the high affinity between Ce(IV) cluster and the oxyanion based on the comprehensive analysis of zeta potential and X-ray photoelectron spectroscopy (XPS) results, in which IO<sub>3</sub><sup>−</sup> can easily replace the weakly coordinated ligand and form a strong coordination structure of Ce-O-I-O<sub>2</sub>. More importantly, Ce(IV)-MOF-808 exhibits excellent uptake performance for IO<sub>3</sub><sup>−</sup> from both the simulated Beishan groundwater system and Hanford groundwater system in the dynamic column separation test, indicating the highly promising practical application of Ce(IV)-MOF-808 in IO<sub>3</sub><sup>−</sup> remediation from actual radioactive wastes.
ISSN:2097-1168

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