Rational tuning of thorium-organic frameworks by reticular chemistry for boosting radionuclide sequestration

Autor: Le-Le Gong, Xiaohong Xiong, Ying Xu, Feng Luo, Hui Ping Zhang, Han Feng, Xuefeng Feng
Rok vydání: 2021
Předmět:
Zdroj: Nano Research. 15:1472-1478
ISSN: 1998-0000
1998-0124
DOI: 10.1007/s12274-021-3690-7
Popis: The reticular chemistry strategy presents a powerful molecule-design tool to tailor the physical and chemical properties of metal-organic framework (MOF). In this work, we for the first time investigated the effect of organic ligands on the radionuclide sequestration (TcO4−) of thorium-organic framework. Through a coordination modulation technique, two novel isoreticular thorium-organic frameworks, namely Th-MOF-67 and Th-MOF-68, were obtained. Relative to the antetype MOF of Th-MOF-66 that shows extremely low uptake of ReO4− (a chemical surrogate of radioactive TcO4−), the isoreticular MOFs of Th-MOF-67 and Th-MOF-68 enable ultrahigh uptake of ReO4−, giving an impressively 36.8-fold or 56-fold enhancement, respectively. The adsorption capacity of Th-MOF-68 is as high as 560 mg/g, exceeding most reported adsorbents for such use. The mechanism for such exceptional outstanding performance, as unveiled by both the single crystal X-ray diffraction and theoretical calculation, is due to coordination interaction for Th-MOF-67, when a tetrazolate ligand was used, or a combined effect from both coordination interaction and anion-exchange for Th-MOF-68, if using a triazolate ligand.
Databáze: OpenAIRE
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