Loosening metal nodes in metal-organic frameworks to facilitate the regulation of valence

The valence of metal nodes in metal-organic frameworks (MOFs) determines their performance in applications while developing an efficient approach for valence regulation is challenging. Here we present a strategy to make the valence regulation much easier by loosening metal nodes by thermal pretreatm...

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Bibliographic Details
Published in:Fundamental research (Beijing) 2025-01, Vol.5 (1), p.158-164
Main Authors: Li, Yu-Xia, Shen, Jia-Xin, Diao, Ze-Jiu, Qi, Shi-Chao, Liu, Xiao-Qin, Sun, Lin-Bing
Format: Article
Language:English
Subjects:
Adsorption
Copper
Desulfurization
Metal-organic frameworks
Valence regulation
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Summary:The valence of metal nodes in metal-organic frameworks (MOFs) determines their performance in applications while developing an efficient approach for valence regulation is challenging. Here we present a strategy to make the valence regulation much easier by loosening metal nodes by thermal pretreatment. The typical MOF, HKUST-1, with the tunable valence of Cu nodes, was used as a proof of concept. Thermal pretreatment (producing HK-T) changes the chemical environment and loosens Cu nodes, endowing them with enhanced reducibility. In the subsequent vapor-induced reduction, the yield of Cu+ from Cu2+ conversion in HK-T (producing HK-T-V) reaches 69%, which is higher than that in pristine HKUST-1 (producing HK-V) with a Cu+ yield of 19% as well as the reported yields of target-valence metal nodes in various MOFs (6%–30%). The obtained HK-T-V possessing abundant Cu+ sites can capture 0.809 mmol/g thiophene in adsorptive desulfurization, 2.5 times higher than HK-V and superior to most reported adsorbents. [Display omitted]
ISSN:2667-3258
2667-3258
DOI:10.1016/j.fmre.2022.08.012