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Postsynthetic Functionalization of Three-Dimensional Covalent Organic Frameworks for Selective Extraction of Lanthanide Ions

Abstract : Chemical functionalization of covalent organic frameworks (COFs) is critical for tuning their properties and broadening their potential applications. However, the introduction of functional groups, especially to three-dimensional (3D) COFs, still remains largely unexplored. Reported here is a general strategy for generating a 3D carboxy-functionalized COF through postsynthetic modification of a hydroxy-functionalized COF, and for the first time exploration of the 3D carboxy-functionalized COF in the selective extraction of lanthanide ions. The obtained COF shows high crystallinity, good chemical stability, and large specific surface area. Furthermore, the carboxy-functionalized COF displays high metal loading capacities together with excellent adsorption selectivity for Nd3+ over Sr2+ and Fe3+ as confirmed by the Langmuir adsorption isotherms and ideal adsorbed solution theory (IAST) calculations. This study not only provides a strategy for versatile functionalization of 3D COFs, but also opens a way to their use in environmentally related applications.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-01728291
Contributor : Christian Fernandez <>
Submitted on : Saturday, March 10, 2018 - 1:46:29 PM
Last modification on : Thursday, February 13, 2020 - 11:06:11 AM

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Qiuyu Qiu, Yunchao Ma, Hui Li, Xinyu Guan, Yusran Yusran, et al.. Postsynthetic Functionalization of Three-Dimensional Covalent Organic Frameworks for Selective Extraction of Lanthanide Ions. Angewandte Chemie International Edition, Wiley-VCH Verlag, 2018, 57 (21), pp.6042-6048. ⟨10.1002/anie.201712246⟩. ⟨hal-01728291⟩

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