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

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 genera...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2018-05, Vol.57 (21), p.6042-6048
Main Authors: Lu, Qiuyu, Ma, Yunchao, Li, Hui, Guan, Xinyu, Yusran, Yusran, Xue, Ming, Fang, Qianrong, Yan, Yushan, Qiu, Shilun, Valtchev, Valentin
Format: Article
Language:English
Subjects:
Adsorption
Catalysis
cations
Chemical Sciences
covalent organic frameworks
Functional groups
functionalization
Iron
Material chemistry
porous materials
Surface stability
X-ray diffraction
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Summary: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. ′COF′ it up: Reported here is a general strategy for generating three‐dimensional (3D) carboxy‐functionalized covalent organic frameworks (COFs) through postsynthetic modification of a hydroxy‐functionalized COFs. The resulting COFs were used for the first time to explore the selective extraction of lanthanide ions.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201712246