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- Title
Irreversible Amide‐Linked Covalent Organic Framework for Selective and Ultrafast Gold Recovery.
- Authors
Qian, Hai‐Long; Meng, Fan‐Lin; Yang, Cheng‐Xiong; Yan, Xiu‐Ping
- Abstract
Design of stable adsorbents for selective gold recovery with large capacity and fast adsorption kinetics is of great challenge, but significant for the economy and the environment. Herein, we show the design and preparation of an irreversible amide‐linked covalent organic framework (COF) JNU‐1 via a building block exchange strategy for efficient recovery of gold. JNU‐1 was synthesized through the exchange of 4,4′‐biphenyldicarboxaldehyde (BA) in mother COF TzBA consisting of 4,4′,4′′‐(1,3,5‐triazine‐2,4,6‐triyl)trianiline (Tz) and BA with terephthaloyl chloride. The irreversible amide linked JNU‐1 gave good stability, unprecedented fast kinetics, excellent selectivity and outstanding adsorption capacity for gold recovery. X‐ray photoelectron spectroscopy along with thermodynamic study and quantum mechanics calculation reveals that the excellent performance of JNU‐1 for gold recovery results from the formation of hydrogen bonds C(N)−H⋅⋅⋅Cl and coordinate interaction of O and Au. The rational design of irreversible bonds as both inherent linkage and functional groups in COFs is a promising way to prepare stable COFs for diverse applications.
- Subjects
X-ray photoelectron spectroscopy; ADSORPTION kinetics; QUANTUM mechanics; HYDROGEN bonding; ADSORPTION capacity
- Publication
Angewandte Chemie, 2020, Vol 132, Issue 40, p17760
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202006535