Construction of cationic covalent organic framework for efficient gold extraction

Abstract

In this work, we report a rare ionic covalent organic framework (named as ECUT-iCOF-5) synthesized by the Knoevenagel reaction using an ionic liquid monomer. ECUT-iCOF-5 is found to show a promising potential for gold extraction with a high extraction ability towards gold, including a high extraction capacity (3260 mg g⁻¹), good selectivity over both cations and anions, and good recycle use (at least six times).