Non-Interpenetrated 3D Covalent Organic Framework with Dia Topology for Au Ions Capture

摘要

The 3D covalent organic frameworks (COFs) have attracted considerableattention owing to their unique structural characteristics. However, most of3D COFs have interpenetration phenomena, which will result in decreasedsurface area and porosities, and thus limited their applications in molecular/gas capture. Developing 3D COFs with non-fold interpenetration is challengingbut significant because of the existence of non-covalent interactions betweenthe adjacent nets. Herein, a new 3D COF (BMTA-TFPM-COF) with dia topologyand non-fold interpenetration for Au ion capture is first demonstrated. Theconstructed COF exhibits a high Brunauer–Emmett–Teller surface area of1924 m~2 g~(?1), with the pore volume of 1.85 cm~3 g~(?1). The high surface area andabundant cavities as well as the abundant exposed CN linkages due to thenon-interpenetration enable to absorb Au~(3+) with high capacity (570.18 mg g~(?1)),selectivity (99.5%), and efficiency (68.3% adsorption of maximum capacity in5 min). This work provides a new strategy to design 3D COFs for ion capture.