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

• Published in: Advanced functional materials Vol. 33; no. 33
• Main Authors: Liu, Minghao, Kong, Hui‐Yuan, Bi, Shuai, Ding, Xuesong, Chen, George Zheng, He, Jun, Xu, Qing, Han, Bao‐Hang, Zeng, Gaofeng
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 01.08.2023
• Subjects: 3D topology; Au ions recovery; Covalence; covalent organic frameworks; gas sorption; Materials science; Surface area; Topology
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.202302637

The 3D covalent organic frameworks (COFs) have attracted considerable attention owing to their unique structural characteristics. However, most of 3D COFs have interpenetration phenomena, which will result in decreased surface area and porosities, and thus limited their applications in molecular/gas capture. Developing 3D COFs with non‐fold interpenetration is challenging but significant because of the existence of non‐covalent interactions between the adjacent nets. Herein, a new 3D COF (BMTA‐TFPM‐COF) with dia topology and non‐fold interpenetration for Au ion capture is first demonstrated. The constructed COF exhibits a high Brunauer–Emmett–Teller surface area of 1924 m2 g−1, with the pore volume of 1.85 cm3 g−1. The high surface area and abundant cavities as well as the abundant exposed CN linkages due to the non‐interpenetration enable to absorb Au3+ with high capacity (570.18 mg g−1), selectivity (99.5%), and efficiency (68.3% adsorption of maximum capacity in 5 min). This work provides a new strategy to design 3D COFs for ion capture. A new non‐interpenetrated 3D covalent organic framework (COF) is first constructed for Au ions capture. The COF has high surface areas, good crystallinity, and adopts the dia topology with non‐fold interpenetration. By virtue of these features, the COF enable to trap the Au3+ with high efficiency.