Construction of Large-Pore Crystalline Covalent Organic Framework as High-Performance Adsorbent for Rhodamine B Dye Removal

Covalent organic frameworks (COFs) endowed with predesignable porous structures have shown great promise for addressing environmental issues. Herein, we described the synthesis and characterization of a novel triazine-based two-dimensional COF Ttba-TPDA-COF with accessible 5.8 nm large pore, which then used as a porous adsorbent for the static and dynamic adsorption of Rhodamine B dye from aqueous solution. The obtained large-pore COF with high surface area, uniform mesopore environment, and structural stability achieved an impressive performance that contains saturation capacity of 833 mg g–1, kinetic efficiency, durability over pH and salt concentration, and good sustainable capability. In addition, a superior dynamic adsorption behavior of Ttba-TPDA-COF compared to commercial activated carbon was found in a column system. These results suggest the great potential of COFs as designable porous materials for various environmental remediation applications.