Natural Ellagic Acid-Derived Nanoporous Organic Polymers for CO₂ and Organic Dye Adsorption

The utilization of natural renewable molecules to fabricate functional materials is of great significance. In this work, two bioinspired porous organic polymers (POPs), namely, EA-TAPB and EA-TAPT, were easily prepared from ellagic acid (EA) and C 3 -symmetric amines via an aqueous diazo-coupling strategy. Both azo-linked POPs exhibit good stability and possess a hierarchical nanoporous structure with abundant neighboring phenol groups. Benefiting from these, the as-prepared POPs showed excellent performances in the selective capture of CO 2 and in the charge-selective adsorption of dyes. Particularly, the superhydrophilicity of EA groups in these azo-linked POPs renders them with ultrafast removal ability of cationic dyes from water. The pseudo-second-order constants of EA-TAPB are 47.314 and 12.300 g mg –1 min –1 for MB and RhB, respectively, which are superior to those reported adsorption materials. This work represents an effective approach to constructing low-cost functional POPs for task-specific applications.