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

The utilization of natural renewable molecules to fabricatefunctionalmaterials is of great significance. In this work, two bioinspiredporous organic polymers (POPs), namely, EA-TAPB and EA-TAPT, wereeasily prepared from ellagic acid (EA) and C-3-symmetricamines via an aqueous diazo-coupling strategy. Both azo-linked POPsexhibit good stability and possess a hierarchical nanoporous structurewith abundant neighboring phenol groups. Benefiting from these, theas-prepared POPs showed excellent performances in the selective captureof CO2 and in the charge-selective adsorption of dyes.Particularly, the superhydrophilicity of EA groups in these azo-linkedPOPs renders them with ultrafast removal ability of cationic dyesfrom water. The pseudo-second-order constants of EA-TAPB are 47.314and 12.300 g mg(-1) min(-1) for MBand RhB, respectively, which are superior to those reported adsorptionmaterials. This work represents an effective approach to constructinglow-cost functional POPs for task-specific applications.