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.