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

Abstract

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 C3-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 CO2 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.

Efficient Photocatalytic CO2 Reduction in Ellagic Acid–Based Covalent Organic Frameworks

“…Covalent porous organic framework materials based on metal phthalocyanine possessing M-N 4 ( M = Co, Cu, Ni) active sites have gained significant attention as single-atom catalysts for CO 2 reduction. ,− The 18π aromatic macrocyclic structure of metal phthalocyanine imparts excellent photosensitivity, coupled with remarkable light absorption and photoelectron conversion capabilities . Besides, ellagic acid (EA), characterized by numerous phenolic hydroxyl groups within its molecular structure, can be found in various plants like strawberries, grapes, raspberries, and vegetables. − These features confer upon EA notable hydrophilicity, stability, structural rigidity, and gas adsorption capabilities. EA can effectively integrate with other structural units to construct innovative COFs, metal–organic frame-works, and porous organic polymers. − Consequently, EA serves as a promising avenue for building blocks selected in COF design and the potential applications investigating innovative COFs, particularly in catalysis.…”

“…Besides, ellagic acid (EA), characterized by numerous phenolic hydroxyl groups within its molecular structure, can be found in various plants like strawberries, grapes, raspberries, and vegetables. − These features confer upon EA notable hydrophilicity, stability, structural rigidity, and gas adsorption capabilities. EA can effectively integrate with other structural units to construct innovative COFs, metal–organic frame-works, and porous organic polymers. − Consequently, EA serves as a promising avenue for building blocks selected in COF design and the potential applications investigating innovative COFs, particularly in catalysis.…”

Azo-Linked Porous Polycalix[n]arenes for the Efficient Removal of Organic Micropollutants from Water

“…Porous organic polymers (POPs) belong to a type of porous materials composed entirely of organic building blocks, which are connected by covalent bonds to form networks. − Benefiting from the diversity of organic building blocks and connection methods, numerous POPs have been explored and have shown great potential in various fields, including adsorption, − sensing, , and catalysis. − Recently, macrocycle-based POPs emerged as a new generation of adsorbents for water treatment. ,− Integrating macrocycles into POP networks was considered as an effective strategy to improve binding with regard to host–guest interactions. − …”