Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE Synthesized Tröger's based POPs showed great versatility in heterogeneous catalysis reactions and for pollutant adsorption.


ABSTRACT
Porous organic polymers are a new class of polymeric materials that combine permanent porosity, high surface area, monomer diversity, and synthetic tunability, making them highly promising candidates for application in heterogeneous catalysis and pollutant removal from aqueous solution. Herein, three Tröger's base-linked POPs were prepared using 1,3,5-tris(4-aminophenyl)triazine, benzidine, or 4,4′-diamino-[1,1′-biphenyl]-2,2′-disulfonic acid, to obtain TAPT-Tr-POP, TAPT-Bd-Tr-POP, and TAPT-Bd(SO3Na)2-Tr-POP. The polymers exhibited BJH average pore diameters ranging from 1.4 to 27.0 nm, BET surface areas up to 177 ± 8 m2 g−1, and thermal stabilities up to 213°C. The POPs were tested as heterogeneous catalysts in the metal-free Henry and Knoevenagel reactions, between aromatic aldehydes and nitromethane and ethyl cyanoacetate, respectively, with moderate to virtually complete conversions. The three POPs were subsequently used as solid adsorbents for the removal of the organic pollutants methylene blue (MB), crystal violet (CV), phenol red (Phr), and phenol (PhOH), with the sulfonated material TAPT-Bd(SO3Na)2-Tr-POP exhibiting maximum adsorption capacities up to 700 ± 234 and 522 ± 72 mg g−1 toward the adsorption of MB and CV, respectively. The obtained results showcase the enormous potential of Tröger's base-linked polymers as versatile new materials for greener, more sustainable catalysis and environmental remediation.