Adaptive per-hydroxy pillar[5]arene-based frameworks for selective CO2 adsorption under humid conditions

This study presents a systematic investigation of per -hydroxy pillar [5] arene (P [5] A-OH) -based Supramolecular Organic Frameworks for CO 2 adsorption. The research emphasizes the critical roles of recrystallization and activation processes in transforming P [5] A-OH into a porous structure conducive to efficient CO 2 uptake. The water vapour adsorption and adsorption cyclability for CO 2 under dry and humid conditions are reported for the first time for P [5] A-OH. The material exhibited a CO 2 adsorption capacity of 2.16 mmol g -1 at 298 K and 1 bar, with CO 2 /N 2 IAST selectivity of 72 and excellent structural and CO 2 adsorption cyclic stability under dry and humid conditions, highlighting its potential as a robust and cyclable adsorbent for CO 2 separation. • Adaptive Pillar [5] arene based Supramolecular organic framework • CO 2 /N 2 selectivity for flue gas. • CO 2 separation performance under humidity.