Metal Ions Modified Azo-Linked Porous Polymers for High Performance CO2 Capture

Graphical Metal ions modified azo-linked porous polymers for CO 2 capture through coordination adsorption with high adsorption capacity and excellent cycling stability. Herein, a novel CO 2 adsorption materials (ALP−M) with controllable adsorption heat were prepared by loading metal ions on azo-linked porous polymer through coordination interaction. The as-prepared ALP−M showed excellent CO 2 capture performance with a column adsorption capacity 4.99 mmol g −1 at 273 K (1 bar) and 98 % capacity retention rate after 500 adsorption and desorption cycles. Porous polymer show great potential for CO 2 capture owing to its high specific surface area, adjustable porous structure and chemical structure. Herein, a novel CO 2 adsorption materials ALP−M (M: Cu 2+ , Mg 2+ , Ni 2+ ) were prepared through coordination between azo-linked porous polymer (ALP) synthesized by oxidative coupling polymerization of tris(4-aminophenyl)amine and metal ions. The structures and morphology of as-prepared materials were demonstrated by FT-IR, XRD, XPS, BET and SEM, the CO 2 capture performance and mechanism of ALP−M were also investigated through static adsorption and column adsorption experments, the results show that metal ions can enhance the CO 2 adsorption and desorption performance of ALPs by coordination adsorption. ALP−M showed a highest static CO 2 adsorption capacity of 2.67 mmol g −1 at 273 K (1 bar), which is 35.5 % higher than that of ALP. The metal ions served as Lewis acid sites can enhance the affinity of adsorbent for CO 2 . In column adsorption experiments, the ALP−M showed a higher saturated adsorption capacity 4.99 mmol g −1 at 273 K (1 bar) than that of static adsorption, and excellent cycling stability after 500 adsorption and desorption cycles, the adsorption capacity retention rate of ALP−M for CO 2 can reach 98 %.