Triptycene, Phenolic-OH, and Azo-Functionalized Porous Organic Polymers: Efficient and Selective CO₂ Capture

Abstract

The well-known azo coupling reaction was utilized to yield a new group of triptycene-derived azo polymers (TAPs) bearing phloroglucinol units. TAPs have hierarchical porosity (presence of micropores and mesopores) and are thermally stable. TAPs have moderate surface area (SABET up to 772 m2 g–1) but demonstrate rather high CO2 uptake (up to 150 mg g–1). Azo functional group is reportedly N2-phobic and hence porous organic polymers (POPs) with azo (−NN−) units show high CO2/N2 selectivity. TAPs register CO2/N2 selectivity (273 K) that is higher than most azo-POPs reported until date. This favorable property of TAPs is attributed to the simultaneous coexistence of triptycenes (aromatic and three-dimensional rigid with high internal free volume), phenolic-OH (polar and CO2-philic), and azo (CO2-philic and N2-phobic) functional groups in the polymeric framework.

Triptycene-Based and Amine-Linked Nanoporous Networks for Efficient CO2 Capture and Separation

“…These results evidently hint that the PSD of TBPALs may be tuned easily by changing the number of reactive sites in the monomers. The microporosity present in TBPALs is ascribed to the incorporation of the rigid 3D triptycene units in the polymer network (Chen et al, 2016;Roy et al, 2017;Bera et al, 2018bBera et al, , 2019Tan et al, 2018).…”

Adsorbents for Noxious Gas Sequestration: State of the Art

“…; Article no.JSRR.51792 activated carbon; [11][12][13][14][15][16][17][18] have and capture of process systems or these compounds, organic frameworks carbon (AC) and considered as promising and storage, due pore volume, stability, ease of low regeneration adsorbents can specific applications functionalization of the utilization becomes adsorption capacity review of the polymers, AC and considered. The therefore, was to adsorbents for and then proffer…”

“…Different polymers have been synthesized harmful gases sequestration at different conditions [72] and modification synthetic and post-synthetic functionalization have been reported for improved performance specific applications [15]. The agents functionalization are compounds the affinity of porous polymers noxious gas.…”

“…The agents functionalization are compounds the affinity of porous polymers noxious gas. [74], -N heterocycles [75], phenolic motifs [15] are utilized. The method of synthesis plays a key role in the structure of a polymer, which invariably affects the adsorption capacity.…”

“…Polymers have also shown excellent reusability [75] and low heat of adsorption [77]. The works of [11,15,18,69,73,[78][79][80][81][82][83][84][85] highlight the use of polymers for CO 2 , SO 2 , NH 3, and H 2 S sequestration.…”