Increasing the surface area and CO2 uptake of conjugated microporous polymers via a post-knitting method?

Materials Chemistry Frontiers Pub Date: 2021-05-19 DOI: 10.1039/D1QM00371B

Abstract

The synthesis of high-surface-area porous organic polymers (POPs) for CO2 capture and storage (CCS) has received significant attention from researchers. However, the construction of POPs with a large surface area still remains challenging in synthetic chemistry, because of the complex formation process of the porous skeletons. Herein, we developed a facile post-knitting method to increase the surface area of conjugated microporous polymers (CMPs) to improve the CO2 adsorption capacity. Four CMPs were knitted using two different cross-linkers via a Friedel–Crafts reaction to obtain eight CMP-based hyper-crosslinked polymers (KCMPs), respectively. These resulting KCMPs exhibit a high Brunauer–Emmett–Teller (BET) surface area and total pore volume up to 2267 m2 g?1 and 3.27 cm3 g?1, which are 2.3 times and 8.8 times higher than the corresponding CMPs, respectively. In addition, these KCMPs show obvious increases in the CO2 uptake with the best-performing KCMP-M4 of 3.98 mmol g?1 (89.2 cm3 g?1) at 1 bar and 273 K, an increase of 122.2% compared to the pristine CMP-4. This post-knitting method can provide more potential porous adsorbents for CCS technologies and could be used to further develop novel methods for the synthesis of high-surface-area POPs.

Graphical abstract: Increasing the surface area and CO2 uptake of conjugated microporous polymers via a post-knitting method
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