Fabrication of azobenzene-functionalized porous polymers for selective CO2 capture |
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Authors: | Ding-Ming Xue Wen-Juan Zhang Xiao-Qin Liu Shi-Chao Qi Lin-Bing Sun |
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Affiliation: | State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China |
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Abstract: | Many solid adsorbents have been prepared for the CO2 capture. In particular, the photoresponsive adsorbents have attracted extensive interests because of their tunable pore structure and variable responsive behaviors provoked by the external light. However, it is challenging to fabricate the photoresponsive adsorbents featured the big CO2 capacity and high CO2 selectivity. Herein, copolymerized between 4-phenylazobenzoyl chloride, 2,4,6-trichloro-1,3,5-triazine and melamine, a series of azobenzene-functionalized porous polymers (PTM-AZOs) are successfully synthesized. The PTM-AZOs are verified in possession of proper pore structures, large surface area and photoconductive properties through a series of characterization. The PTM-AZO-2 with the trans-isomerization exhibits the best CO2 adsorption amount of 2.7 mmol·g-1 (273 K and 0.1 MPa), while the CO2/N2 selectivity can reach 2459 and 607 on the trans- and cis-isomerization, respectively. The regulatable pore structures controlled by the photoresponsive azobenzene groups affect the CO2 capture performance of the PTM-AZOs. |
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Keywords: | Adsorption CO2 capture" target="_blank">2 capture')">CO2 capture Selectivity Azobenzene Photoresponse |
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