| Summary: | A porous azo-functionalized organic polymer (JJU-2) was designed and prepared via oxidative coupling polymerization promoted by FeCl<sub>3</sub>. JJU-2 exhibited reversibly stimuli-responsive CO<sub>2</sub> adsorption properties as a result of the trans/cis isomerization of the polymer’s azo-functionalized skeleton. Under UV irradiation and heat treatment, this porous material displayed various porous structures and CO<sub>2</sub> adsorption properties. The initial Brunauer-Emmett-Teller (BET) surface area of JJU-1 is 888 m<sup>2</sup> g<sup>−1</sup>. After UV irradiation, the BET surface area decreases to 864 m<sup>2</sup> g<sup>−1</sup>, along with the decrease of micropores around 0.50 nm and 1.27 nm during the trans-to-cis isomerization process. In addition, CO<sub>2</sub> sorption isotherms demonstrate an 8%t decrease, and the calculated Qst of CO<sub>2</sub> has decreased from 29.0 kJ mol<sup>−1</sup> to 26.5 kJ mol<sup>−1</sup> due to the trans to cis conversion of the azobenzene side group. It is noteworthy that JJU-2′s CO<sub>2</sub> uptakes are nearly constant over three cycles of alternating external stimuli. Therefore, this azo-functionalized porous material was a potential carbon capture material that was responsive to stimuli.
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