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Xinfu Zhao,Yihao Nie,Xibin Yi,Shimo Yu,Jing Zhang,Xiaochan Liu,Zhipeng Yuan,Sijia Liu,Jian Zhang,Guoliang Dou,Mengdi Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
Design of efficient CO2 adsorbent is an effective way to capture CO2. Bamboo-derived activated carbon isa promising CO2 adsorbent. Inspired by this, carbonized unidirectional polyimide (CUPI) aerogels werenewly designed by the ice templating method using directional freezing technology. The pore propertyof CUPI aerogel can be tuned by changing the solidification velocity, and a series of CUPI aerogels weredesigned to explore the CO2 capture performance in view of pore morphology/topology. As a result,the obtained CUPI-8 exhibits higher CO2 adsorption capacity compared to carbonized polyimide aerogelsdue to the synergistic effect of micropores and lamellar pores. Specially, the CO2 adsorption capacity overCUPI-8 can be up to 5.75 mmol/g at 20 bar and 298 K. Furthermore, the adsorption isotherm of CUPI-8still shows an upward trend even nearly 20 bar. The isosteric adsorption heat (Qst) value of CUPI-8 isnearly in the ideal scope of 30–50 kJ mol1. The efficient CO2 adsorption performance and good chemicalstability of CUPI aerogel makes it a promising absorbent for practical application. This work provides anew opportunity for researching the effect of pore morphology/topology and the synergistic effect ofhierarchical pores on CO2 capture.