| Summary: | An efficient CO<sub>2</sub> adsorbent with a hierarchically micro-mesoporous structure and a large number of amine groups was fabricated by a two-step synthesis technique. Its structural properties, surface groups, thermal stability and CO<sub>2</sub> adsorption performance were fully investigated. The analysis results show that the prepared CO<sub>2</sub> adsorbent has a specific hierarchically micro-mesoporous structure and highly uniformly dispersed amine groups that are favorable for the adsorption of CO<sub>2</sub>. At the same time, the CO<sub>2</sub> adsorption capacity of the prepared adsorbent can reach a maximum of 3.32 mmol-CO<sub>2</sub>/g-adsorbent in the actual flue gas temperature range of 303–343 K. In addition, the kinetic analysis results indicate that both the adsorption process and the desorption process have rapid adsorption/desorption rates. Finally, the fitting of the CO<sub>2</sub> adsorption/desorption experimental data by Avrami’s fractional kinetic model shows that the CO<sub>2</sub> adsorption rate is mainly controlled by the intra-particle diffusion rate, and the temperature has little effect on the adsorption rate.
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