Recent advances in amine-functionalized silica adsorbents for CO2 capture

Carbon capture, utilization and storage is one of the key technologies to achieve carbon neutrality. Carbon capture is an important step in this, so it is necessary to develop efficient CO2 capture technologies. Among all kinds of CO2 adsorbents, amine-functionalized silica materials as low temperature CO2 adsorbents have been widely studied, and great progress has been made in material design, modification and application in recent years. This work reviews the recent progress of amine-functionalized silica CO2 adsorbents in the past five years, including their synthesis methods, factors affecting their performance, and adsorption mechanism. The practical applications of amine-functionalized silica adsorbents, such as post-combustion CO2 capture, direct air capture, CO2 separation from natural gas, and CO2 separation in confined spaces are introduced. Meanwhile, the problems existing in the application of these materials are summarized, and the corresponding suggestions are put forward. In addition, the stability of amine-functionalized silica adsorbents in practical application is discussed in a separate section. Finally, the future development of these materials is prospected. To conclude, this review has important implications for further optimization of the design and application conditions of amine-functionalized silica adsorbents, and is of great significance for understanding its current situation and development trend. [Display omitted] •The latest amine-functionalized silica CO2 adsorbents have been reviewed.•The factors affecting CO2 adsorption performance are summarized.•The adsorption mechanism and the stability of the adsorbents were discussed.•The application of the adsorbents in CO2 capture was discussed.•Challenges in future study and applications are suggested.