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.