In this study, we explored the development of materials with enhanced CO2 adsorption capabilities, focusing on a range of hierarchical LTA zeolites distinguished by their diverse mesopore architectures enhanced with alkylamines. Notably, the most promising CO2 uptake performance was achieved through the application of (3-aminopropyl) trimethoxysilane (APTMS) onto the hierarchical LTA zeolite with mesopores. By harnessing both the amine groups anchored to the mesopore surfaces and the active sites within the LTA zeolites, these materials exhibited significantly improved CO2 adsorption compared to conventional amine appended mesoporous silica’s such as MCM-41. Furthermore, our adsorbent displayed commendable CO2 uptake capacity, underscoring its potential for practical application
