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Carbon Capture and Storage (CCS) uses a combination of technologies to capture, transport and store carbon dioxide (CO₂) emissions from large point sources such as coal or natural gas-fired power plants. Capturing CO₂ from ambient air has been considered as a carbon-negative technology to mitigate anthropogenic CO₂ emissions in the air. The performance of a mesoporous silica-supported polyethyleneimine (PEI)–silica adsorbent for CO₂ capture from ambient air has been evaluated in a laboratory-scale Bubbling Fluidized Bed (BFB) reactor. The air capture tests lasted for between 4 and 14 days using 1 kg of the PEI–silica adsorbent in the BFB reactor. Despite the low CO₂ concentration in ambient air, nearly 100% CO₂ capture efficiency has been achieved with a relatively short gas–solid contact time of 7.5 s. The equilibrium CO₂ adsorption capacity for air capture was found to be as high as 7.3 wt …