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Carbon dioxide (CO₂) mitigation is of prime importance due to its prodigious release into the atmosphere from power plants and other industrial sources which directly influence the climate change. Adsorption process is considered as an attractive process for CO₂ separation and purification due to low energy requirement, cost-effective and ease in applicability over wide range of operating conditions. In this work, mesoporous Si-MCM-41 was functionalized with different loadings of tetraethylenepentamine (TEPA) to study its performance for CO₂ adsorption using gravimetric technique. The adsorption data shows that incorporation of TEPA into Si-MCM-41 promotes CO₂ adsorption and the adsorption capacity increases with increasing loading of TEPA from 10 to 50 wt.%. The 50 wt.% TEPA-functionalized Si-MCM-41 shows the CO₂ adsorption capacity of 54.65 mg/g at 25 °C and 1 bar. Further studies shows that …