AbstractAmine functionalized mesoporous adsorbents were synthesized and evaluated for adsorption of CO2. In the present study the mesoporous silica surface was treated with a surfactant tetra-n-propyl ammonium hydroxide (TPAOH) with an aim to tailor the characteristics of mesoporous silica walls. The as synthesized adsorbents were tested for determining equilibrium adsorption capacity using 100% CO2 and diluted 15% CO2 stream at different temperatures (30, 55, and 75°C). Equilibrium CO2 adsorption capacity of TEPA modified surface-treated silica was 2.51 and 2.54 mmol/g at 75°C under 15 and 100% CO2 concentration respectively. The as-synthesized adsorbents were also tested for determining dynamic adsorption capacity using 100% CO2 and diluted (15, 50, and 75%) CO2 stream at different temperatures (30, 55, and 75°C). Dynamic CO2 adsorption capacity of TEPA modified silica was 1.67 and 4.29 mmol/g at 75°C under 15 and 100% CO2 concentration respectively. This signifies the role of surfactant treatment aff...