Adsorption of carbon dioxide on organically functionalized SBA-16

The adsorption of CO2 on SBA-16 functionalized with N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAPS) was investigated by DSC–TGA at 333 K. Hydrolysis of the calcined SBA-16 improved the adsorption performance. The functionalized samples prepared with hydrolyzed supports showed superior adsorption capacity and rate to those prepared with calcined supports. The adsorption capacity and rate increased with decrease in the particle size of samples. The samples with fine particle size exhibited good accessibility and high surface area for the grafting agent. The maximum adsorption capacity of CO2 at 333 K was 0.727 mmol g−1 for the functionalized SBA-16 (hydrolyzed SBA-16 as support) with the particle size range of 0.124–0.15 mm. The relationship between adsorption capacity and amine content is Y = 0.3855X−0.4397 where Y is adsorption capacity (mmol g−1) and X is amine content (mmol-N g−1).