PRODUCTION OF SILICON-RESORCINOL-FORMALDEHYDE AEROGELS AND INVESTIGATION OF THEIR CO2 ADSORPTION CAPACITY
In the work samples of silica-resorcinol-formaldehyde aerogels with different ratios of used silanes were obtained. Differences in the chemical structure of the obtained samples are shown by IR-spectroscopy. The decrease in the proportion of tetraethoxysilane and the increase in the proportion of aminoethylaminopropyltrimethoxysilane in the reaction mixture cause a decrease in the texture parameters of the resulting silicon-organic aerogels. Adsorption of CO2 was investigated at 273 K using a Nova 3200e (Quantachrome) device. It was found that samples M4-1, M4-2, M4-3, M4-4, M4-5 have similar CO2 sorption capacity values: 21.2, 19.2, 17.0, 17.7 and 19.6 cm3/g, respectively. An increase in the content of aminoethylaminopropyltrimethoxysilane in the reaction mixture leads to an increase in the concentration of amino groups on the inner surface of the aerogel and, as a result, to an increase in the chemisorption effect, which is appeared in an increase in the distance between the adsorption and desorption branches of the isotherms.