Abstract
Silica aerogels are promising CO2 adsorbents, but they still suffer from serious limitations including high cost and low CO2 adsorption capacity. According to the knowledge of micropores promoting faster and more uptake of CO2, amine in-situ hybrid SiO2 aerogels (AIHSAs) with hierarchically porous structure were prepared. Due to the steric hindrance effect of long organic chain from bis[3-(triethoxysilyl)propyl]amine as silicon precursor, the micropores were constructed. The obtained AIHSAs possess the high content of amine groups, high specific surface area (as high as 579.63 m2/g) and high pore volume. Therefore, a fascinating CO2 capture ability up to 6.57 mmol/g at 273 K was achieved, which is significantly higher than the values of other silica-based aerogels. The as-prepared AIHSAs have great application prospects in the field of CO2 capture to promote carbon neutrality.
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