Facile synthesis of an amine hybrid aerogel with high adsorption efficiency and regenerability for air capture via a solvothermal-assisted sol–gel process and supercritical drying

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Abstract
An amine hybrid resorcinol–formaldehyde/silica composite aerogel (AH-RFSA) was developed for the first time through a solvothermal-assisted sol–gel process combined with supercritical drying (SCD). The CO2 adsorption performances of AH-RFSA in air were investigated. The results reveal that the solvothermal temperature negatively affects the CO2 adsorption capacity of AH-RFSA. Water favors the CO2 adsorption capacities, especially the useful CO2 adsorption capacity. The total CO2 adsorption capacity achieved with the new adsorbent at 25 °C in dry and humid air is 1.80 and 2.57 mmol g−1, respectively. The useful CO2 adsorption capacity of AH-RFSA in humid air is as high as 1.85 mmol g−1. The adsorbent preparation method is inspiring and the resulting adsorbent is exceptional in capacity and regenerability.

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