Key words: chitosan, lignosulfonate, alginate, aerogel, textural characteristics, supercritical fluid technologies, organic and carbon-native aerogels
Based on two—component hydrogels sodium alginate—chitosan (ALNa—HT) and sodium lignosulfonate—chitosan (LSNa-HT) with the use of supercritical fluid technologies and carbonation, organic and carbon aerogels were obtained. The effect of the solvent-acetone replacement regime in hydrogels on the textural properties of aerogels based on them has been studied. It is shown that the dynamic mode of solvent replacement in two-component hydrogels can reduce the duration of the process by six times and significantly reduce the consumption of acetone compared to the solvent replacement in static mode, as well as preserve the developed porous structure of the material. The specific surface area of organic ALNa-HT and LSNa-HT aerogels is 100 and 260 m2/g, and the carbon aerogels obtained from them are 438 and 868 m2/g, respectively. Scanning electron and atomic force microscopy methods have established that the supramolecular structure of synthesized organic and carbon aerogel nanomaterials is a cluster.
doi:10.34984/SCFTP.2022.17.3.005