Siberian Federal University

New methods for the synthesis of organic and carbon composites based on chitosan and aerogel from birch pulp are proposed. The obtained chitosan-cellulose composites have a spongy structure (the size of the cavities is from 50 to 70 microns), a low density (0.041–0.046 g/cm3) and a poorly developed meso-macroporous structure. The effect of additives of modifying agents (tannins of larch bark and Cu(Ac) on the porous structure and thermochemical properties of biocomposites has been established. The introduction of tannins reduces the average pore size and increases the specific surface area of the biocomposite. Carbon composites were obtained by carbonation of chitosan-cellulose biocomposites at a temperature of 600 °C. The resulting carbon composites have a poorly developed porous structure, and the addition of tannins increases the specific surface area of carbon composites from 1 m2/g to 7 m2/g and helps reduce the size of mesopores to 10.7–12.4 nm. The porous structure of carbon composites was developed by their thermal alkaline activation with NaOH at 800 °C. The surface of carbon composites increases by 2–3 orders of magnitude after activation and reaches 1160 m2/g for a sample containing an additive of tannins. The sample doped with copper acetate has the lower specific surface area (588 m2/g). Activated carbon composites are micro-mesoporous materials. The ratio of micropores and mesopores in them varies depending on the chemical composition of the initial biocomposite. The properties of the obtained carbon composites based on chitosan and cellulose, such as high specific surface area, adjustable porous structure, low density, and the possibility of chemical modification, open up prospects for their use as catalysts, catalyst carriers, adsorbents