*3.6. Textural Parameters and CO2 Sorption Capacity Analysis*

The specific surface areas (SBET) were calculated from the Brunauer–Emmett–Teller equation, based on the nitrogen adsorption isotherms measured at 77 K using QUADRA-SORB evoTM Gas Sorption analyzer (Anton Paar GmbH, Austria) in the relative pressure range of 0.05–0.2. Before the measurements, the materials were degassed for 12 h at 105 ◦C under the high vacuum. The total pore volume (Vtotal) was determined on the basis of the maximum adsorption of nitrogen vapor at p/p0 = 0.95. Micropore volume (Vmicro) was calculated using the Dubinin-Radushkevich method, while the mesopore volume (Vmeso) was obtained from the difference between Vtotal and Vmicro.

Adsorption of the carbon dioxide was performed at 0 ◦C and 25 ◦C using the same QuadrasorbTM automatic system (Quantachrome Instruments) in the pressure range between 0.01 and 0.98 bar.

Adsorption of the carbon dioxide was also measured at 30 ◦C with the use of the TGA method (Netzsch STA 449 C, Netzsch GmbH, Germany). The flow rate of carbon dioxide during the analysis was 30 cm3/min. The process of adsorption of CO2 by the tested material lasted 120 min.
