https://doi.org/10.2478/pjct-2021-0001
“Figure 2. shows the pore size distribution determined from CO2 adsorption isotherms at 0oC (PSDCO2), and Figure 3. reveals the results of PSD calculated from N2 adsorption isotherms at –196oC (PSDN2). Both PSDs were calculated by the DFT method. To clarity the graph, the maximum value of the horizontal axis is 20 nm, for the reason that the obtained materials did not contain a high number of larger pores. All the samples exhibited contents of pores with a diameter range of 0.3–20 nm. The largest volume was occupied by pores with diameters ranging from 0.4 to 0.8 nm and 1.3 to 2.7 nm, which confirms the development of microporosity and the presence of smaller mesopores in obtained materials. The carbon dioxide adsorption isotherms of the ex-amined samples are presented in Figure 4 (at 0oC) and Figure 5 (at 25oC). The CO2 uptake at 1 bar and 0oC is in the range of 1.18 to 1.49 mmol/g, while for pristine sepiolite is 0.27 mmol/g. In the case of CO2 uptake at 1 bar and 25oC is between 0.63 and 0.89 mmol/g for sepiolite-based materials and 0.18 mmol/g for pristine sepiolite. The highest value of CO2 capacity at 0oC and 25oC, 1.49 mmol/g, and 0.89 mmol/g was confi rmed for MSEP2 material. ”
