Influence of moisture in CO2 sources on CO2 capture using TEPA based biochar

“In addition, the adsorption capacity of CBC-50-TEPA was tested using 10% H₂O (g) SFG [15% CO₂/75% N₂/10% H₂O (g)]. The results are shown in Figure 8. Remarkably, it reached 3.31 mmol g⁻¹, 0.49 mmol g⁻¹ higher than in the dry SFG, as shown in Figure 8a. TEPA efficiency increased from 8.05 to 9.4 mmol g⁻¹, as shown in Figure 8b, since the presence of H₂O (g) changed the reaction mechanism of the amine with CO₂. The reactions of the amino group with CO₂ in the dry SFG are shown in Equations (16)–(18). When one CO₂ molecule was consumed, two amino functional groups were also consumed [41,42]. In the 10% H₂O (g) SFG, the reactions of the amino group with CO₂ are shown in Equations (19) and (20) [42,43]. One CO₂ molecule was absorbed, and one amino functional group was expended. Therefore, H₂O (g) increased the adsorption efficiency of the amino-functional group and the adsorption capacity of CO₂.” https://doi.org/10.3390/atmos13040579

“Figure 8. (a) Breakthrough adsorption curves and (b) adsorption capacity of CBC-50-TEPA in different SFGs.”