Carbon dioxide capture using biochar produced from sugarcane bagasse and hickory wood

Biochars as Potential Adsorbers of CH4, CO2 and H2S

“…A recent study using sugarcane bagasse biochar showed that it is a promising CO 2 -adsorbing material with capacity of about 70 mg/g [14]. However, the current study shows a much lower capacity (16 mg/g).…”

“…The decrease in the adsorption capacity could be due to competition for the sorption sites between CO 2 and H 2 S and the starting material used to produce the biochars. This study measurement was taken during simultaneous exposure to both CO 2 and H 2 S, whereas the report by Creamer et al [14] was conducted using only CO 2 . In order to prove the competition, a single-gas adsorption study for CO 2 , CH 4 , and H 2 S was performed.…”

“…The patterns of biochars for CO 2 adsorption capacity were similar to H 2 S, but the adsorption capacity was much lower (Table 2); the breakthrough curve for CO 2 in Figure 3 was very steep. Creamer et al [14] suggested that the adsorption of CO 2 onto biochar was mainly controlled by physisorption, which is a weak interaction raised from intermolecular forces (e.g., van der Waals forces).…”

“…The CO 2 adsorption capacities of biochars were positively correlated with the N contents of the biochars (R 2 = 0.871), suggesting their interdependence and the importance of N groups for CO 2 sorption. The strong interaction between the acidic CO 2 and the basic nitrogenous functional groups of biochars may promote the physisorption of CO 2 on biochar surfaces [14].…”

“…In comparison with an activated carbon, the manufacturing of biochar requires less energy and no pre-or post-activation processes, although it has a high adsorption ability and capacity [13]. Biochar is also the well-known means of carbon sequestration [14]. Thus, the objective of this work is to evaluate the potential of biochars derived from different types of biomass to eliminate H 2 S and CO 2 from biogas.…”