Influence of ultra-micropore volume of activated carbons prepared from noble mung bean on the adsorption properties of CO₂, CH₄, and N₂

Abstract

In this study, mung bean-based nanoporous activated carbons with different pore properties were prepared by varying the mass ratio of activating agent (KOH) and activation temperature. The low-temperature nitrogen adsorption...

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“…These calculated values were similar to or comparable to those reported in the literature. 28 Our findings suggest that the prepared activated balsa has promising potential for use in adsorption-based gas separation processes.…”

“…Notably, the Sips equation exhibited the best fitting results for the experimental data, as evidenced by the ARE values below 2.80%. This finding is consistent with our previous reports, which also reported the Sips equation to be highly effective in accurately describing the adsorption behavior in similar systems. The isotherm parameters ( n s ) deviated from unity, indicating the presence of an energetically heterogeneous surface on the activated balsa.…”

“…The selectivity values calculated at a bulk pressure of 101.3 kPa under the flue, landfill (biogas), and coal bed gas conditions were approximately 29.6 (CO 2 /N 2 = 20/80), 9.1 (CO 2 /CH 4 = 50/50), and 3.0 (CH 4 /N 2 = 50/50), respectively. These calculated values were similar to or comparable to those reported in the literature . Our findings suggest that the prepared activated balsa has promising potential for use in adsorption-based gas separation processes.…”

“…Thus, in this study, IAST selectivity was chosen as the analysis method because of its widely recognized accuracy in predicting gas mixture systems. 28 The Sips isotherm model, which provided the best fitting results for the pure-component isotherm data, was utilized in conjunction with IAST to calculate the adsorption selectivity for different energy-related binary gas mixtures, including flue gas (CO 2 / N 2 ), landfill (or biogas) gas (CO 2 /CH 4 ), and coal bed gas (CH 4 /N 2 ), under various mole fractions and pressure conditions. The IAST adsorption selectivities calculated for different mole fractions at a total bulk pressure of 101.3 kPa are compared in Figure 5f.…”

“…To assess the selectivity of the binary mixtures (CO 2 /N 2 , CO 2 /CH 2 , and CH 4 /H 2 ), the ideal adsorbed solution theory (IAST) was employed based on the parameters obtained from the Sips adsorption isotherm for each pure component. , The IAST adsorption selectivity of binary gas mixtures can be expressed as follows: where x and y are the molar fractions of the components in the adsorbed and gaseous phases, respectively.…”