fig4

Figure 4. Sorption isotherms for CH₄, CO₂, C₂H₆, and C₃H₈ of ADPB-COF at (A) 298 K and (B) 273 K; (C) Calculated isosteric heats of CH₄, CO₂, C₂H₆, and C₃H₈ on ADPB-COF and (D) IAST calculations for adsorption selectivity of equimolar CO₂/CH₄, C₂H₆/CH₄, and C₃H₈/CH₄ gas mixtures on ADPB-COF at 298 K. ADPB: (4'-amino-5'-(4-(2,2-dioxan-1,3-dioxan-5-yl)phenyl)-[1,1':3',1'-teroxan]-5-yl) boronic acid; COF: covalent organic framework; IAST: ideal adsorption solution theory.