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. 2019 Nov 7;12(22):3671. doi: 10.3390/ma12223671

Figure 15.

Figure 15

Surface area-normalized maximum adsorption capacity of (A) modified SBA-15 silicas and (B) modified Aerosil® siliacas towards 18β-glycyrrhetinic acid. The parameter calculated from maximum adsorption capacity estimated from nonlinear fitting analysis. Isotherms: D-A, Dubinin-Astakhov; D-R, Dubinin-Radushkevich; L, Langmuir.