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Comparison of experimental and predicted isotherms of 18β-glycyrrhetinic acid adsorption onto (A) SBA-15-AP, (B) SBA-15-MAP, (C) SBA-15-DMAP, and (D) SBA-15-AEAP mesoporous adsorbents. The best fitted isotherm models derived from linear analysis are presented. Isotherm models: F, Freundlich; D-A, Dubinin-Astakhov; D-R, Dubinin-Radushkevich; L, Langmuir; R-P, Redlich-Peterson.
