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Freundlich (a) and Langmuir (b) isotherm curve for polyphenols adsorption, at equilibrium, 373 for the Purosorb™PAD428 resin. The y-axis reports: for the Freundlich curve, the equilibrium adsorption capacity "qe” (qe = x/m, in which x = mass of adsorbate and m = mass of adsorbent); for the Langmuir curve, the "Ce/qe" ratio (in which Ce is the solute concentration at the equilibrium).
