Research Article

Optimizing the Extraction Conditions of Hydroxytyrosol from Olive Leaves Using a Modified Spherical Activated Carbon: A New Experimental Design

Figure 1

Langmuir (a) and Freundlich (b) isotherm adsorption models at 10, 20, and 30°C. qe = adsorption capacity; Ce = equilibrium HT concentration.
(a)
(b)