Batch adsorption experiments were performed in a set of Erlenmeyer
flasks (250 mL) each one containing 200 mL of different
initial concentrations of MB (20–100 mg L−1) together with 0.5 g
of adsorbents at a particle size of 200 m. A mechanical magnetic
stirrer was used at a desired temperature and pH. To reach equilibrium
a time contact equal to 180 min was fixed for all experiments