2.3. Equilibrium studies
Adsorption experiments were carried out by adding a fixed
amount of sorbent (0.60 g) into a number of 250 mL-stoppered glass
Erlenmeyers flasks containing a definite volume (0.20 L in each
case) of different initial concentrations (35–400 mg/L) of dye solution
without changing pH and temperature 30 ◦C.