in which qe is the amount of methyl red adsorbed at equilibrium per unit
weight of sorbent (mg/g), Co and Ct (mg/L) are the dye concentrations in the solution
before and after adsorption, V is the solution volume (in liter (L)), and m is the
amount of sorbent (in gram (g)) used in the adsorption experiment.
The dye percent removal (%) was calculated using the following equation: