Adsorption experiments were carried out by adding a fixed amount of sorbent (50mg) into 100 mL
beaker containing 50 mL of different initial concentrations (5 100 mg/L) of dye solution. The temperature
was controlled at 20±2 °C. Agitation was provided at 600 rpm for 3 h. The initial and equilibrium dye
concentrations were determined by absorbance measurement using double beam UV Vis
spectrophotometer (Shimadzu, Model UV 160A) at 664.5nm. It was then computed to dye concentration
using standard calibration curve. The amount of adsorption at equilibrium, qe (mg/g), was calculated by: