Adsorption experiments were carried out using pot ale after pH adjustment and filtration. The pH of the initial wastewater was adjusted to values of 5.0 and 7.0. The adsorption experiments were conducted in 500 mL glass bottles with 50 mL of
filtered sample in each, to which various concentration of chitosan were added. A control experiment was also run with no chitosan added. The bottles were agitated in an orbital shaker running at 200 rpm at a temperature of 20 C for 18–20 h to ensure that equilibrium had been achieved.