REMOVAL OF CADMIUM BY WOOD CHARCOAL

Wood charcoal was used to remove Cd from acidic waste water. The adsor ption of Cd depends on various adsorption parameters such as pH, tempe rature, metal ion concentration and amount of adsorbent. Adsorption ki netics were fast initially followed by slower kinetics and attained a stationery phase within one hour. The activation energy was found to b e 64.844 kJ/mole. From the enthalpy change the adsorption reaction was found to be endothermic. Various other thermodynamic parameters such as free energy change and entropy change were also calculated.