|Preparation of activated carbon from Garcinia Mangostana Shell for adsorption of cadmium ion from aqueous solution
Kang Yee Li, Azrina Abd Aziz, Shaliza Ibrahim, Pichiah Saravanan*
Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
Heavy metals mainly cadmium, nickel, zinc, mercury, etc is represent a group of inorganics frequently found in electroplating, electronics industrial effluents and reported in hazardous waste sites. Because of their toxicity to human and marine life, increasingly stringent regulations have been imposed for limiting the concentrations of these compounds in wastewater before discharge. Hence, the efficient removal of these compounds from industrial effluents is of great practical significance for environmental protection. Conventionally, treatment methods like flocculation, coagulation, chemical oxidation, adsorption on granular activated carbon, etc are commonly used for removing it from wastewater. Among these, adsorption is one cost-effective and user friendly technique for its removal. In recent years several investigations have been reported using industrial or agricultural wastes as adsorbents and the data shown that those waste exhibit more or less adsorption capacity. For instance agricultural wastes like straw, coconut shell, cashew nut shell and citrus fruit peel were utilized as raw materials in preparing the activated carbon.
In this work an adsorbent prepared from Garcinia Mangostana shell by physical activation. The prepared activated carbon was characterized using FTIR, XRD, SEM, EDAX and BET analysis. The adsorption capacities of activated carbon were investigated by varying initial cadmium (Cd) ion concentration, adsorbent dosage, pH, equilibrium time and temperature to assess the kinetic and equilibrium parameters. In addition, the thermodynamic parameters, standard free energy (G), standard enthalpy (H), standard entropy (S) of the adsorption process were calculated for activated carbon. The complete results of which will be reported in its extended abstract.