The objective of this research were to study the cadmium removal efficiency from synthetic wastewater on cadmium contaminated by iron wood charcoal and iron wood charcoal with activated carbon using sodium chloride. The physical characteristics, optimum factors of cadmium removal and freundlich adsorption isotherm were observed. The physical characteristics results, surface area of iron wood charcoal id 256.57 m²/g. Preparing activated carbon, the optimum condition at 400 ℃ with ratio by weight of charcoal to sodium chloride 1:1, surface area 167.33 m²/g and average pore diameter are 7659.88 and 1722.12 Å respectively. Consider the best optimum pH to removal efficiency in synthetic wastewater were pH 4 for two charcoals, removal efficiency of iron wood charcoal 29.077% and prepared activated carbon 20.172%. The experiment results of isotherm adsorption to cadmium in synthetic wastewater related to freundlich equation. The maximum cadmium removal efficiency of iron wood charcoal and prepared activated carbon were 4.9075 and 3.0940 mg/g respectively. In this experiment results shown the cadmium removal efficiency in synthetic wastewater of iron wood charcoal were better than activated carbon preparing from iron wood charcoal with activated using sodium chloride.
