Abstract:
Heavy metals can cause serious environmental problem such as the detereatom of water
quality and natural resources, therefore there should be a way to reduce them. The effect of heavy metals on environment requires immedate solution, thus minimizing the adverse effect that may arise. The adsorption method in this study, the synthetic birnessites have been applied to reduce the Cu2+ ion concentration from the synthetic solution. To optimize the adsorption, processes of several parameter adsorptions, such contact time, concentration of solution have been investigated using batch method. The
concentration of Cu2+ ions adsorped in the birnessite was monitored by atomic
adsorption spectroscopy (AAS). The result showed that the optimum conditions for
birnessite adsorption for Cu2+ ions are 10 minute for contact time, concentration 8,0913
mg/L with adsorption percentages 98%, at 600C and pH 6. The process of adsorption
Cu2+ ions on birnessite follows the Freundlich isotherm types. The adsorption is
physical adsorption (physichsorps) characterized with the value of ΔH positive that is 18,053 kJ/mol and ∆S of 74,2606 J/molK. The ΔH positive value indicated that the reaction is endothermic with ΔG negative (-4,448 kJ/mol), so if can be concluded the
reaction is spontaneous
