In the present study the adsorption of manganese ions from aqueous solution with natural adsorbents such as Moringa oleifera leaf, Borassus flabellifer and Mangifera indica is experimentally investigated. The experiments were conducted to evaluate the effect of various experimental parameters such as effect of pH, adsorbent dosage and contact time on the removal efficiency. The results showed that optimum conditions for manganese removal were found to be pH of 6, adsorbent dosages of 0.2 g/l and equilibrium contact time of 120 min. The kinetic of adsorption system have been studied based on the assumption of pseudo-first, pseudo-second order reaction. The Experimental results have been analyzed using a Langmuir and Freundlich adsorption isotherm models. The Freundlich adsorption isotherm model was found to represent the equilibrium adsorption isotherm better than Langmuir adsorption isotherm. Surface morphology structure of before and after adsorbed activated carbons were recorded by using SEM analysis. Surface morphology structure various adsorbents were changed after adsorption of manganese metal ion. FT-IR spectra binding sites were recorded before and after adsorption. The spectral was measured within the range 400-4000 cm. The spectral frequencies were shifted to different wave number. This is a evident that manganese metal ion adsorbed into adsorbents.
