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ABSTRACT
Maize husk, an abundant Agricultural waste, was used to prepare a biosorbent for the biosoption of Mn(II) and Pb (II) ions from aqueous solution in a batch process. Equilibrium and Kinetics of biosorption of the metals ions were studied at 25oC. The adsorbtion data were treated with common kinetic and isotherm models. In this study, the correlation co-efficient (R2 = 0.88-0.99), it can be concluded that the experimental equilibrium data can be adequately described by Freundlich, an indication that the adsorption behavior is a multilayer adsorption. In addition, the adsorption efficiency of Pb(4.92) is remarkable lower than that of Mn (5.48). This trend may be explained by the fact that two metal ions are dependent on their hydration energies. Mn(II) with ionic radius 0.83A) has hydration energy of -350 KTmol-1 . Metal ion with smaller ionic radius and lower hydration energy are more likely the adsorbed than metal ion with higher ionic radius and hydration energy. After modification of adsorbent surface, the Mn ion adsorption with value of 4.76 was not favorably disposed compared to Pb ion adsorption with value of 6.83. The study also revealed that the sorption process in both cases depend on biomass dosage, temperature, pH and initial meal ion concentration. The calculated thermodynamic parameters (G, H, and S) showed that the biosorption of the metal ions onto maize husk is feasible, spontaneous and exothermic in nature.
