Abstract
Adsorption of Zn (II) ions from aqueous solutions was studied in a batch system using Tiger nut shells. The optimum condition for the adsorption of Zn (II) ions from aqueous solution by these shells was investigated by considering the extent of adsorption with respect to contact time, initial metal ion concentration, particle size of the adsorbent and modification of the adsorbent with H2SO4. The extent of metal ions removed decreased with increasing contact time but increased with increase in the initial metal ion concentration. The adsorption equilibrium data were best described by Langmuir adsorption isotherm. Although intraparticle diffusion was not the rate determining step for the adsorption of Zn (II) ions from aqueous solution by tiger nut shell, the adsorption kinetic was consistent with Weber-Morris and Lagergren pseudo second order models. Key words: Adsorption, Zn (II), tiger nut shell, kinetics.
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