keywords: Langmuir isotherm, chemisorption, sawdust, heavymetals
The equilibrium and kinetics of adsorption of Cr(VI) and Pb(II) ions from the binary solution onto sawdust was investigated. The batch adsorption techniques were employed in the studies. The effect of pH, contact time and initial concentration were investigated. The optimum pH for adsorption of Cr(VI) and Pb(II) ion were 4 and 5 respectively. The experimental data best fit to the Langmui rwith a correlation coefficient of 1. The adsorption capacity of the sawdust for Cr(VI) and Pb(II) ions were 0.92 and 0.89 mgg-1 respectively. The energy of adsorption obtained from the Dubinin Raduskevich model shows that chemisorption was dominant. The adsorption process follows a pseudo second order model, with a correlation coefficient of 1 for both metal ions.
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