The kinetics of sorption and intraparticulate diffusivities of Zn, Cd and Pb using maize cob was studied. The amount of the metal ions adsorbed increased with time. The highest sorption rates of the three metal ions were 71% for Z 2+ , 32% for Cd 2+ , and 30% for Pb 2+ . The fractional attainment of equilibrium showed that Zn 2+ reached equilibrium before Pb 2+ ion and then Cd 2+ ion. This study showed that the sorption of Zn 2+ , Cd 2+ and Pb 2+ ions on maize cob is particle diffusion controlled. The rate coefficients for particle diffusion were 0.07 min -1 for Zn 2+ , 0.053min -1 for Pb 2+ and 0.081min -1 for Cd 2+ . African Journal of Biotechnology Vol. 4 (6), pp. 509-512, 2005
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Abia et al. (2005) studied this question.