Kinetic, thermodynamic and isothermal parameters of biosorption of Cr (VI) and Pb (II) ions from aqueous solution by biosorbent prepared from corncob biomass
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Date
2012
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Abstract
The kinetics, equilibrium and thermodynamic of the biosorption of Cr (VI)
and Pb (II) ions onto corncob from aqueous solution were investigated.
Optimum experimental parameters were determined to be pH 5.8 for Pb (II)
and pH 2.0 for Cr (VI), contact time of 80 min, and temperature 25 C. The
maximum biosorption capacity of the biomass was found to be 8.07 mg g-1
for Cr (VI) and 9.05 mg g-1 for Pb (II). Upon treatment with oxalic acid, the
values of maximum biosorption capacity for Cr (VI) and Pb (II) were found
to be 10.74 and 10.27 mg g-1 respectively. The kinetic studies showed that
the biosorption process of the metal ions fitted well with second order
model. The calculated thermodynamic parameters (G, H and S)
showed that the biosorption of Cr (VI) and Pb (II) ions onto corncob biomass
is feasible, spontaneous and exothermic in nature.