Thermodynamic and Isothermal Studies of the Biosorption of Cadmium (II) from Solution by Maize Wrapper
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Date
2008-03
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International Journal of Physical Sciences,
Abstract
The removal of Cd (II) from dilute aqueous solution using maize (Zea mays) wrapper as a biosorbent
was studied. The biosorption was pH-dependent with an optimum pH of 5 - 7. It was also time-dependent
and maximum biosorption was obtained after 100 minutes. The adsorption isotherms
obtained fitted well into the Freundlich and Langmuir isotherms. The Freundlich equation obtained was
log = 1.0813 logCe + 0.958 while the Langmuir equation obtained was 1/ = 0.1535/Ce – 0.013. The
correlation factors were 0.99 and 0.99, while the standard deviation values were 0.051and 0.003
respectively. The free energy change obtained for the biosorption at 300 K, initial Cd (II) concentration
of 100mg L-1 was –7.11kJmol-1. These results indicate that maize wrapper has the potential for the uptake of
Cd (II) from industrial effluents.
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Keywords
Biosorption, Cd (II), Freundlich isotherm, Langmuir isotherm