The aim of this work was to find the biosorption characteristics
of A. bisporus for the removal of Cr (VI) ions.
The maximum biosorption capacity was obtained pH 1.0. In
this study, the results showed that high temperatures increased
the biosorption capacity of Cr (VI) by A. bisporus. The
biosorption capacity decreased as the biosorbent concentration
increased.
The Freundlich and Langmuir biosorption models were used
for the mathematical description of the biosorption equilibrium
of Cr (VI) ions to A. bisporus. It was seen that the biosorption
equilibrium data fitted well to the Langmuir.
The suitability of the first- and second-order equations,
kinetic model for the biosorption of Cr (VI) onto A. bisporus is
also discussed. The pseudo-second-order kinetic model agrees
very well with the dynamical behavior for the biosorption of Cr
(VI) onto A. bisporus.
Thermodynamic constants were also evaluated using equilibrium
constants changing with temperature. The negative value
of G◦ indicated the spontancity and the positive values of H◦
and S◦ showed the endothermic nature and irreversibility of
Cr (VI) biosorption, respectively.
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