- Department of Biotechnology, Karpaga Vinayaga College of Engineering and Technology,
Maduranthagam-603308, TamilNadu, India - Department of Chemical Engineering, Annamalai University, Tamil Nadu, India
Dye containing waste water can cause serious water pollution problems by
hindering light penetration and photo synthesis and toxicity from heavy
metals associated with dyes. In this research study, batch experiments
were conducted using thermally activated Eichornia crassipes roots as an
adsorbent for the removal a basic dye, malachite green, from aqueous
solutions.
Effect of operating variables i.e. pH, sorbent dosage, dye
concentration and contact time was studied in an agitated batch
adsorber. Results showed that maximum dye uptake was observed at an
optimum pH 7 .There was no significant difference in dye concentration
remaining when the pH increased from 5-10. Dye removal was influenced by
initial dye concentration and the sorption process followed first order
kinetics. Among the three isotherms tested Redlich Peterson and
Langmuir isotherms fitted reasonably well to the data. The negative
value of the free energy change indicates the spontaneous nature of
biosorption. From the above findings, it was observed that the
biosorption process obeyed the first order adsorption kinetics. The
negative value of the free energy change calculated indicates the
spontaneous nature of the sorption and confirms the affinity between the
sorbent and the dye cations.
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