Kinetic and thermodynamic study of dye removal by carbonized eucalyptus bark and its surface derivatives

Adsorption of basic dye on carbonized Eucalyptus bark and its surface derivatives has been investigated. Several experiments have been carried out by using batch adsorption technique. Basic violet 10(Rhodamine B) has been used as a model dye and the effects of process variables like effect of adsorbent dosage, pH, contact time, temperature; initial dye concentration has been evaluated. The adsorption of basic violet 10 was found to take place at pH>pHzpc for all the adsorbents. Thermodynamic parameters like ΔGo, ΔHoand ΔS0are determined and the processes were found to be entropy driven in nature. The study highlights the application of low cost carbons for the removal of dyes from aqueous medium by the ion exchange process. The kinetics followed was first order and Langmuir and Freundlich isotherm fitted the data well. Scanning electron microscopic analysis and Fourier transform infra red spectroscopy (FTIR) reveals a noticeable surface morphology change with electrostatic complexation after surfactant modification.

Author(s): Ekta Khosla, Satindar Kaur and Pragnesh N. Dave

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