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EQUILIBRIUM MODELLING AND THERMODYNAMICS OF REMOVAL OF ORANGE G FROM ITS AQUEOUS SOLUTIONS

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Author(s): JIWAN SINGH | UMA | SUSHMITA BANERJEE | DEEPAK GUSAIN | YOGESH C. SHARMA

Journal: Journal of Applied Sciences in Environmental Sanitation
ISSN 0126-2807

Volume: 6;
Issue: 3;
Start page: 317;
Date: 2011;
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Keywords: Removal | Orange G | equilibrium modelling | thermodynamics

ABSTRACT
Application of saw dust (raw and modified) was investigated for the removal of Orange G from its aqueous solutions. The raw saw dust was modified by sulphuric acid and sodium bicarbonate. The adsorbents were characterized by using sophisticated techniques like Fourier Transformation Infrared (FT-IR) Spectrometer and Scanning Electron Microscope (SEM). The physicochemical properties of the saw dusts were determined and its elemental analysis was also carried out. Equilibrium modelling of the process of removal of selected dye was carried out and the data were fitted to Langmuir and Freundlich isotherm models. Both the Langmuir and Freundlich models fitted the adsorption data properly. An appreciable adsorption capacity for the removal of Orange G by using raw and modified sawdust was observed. The maximum adsorption capacity was found to be 0.40 mgg−1 for an initial concentration of 2.5 mgL−1 of Orange G at a dose of 1.0 gL−1 of the adsorbent. Thermodynamic studies for the process of removal were carried out and the parameters namely change in free energy, enthalpy and entropy were calculated. The negative values of ∆G, the free energy change are indicative of the spontaneous nature of the process of dye removal, whereas the value of enthalpy change ∆H (-15.392 kJ/mol) indicate that the adsorption involves an exothermic process.
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