Thermodynamics and Kinetics of Adsorption of Eriochrome Black-T from Aqueous Media on Rice bran and on its coal
Abstract
 The commercially rice bran and its coal were used for the adsorption of eriochrome black-T dye from aqueous solutions. The effect of solution pH, initial dye concentration, temperature and adsorption time on dye removal were studied using  UV–Visible spectroscopy technique at ג max = 541 nm. The equilibrium time was found to be 30 minutes on each surface.The best results were achieved at pH=3 and T= 293 K. The equilibrium adsorption isotherm have been analyzed by linear Freudlich and Langmuir models.The thermodynamic parameters, ∆G ,∆H , and ∆S were calculated. The negative value of ∆H indicates that the adsorption process is exothermic.The kinetic of the adsorption on each surface was analyzed using the  pseudo – first order and pseudo second order kinetic models . The adsorption of the dye on rice bran is higher than that on its coal .Key words:- rice bran, coal , Adsorption isotherms. Thermodynamics and Kinetics of   dsorption.
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