Adsorption of the cationic dyes: Rhodamine B and Nile Blue Sulphate, from their aqueous solutions, on alumina was investigated. The adsorption of the dyes was found to decrease with the increase in temperature of the solutions. The adsorption isotherms obtained at different temperatures were found to obey the Langmuir isotherm equation. Free energy, entropy and enthalpy of the adsorption were calculated from the isotherms and the values, obtained for these thermodynamic parameters, were interpreted. The thermodynamic data indicate that the adsorption of these dye molecules on alumina is more favourable at high temperature.
F MAHMOOD ,M SALEEM ,A HAMEED ,M AFZAL ,
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