Waste biomass cow dung ash was used as an adsorbent for the removal of Erichrome Black T (EBT) from aqueous solution using simple batch technique. The contact time in terms of adsorption capacity was optimized at 303 and 308K, respectively and it was found to be 60 min for both temperatures. All the experiments were carried out at pH = 7. The adsorption capacity of EBT increased from 0.20 to 0.75 and 0.2 to 0.8 mg/g with 1 g of adsorbent at 303 and 308K, respectively by increasing concentration from 2 to 10 mg/L. The data were employed to Langmuir and Freundlich adsorption isotherm models and because of higher regression co-efficient R2 values at both temperatures the Langmuir adsorption isotherm was found to be well fitted to the data. The adsorption was found to be spontaneous and endothermic at 308K due to negative free energy and positive enthalpy.
Key words: Erichrome Black T, cow dung, adsorption, thermodynamic parameters.
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