Sorption Studies on Removal of Malachite Green from Wastewater By Coal fly ash

M.K.Dwivedi; I.P.Tripathi; Atul Kumar Dwivedi

Volume : III, Issue : XI, November - 2014

Sorption Studies on Removal of Malachite Green from Wastewater By Coal fly ash

M. K. Dwivedi, I. P. Tripathi, Atul Kumar Dwivedi

Abstract :

Coal fly ash has been used as a low cost adsorbent for the removal of malachite green from wastewater. Effect of various operating variables, viz., solution pH, adsorbent dose, adsorbate concentration, temperature on the removal of malachite green has been studied. The experimental results indicate that 10 mg L–1 g of coal fly ash was able to remove 99.5% of dye from an initial concentration of 10 mg L–1.Equiliium was achieved in 60 min. The adsorption of malachite green decreased with increasing temperature indicating exothermic nature of the adsorption process. The material exhibits good adsorption capacity and the adsorption data follow the Freundlich model better than the Langmuir model. Isotherms have been used to determine thermodynamic parameters of the process, viz., free energy change, enthalpy change and entropy change.