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1 Polish Journal of Chemical Technology

1 2002

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Removal of Ni(II) from aqueous solutions using fly ash and montmorillonite

Banerjee S., Jayaram R.V.

Polish Journal of Chemical Technology

2002

Vol. 4, nr 4

6-10

Adsorption of toxic metal ions like Ni(II) on heat treated montmorillonite, fly ash and impregnated fly ash was studied in terms of different parameters like initial metal ion concentrations, pH and temperature. Impregnated fly ash (IFAA1) showed much higher levels of adsorption capacity as compared to fly ash and heat-treated montmorillonite. The various rate parameters of the adsorption process have also been determined. Equilibrium adsorption model was arrived, based on Langmuir isotherm and the corresponding constants have been evaluated. Thermodynamic studies have also been carried out and values of standard free energy (AG°), enthalpy (AH°) and entropy (AS°) were calculated. The adsorption was found to be exothermic by these studies.