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Kinetic and Thermodynamic Studies of Adsorption of Pb (II) by Using Ferrous Sulphide as an Adsorbent

D. Kamalakar, C. V. Subrahmanayam, P. Rohinikumar, L. Nageswara Rao


Poisoning of lead is causing a serious threat to the environment. In the present study the adsorption behaviour of lead was studied in detail by ferrous sulphide in granular form. Ferrous sulphide has the magnetic properties and makes it a better candidate for lead removal. Batch adsorption experiments were carried out by varying different process parameters such as contact time, adsorbent dose, pH, and temperature. Lead adsorption by ferrous sulphide was found to be highly pH sensitive. Maximum lead was adsorbed at around pH 6.8. Study of temperature effect on lead adsorption confirmed the endothermic nature of the process. Other thermodynamic properties were also calculated and found that physical adsorption was dominant with activation energy of 213.254 kJ/mol. Kinetic study revealed that the pseudo second order model was followed by the adsorption process having regression coefficient (R2) 0.99.

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