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Surface Alteration Of Activated Carbon For Detoxification Of Copper (Ii) From Industrial Effluents

Author

Listed:
  • SADAF BHUTTO

    (Department of Chemistry, University of Karachi, Karachi 75270, Pakistan)

  • M. NASIRUDDIN KHAN

    (Department of Chemistry, University of Karachi, Karachi 75270, Pakistan)

Abstract

The low-cost modified activated carbons were prepared from Thar and Lakhra (Pakistan) coals by activation with sulfuric acid and further modified with citric, tartaric and acetic acids for the selective adsorption ofCu(II)from aqueous solution. The original carbon obtained from activated Thar and Lakhra coals at pH 3.0 displayed significant adsorption capacity for lead and insignificant capacity values (0.880 and 0.830 mg⋅g-1) for copper. However, after modification with citric, tartaric and acetic acid the copper adsorption capacities enhanced in the range of 5.56–21.85 and 6.05–44.61 times, respectively. The Langmuir, Freundlich and Temkin adsorption isotherms were used to elucidate the observed sorption phenomena. The isotherm equilibrium data was well fitted by the Langmuir and sufficiently fitted to the Freundlich models. The calculated thermodynamic parameters such as change in Gibbs free energy(ΔG°), enthalpy(ΔH°)and entropy(ΔS°)inferred that the investigated adsorption was spontaneous and endothermic in nature. Based on the results, it was concluded that the surface alteration with citric and tartaric acid, Thar and Lakhra activated carbons had significant potential for selective removal of copper(II) from industrial wastewater.

Suggested Citation

  • Sadaf Bhutto & M. Nasiruddin Khan, 2013. "Surface Alteration Of Activated Carbon For Detoxification Of Copper (Ii) From Industrial Effluents," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 20(02), pages 1-11.
    • Handle: RePEc:wsi:srlxxx:v:20:y:2013:i:02:n:s0218625x13500212
    DOI: 10.1142/S0218625X13500212
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