Abstract
In the present study, the retention capacity of carbonaceous material obtained from the diesel engine exhaust mufflers for Cr(VI) removal has been investigated. The physicochemical properties such as density, pH of aqueous slurry, pH at point of zero charge, ash content, moisture content, volatile matter, surface area, scanning electron microscopy and electron dispersive spectroscopy of the carbonaceous material were determined. The capacity of adsorbent for removal of Cr(VI) from aqueous solution was observed under different experimental condition like contact time, initial concentration of metal ions, pH and temperatures on the adsorption capacity of the adsorbent. Maximum adsorption of Cr(VI) ions was found at low pH. The adsorption process was found to follow second-order kinetics. The rate constant was evaluated at different temperatures along with other thermodynamic parameters like activation energy, Gibbs free energy change, enthalpy change and entropy change. Both Langmuir and Freundlich isotherms were used to describe the adsorption equilibrium of carbonaceous material at different temperatures. Langmuir isotherm shows better fit than Freundlich isotherm at given conditions. The result shows that low-cost carbonaceous material from diesel engine exhaust mufflers can be efficiently used for wastewater treatment containing Cr(VI) ions.
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Acknowledgments
The authors gratefully acknowledge the cooperation of Lab technician of Centralized Resource Laboratory (CRL) Department of Physics, University of Peshawar, Pakistan for the analysis of the carbonaceous material.
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Hussain, S., Gul, S., Khan, S. et al. Retention studies of chromium (VI) from aqueous solution on the surface of a novel carbonaceous material. Arab J Geosci 6, 4547–4556 (2013). https://doi.org/10.1007/s12517-012-0745-9
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DOI: https://doi.org/10.1007/s12517-012-0745-9