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Title: Hexavalent chromium removal from aqueous solution by adsorption on treated sawdust
Authors: Baral, Saroj S
Das, Surendra N
Rath, P
Keywords: Adsorption
Treated sawdust
Isotherm and thermodynamics
Issue Date: 2006
Publisher: Elsevier
Citation: Biochemical Engineering Journal (Accepted)
Abstract: The studies on adsorption of hexavalent chromium were conducted by varying various parameters such as contact time, pH, amount of adsorbent, concentration of adsorbate and temperature. The kinetics of adsorption of Cr(VI) ion followed pseudo second order. Langmuir adsorption isotherm was employed in order to evaluate the optimum adsorption capacity of the adsorbent. The adsorption capacity was found to be pH dependant. Sawdust was found to be very effective and reached equilibrium in 3 h (adsorbate concentration 30 mg l−1). The rate constant has been calculated at 303, 308, 313 and 318 K and the activation energy (Ea) was calculated using the Arrhenius equation. Thermodynamic parameters such as standard Gibbs energy (ΔG°) and heat of adsorption (ΔHr) were calculated. The ΔG° and ΔHr values for Cr(VI) adsorption on the sawdust showed the process to be exothermic in nature. The percentage of adsorption increased with decrease in pH and showed maximum removal of Cr(VI) in the pH range 4.5–6.5 for an initial concentration of 5 mg l−1
Description: Copyright for this article belongs to Elsevier doi:10.1016/j.bej.2006.08.003
Appears in Collections:Journal Articles

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