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Received April 22, 2011
Accepted May 23, 2011
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Equilibrium, kinetic and thermodynamic study of removal of reactive orange 12 on platinum nanoparticle loaded on activated carbon as novel adsorbent
Chemistry Department, Yasouj University, Yasouj 75914-35, Iran 1Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran 2Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran
Korean Journal of Chemical Engineering, December 2011, 28(12), 2255-2261(7), 10.1007/s11814-011-0142-1
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Abstract
The proposed research describes the synthesis and characterization of platinum nanoparticles loaded on activated carbon (Pt-NP-AC) and its efficient application as novel adsorbent for efficient removal of reactive orange 12 (RO-12). The influences of effective parameters following the optimization of variables on removal percentages, their value was set as 0.015 g Pt-NP-AC, pH 1, contact time of 13 min. At optimum values of all variables at 25 and 50 mgL^(-1) of RO-12 enthalpy (ΔH0) and entropy (ΔS0) changes was found to be 59.89 and 225.076, respectively, which negative value of ΔG0 shows a spontaneous nature, and the positive values of ΔH0 and ΔS0 indicate the endothermic nature and adsorption organized of dye molecule on the adsorbent surface. Experimental data was fitted to different kinetic models including first-order, pseudo-second-order, Elovich and intra-particle diffusion models, and it was seen that the adsorption process follows pseudo-second-order model in consideration to intra-particle diffusion mechanism. At optimum values of all variables, the adsorption process follows the second-order kinetic and Langmuir isotherm model with adsorption capacity 285.143 mg g^(-1) at room temperature.
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References
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Nandi BK, Goswami A, Purkait MK, J. Hazard. Mater., 161(1), 387 (2009)
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Kannan N, Sundaram MM, Dyes Pigm., 51, 25 (2001)
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