Adsorption of Indigo Carmine from Aqueous Solution by Chitosan and Chitosan/Activated Carbon Composite: Kinetics, Isotherms and Thermodynamics Studies 


Vol. 20,  No. 9, pp. 1820-1832, Sep.  2019
10.1007/s12221-019-1107-y


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  Abstract

Activated carbon (AC) obtained from peanut shell, chitosan (CH) obtained from crab shell, and prepared chitosan/ activated carbon (CH/AC) composite were studied in a batch system for the adsorption of indigo carmine (IC) from aqueous solution. Characterizations of AC, CH, and CH/AC were investigated by FTIR, SEM, XRD, zero-point charge pHpzc, thermal analysis, surface area BET, and pore-size distribution. Adsorbent weight (0.01-0.1 g), initial pH solution (2-10), initial indigo carmine concentration (10-50 mg/l) and contact time (0-60 min) were used as parameters in the adsorption equilibrium experiments. Pseudo-second-order kinetic model was found to describe the adsorption process better than pseudo-first-order kinetic model. Langmuir, Freundlich, and Temkin isotherms applied to the adsorption data reveal that AC and CH/AC best fitted Langmuir and Freundlich models when CH data fitted Temkin model with maximum adsorption capacities of 82.64 mg/g for AC, 96.15 mg/g for CH, and 208.33 mg/g for CH/AC at 30 oC. Thermodynamic parameters such as standard Gibbs free energy (Go), standard enthalpy (Ho), and standard entropy (So) were -23.42 kJ/mol, 10.66 kJ/mol, and 112.40 J/K/mol, respectively for CH/AC. The negative value of Go and a positive value of Ho indicate that the removal of indigo carmine by CH/AC is spontaneous and an endothermic process.

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  Cite this article

[IEEE Style]

J. K. Fatombi, E. A. Idohou, S, "Adsorption of Indigo Carmine from Aqueous Solution by Chitosan and Chitosan/Activated Carbon Composite: Kinetics, Isotherms and Thermodynamics Studies," Fibers and Polymers, vol. 20, no. 9, pp. 1820-1832, 2019. DOI: 10.1007/s12221-019-1107-y.

[ACM Style]

Jacques K. Fatombi, Esta A. Idohou, and S. 2019. Adsorption of Indigo Carmine from Aqueous Solution by Chitosan and Chitosan/Activated Carbon Composite: Kinetics, Isotherms and Thermodynamics Studies. Fibers and Polymers, 20, 9, (2019), 1820-1832. DOI: 10.1007/s12221-019-1107-y.

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