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KMID : 1024520130220091161
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Journal of the Environmental Sciences
2013 Volume.22 No. 9 p.1161 ~ p.1170
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Adsorption Characteristics of Methylene Blue and Phenol from Aqueous Solution using Coal-based Activated Carbon
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Lee Song-Woo
Kam Sang-Kyu
Lee Min-Gyu
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Abstract
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The efficiency of coal-based activated carbon in removing methylene blue (MB) and phenol from aqueous solution was
investigated in batch experiments. The batch adsorption kinetics were described by applying pseudo-first-order,
pseudo-second-order, and first order reversible reaction. The results showed that the adsorption of MB and phenol occurs
complexed process including external mass transfer and intraparticle diffusion. The maximum adsorption capacity obtained from Langmuir isotherm was 461.0 mg/g for MB and 194.6 mg/g for phenol, respectively. The values of activation parameters such as free energy (△Go), enthalpy (△Ho), and entropy (△So) were also determined as -19.0∼-14.9 kJ/mol, 25.4 kJ/mol, and 135.2 J/mol K for MB and 51.8∼54.1 kJ/mol, -29.0 kJ/mol, and -76.4 kJ/mol K for phenol, respectively. The MB adsorption was found to be endothermic and spontaneous process. However, the CV adsorption was found to be exothermic and non-spontaneous process.
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KEYWORD
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Activated carbon, Adsorption, Dye, Phenol, Methylene blue
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