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KMID : 1024520140230111821
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Journal of the Environmental Sciences
2014 Volume.23 No. 11 p.1821 ~ p.1826
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Adsorption Characteristics of Methylene Blue from Aqueous Solution According to Physical and Surface Properties of Activated Carbons
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Kam Sang-Kyu
You Hae-Na
Lee Min-Gyu
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Abstract
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The adsorption characteristics of the methylene blue (MB) were studied using three activated carbons such as ACA
and ACB with similar specific surface area (1,185 and 1,105 m2/g), and ACC with relatively high specific surface area
(1,760 m2/g). The surface chemical properties of these activated carbons were investigated by X-ray photoelectron
spectroscopy (XPS). The results indicated that ACA had more functional groups (with phenol, carbonyl, and carboxyl
etc.) than ACB (with carbonyl and carboxyl) and ACC (with carboxyl). The isotherm data were fitted well by Langmuir
isotherm model. The adsorption capacities of ACA, ACB, and ACC for MB were 454.7 mg/g, 337.7 mg/g, and 414.0
mg/g, respectively. As phenol and carboxyl content of the surface on activated carbon increased, MB adsorption
capacity was increased. Although ACA had a smaller specific surface area than ACC, the content of phenol and
carboxyl group was abundant, so MB adsorption capacity was found to be higher than ACC.
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KEYWORD
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Activated carbon, Methylene blue, Surface chemical properties, Adsorption
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