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KMID : 1024520180270020083
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Journal of the Environmental Sciences
2018 Volume.27 No. 2 p.83 ~ p.90
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Kinetics and Isotherm Analysis of Valuable Metal Ion Adsorption by Zeolite Synthesized from Coal Fly Ash
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Ahn Kab-Hwan
Lee Chang-Han
Lee Min-Gyu
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Abstract
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In this study, zeolite (Z-C2) was synthesized using a fusion/hydrothermal method on coal fly ash (FA) discharged from a thermal power plant in the Ulsan area and then analyzed via scanning electron microscopy (SEM) and X-ray diffraction (XRD). The Z-C2 was characterized in terms of mineralogical composition and morphological analysis. The XRD results showed that its peaks had the characteristics of Na-A zeolite in the range of $2{\theta}$ 수식 이미지 of 7.18~34.18. The SEM images confirmed that the Na-A zeolite crystals had a chamfered-edge crystal structure almost identical to that of the commercial zeolite. The adsorption kinetics of Cu, Co, Mn and Zn ions by Z-C2 were described better by the pseudo-second-order kinetic model more than by the pseudo-first-order kinetic model. The Langmuir model fitted the adsorption isotherm data better than the Freundlich model did. The maximum adsorption capacities of Cu, Co, Mn and Zn ions obtained from the Langmuir model were in the following order : Cu (94.7 mg/g) > Co (77.7 mg/g) > Mn (57.6 mg/g) > Zn (51.1 mg/g). These adsorption capacities are regarded as excellent compared to those of commercial zeolite.
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KEYWORD
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Adsorption, Zeolite, Metal ions, Coal fly ash, Kinetics, Fusion, Hydrothermal
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