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KMID : 1024520180270110975
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Journal of the Environmental Sciences
2018 Volume.27 No. 11 p.975 ~ p.982
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Evaluation of Exchange Capacities of Ca2+ and Mg2+ions by Na-A Zeolite Synthesized from Coal Fly Ash
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Lee Chang-Han
Lee Min-Gyu
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Abstract
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In this study, zeolite (Z-C1) was synthesized using a fusion/hydrothermal method from coal fly ash. The morphological structures of Z-C1 were confirmed to be highly crystalline with a cubic crystal structure. Exchange capacities of Ca2+ and Mg2+ ions in a single and a mixed solution reached equilibrium within 120 min. The exchange kinetics of these ions were well predicted by the pseudo-second-order rate equation. The exchange isotherms of the Ca2+ and Mg2+ ions matched the Langmuir isotherm better than the Freundlich isotherm. The maximum cation exchange capacities (qm) obtained by the Langmuir isotherm model were 2.11 mmol/g (84.52 mg/L) and 1.13 mmol/g (27.39 mg/L) for the Ca2+ and Mg2+ ions, respectively.
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KEYWORD
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Adsorption, Ion exchange, Zeolite, Coal fly ash, Kinetic, Isotherm
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