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KMID : 1024520170260030363
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Journal of the Environmental Sciences
2017 Volume.26 No. 3 p.363 ~ p.371
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Removal Characteristics of Sr Ion by Na-A Zeolite Synthesized using Coal Fly Ash Generated from a Thermal Power Plant
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Lee Chang-Han
Kam Sang-Kyu
Lee Min-Gyu
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Abstract
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This study evaluates the adsorption properties of Sr ions in an aqueous solution of the synthetic zeolite (Z-Y1) prepared using coal fly ash generated from a thermal power plant. In order to investigate the adsorption characteristics, the effects of various parameters such as the initial concentrations of Sr ion, contact time, and solution pH were investigated in a batch mode. The Langmuir and Redlich-Peterson model fitted the adsorption isotherm data better than the Freundlich model. The maximum adsorption capacity of Sr ions, as determined the Langmuir model, was 181.68 mg/g. It was found that by varying the Sr ion concentration, pH, and temperature, the pseudo-second-order kinetic model describes the adsorption kinetics of the Sr ion better than the pseudo-first-order kinetic model. The calculated thermodynamic parameters of H0 and G0
showed that the adsorption of Sr ions on Z-Y1 was occurred through a spontaneous and an endothermic reaction. We found that the adsorption of Sr ions by Z-Y1 was more affected by pH than by temperature and Sr ion concentration.
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KEYWORD
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Coal fly ash, Zeolite, Strontium, Adsorption, Kinetic model
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