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KMID : 1024520190280010055
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Journal of the Environmental Sciences
2019 Volume.28 No. 1 p.55 ~ p.64
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Characteristics of Cu and Cs Ions adsorbed on an immobilized Adsorbent including Zeolite Synthesized from Jeju Scoria
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Lee Chang-Han
Kam Sang-Kyu
Lee Min-Gyu
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Abstract
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The adsorption properties of Cs+ and Cu2+ ions were evaluated by using a polysulfone scoria zeolite (PSf-SZ) composite with synthetic zeolite synthesized from Jeju volcanic rocks (scoria). In order to investigate the adsorption properties, various parameters, such as pH, contact time, reaction rate, concentration, and temperature in aqueous solutions, were evaluated by tests carried out in batch experiments. The adsorption capacities of Cs+ and Cu2+ ions increased between pH 2 but achieved equilibrium at pH 4 and above. The adsorption rate increased rapidly up to the initial 24 h, after which it plateaued ; the adsorption rate then sustained at equilibrium from 48 h. The adsorption kinetics of Cs+ and Cu2+ ions were described better by the pseudo-second-order kinetic model than the pseudo-first-order kinetic model. The Langmuir model fitted the adsorption isotherm data better than the Freundlich model. The maximum adsorption capacities of Cs+ and Cu2+ ions obtained from the Langmuir model were 53.8 mg/g and 84.7 mg/g, respectively. The calculated thermodynamic parameters showed that the adsorption of Cs+ and Cu2+ ions on PSf-SZ was feasible, spontaneous and endothermic reaction.
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KEYWORD
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Scoria, Zeolite, Copper, Cesium, Adsorption, Kinetic, Isotherm
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