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KMID : 1024520210300090719
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Journal of the Environmental Sciences
2021 Volume.30 No. 9 p.719 ~ p.726
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Removal of Cobalt Ion in Aqueous Solution Using Zeolitic Materials Synthesized from Jeju Volcanic Rocks
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Cho Eun-Nim
Lee Chang-Han
Kim Moon-Il
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Abstract
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In this study, zeolitic materials were synthesized from Jeju Volcanic Rocks (JVR) using a fusion/hydrothermal method at NaOH/JVR ratios of 0.6 and 1.2. The crystallinities of the zeolitic materials at NaOH/JVR ratios of 0.6 and 1.2 were 25.5% and 59.0%, respectively. It was confirmed through the SEM image that the zeolitic materials covered the zeolite particle with a cube-shaped crystals. The Co ions adsorption by the zeolitic materials were to reach the adsorption equilibrium at 120 min. It could be better simulated in the pseudo-second order adsorption kinetic equation than in the pseudo-first order adsorption kinetic equation. The adsorption capacities (qm) of Co ions could be to estimate Langmuir isotherm better than Freundlich isotherm. The maximum adsorption capacities (qm) at NaOH/JVR ratios of 0.6 and 1.2 were 55.3 mg/g and 68.7 mg/g, respectively. It was found that there was a high correlation between the crystallinity of zeolitic materials and the adsorption capacity of Co ions adsorption.
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KEYWORD
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Adsorption, Kinetics, Volcanic rocks, Zeolitic material, Cobalt
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