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KMID : 1024520140230071289
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Journal of the Environmental Sciences
2014 Volume.23 No. 7 p.1289 ~ p.1297
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Preparation of PVC-LMO Bead with Dioxane Solvent and Adsorptive Properties of Lithium Ions
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Kam Sang-Kyu
You Hae-Na
Lee Min-Gyu
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Abstract
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In this study, PVC-LMO beads were prepared by immobilizing lithium manganese oxide (LMO) with poly vinyl
chloride (PVC) diluted in dioxane solvent. XRD and SEM analysis confirmed that LMO was immobilized well in
PVC-LMO beads. The diameter of PVC-LMO beads prepared by dioxane solvent was about 2 mm. The adsorption
experiments of lithium ions by PVC-LMO beads were conducted batchwise. The optimum pH was pH 10. The
adsorption characteristics of lithium ions by PVC-LMO beads was well described by the pseudo-second-order kinetic
model. The maximum adsorption capacity obtained from Langmuir model was 24.25 mg/g. The thermodynamic
parameters such as △H°, △S° and △G° were evaluated. The calculated ΔG° was between ?6.16 and ?4.14 kJ/mol
(below zero), indicating the spontaneous nature of Li+ adsorption on PVC-LMO beads. Also, the results showed that
PVC-LMO beads prepared in this study could be used for the removal of lithium ions from seawater containing
coexisting ions such as Na+, K+, Mg2+ and Ca2+.
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KEYWORD
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Poly vinyl chloride, Lithium manganese oxide, Adsorption, Lithium, Dioxane
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