Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Preparation of PVC-LMO Bead with Dioxane Solvent and Adsorptive Properties of Lithium Ions

Dioxane을 용매로 한 PVC-LMO 비드의 제조와 Li+ 흡착특성

  • Kam, Sang-Kyu (Department of Environmental Engineering, Jeju National University) ;
  • You, Hae-Na (Department of Chemical Engineering, Pukyong National University) ;
  • Lee, Min-Gyu (Department of Chemical Engineering, Pukyong National University)
  • Received : 2014.04.16
  • Accepted : 2014.06.16
  • Published : 2014.07.31
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Abstract

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 ${\Delta}H^{\circ}$, ${\Delta}S^{\circ}$ and ${\Delta}G^{\circ}$ were evaluated. The calculated ${\Delta}G^{\circ}$ 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 $Na^+$, $K^+$, $Mg^{2+}$ and $Ca^{2+}$.

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References

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