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+.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. PVC-LMO 비드의 제조
  2.2 실험방법
 3. 결과 및 고찰
  3.1 PVC-LMO 비드의 특성
  3.2. pH의 영향
  3.3. PVC-LMO 비드에 의한 시간에 따른 Li+ 흡착능 변화
  3.4. 흡착등온선
  3.5. 열역학적 고찰
  3.6. 염의 영향
 4. 결론
 참 고 문 헌

• 감상규(제주대학교 환경공학과) | Sang-Kyu Kam (Department of Environmental Engineering, Jeju National University)
• 유해나(부경대학교 화학공학과) | Hae-Na You (Department of Chemical Engineering, Pukyong National University)
• 이민규(부경대학교 화학공학과) | Min-Gyu Lee (Department of Chemical Engineering, Pukyong National University) Corresponding author