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Abstract: Synthesis of PVC-LMO Beads Using Dioxane and Dimethyl Sulfoxide Solvent and Adsorption Characteristics of Lithium Ion

Hae Na You

Department of Chemical engineering, The Graduate School,
Pukyong National University

Abstract
In this study, PVC-LMO beads were synthesised by immobilizing lithium manganese oxide (LMO) with poly vinyl chloride (PVC) diluted in different kinds of solvents such as dioxane and dimethyl sulfoxide (DMSO). XRD analysis confirmed that LMO was immobilized well in PVC-LMO beads. The diameters of PVC-LMO(dioxane) and PVC-LMO(DMSO) prepared were determined to be 2 mm and 4 mm, respectively. The adsorption characteristics of LMO, PVC-LMO(dioxane), and PVC-LMO(DMSO) for lithium ions were investigated batchwise. The maximum adsorption capacities of lithium ions obtained from Langmuir isotherm for PVC-LMO(dioxane) and PVC-LMO(DMSO) found to be 23.24 mg/g and 21.31 mg/g, respectively. The PVC-LMO beads turned out to have remarkably high lithium selectivity in the presence of Na+, K+, Mg2+ and Ca2+.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/1349
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001966758

Table Of Contents: 1. 서 론 1

2. 이 론 4
2. 1. 리튬의 특성 4
2. 2. 해수 중의 유용금속 회수 방법 8
2. 2. 1 공침(Co-precipitation) 8
2. 2. 2. 용매 추출(Solvent-extraction) 8
2. 2. 3. 생물 농축(Biological concentration) 9
2. 2. 4 흡착(Adsorption) 9
2. 3. 리튬망간산화물 10
2. 3. 1 스피넬 구조 10
2. 3. 2. 리튬망간산화물 13
2. 4. 고정화 방법 15
2. 4. 1. 흡착(Adsorption) 15
2. 4. 2. 공유결합(Covalent binding) 17
2. 4. 3. 가두기(Matrix entrapment) 18
2. 4. 4. 캡슐화(Encapsulation) 19
3. 실험 재료 및 방법 20
3. 1. PVC-LMO 비드의 합성 20
3. 2. 실험방법 및 분석 23
3. 2. 1. 시료의 특성분석 23
3. 2. 2. 리튬이온 흡착실험 23
4. 결과 및 고찰 25
4. 1. XRD 분석 25
4. 2. 물리적 특성 27
4. 2. 1. PVC-dioxane과 PVC-DMSO 용액의 물리적 특성 27
4. 2. 2 PVC-LMO(dioxane)과 PVC-LMO(DMSO) 비드의 물리적 특성 29
4. 3. SEM 분석 32
4. 4. 시간에 따른 리튬이온의 흡착량 변화 37
4. 3. 흡착속도 39
4. 6. 흡착등온식 43
4. 7. 열역학적 고찰 49
4. 8. 용액 pH에 따른 리튬이온 흡착 52
4. 9. 염의 영향 54

5. 결 론 58
References 60

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