The adsorption of lithium ion onto zeolite was investigated depending on contact time, initial concentration, cation forms, pH, and adsorption isotherms by employing batch adsorption experiment. The zeolite was converted into different forms such K+, Na+, Mg2+, Ca2+, and Al3+. The zeolite had the higher adsorption capacity of lithium ion in K+ form followed by Na+, Ca2+, Mg2+, and Al3+ forms, which was in accordance with their elctronegativities. The lithium ion adsorption was explained using the Langmuir, Freundlich, and Dubinin-Radushkevich adsorption isotherms and kinetic models. Adsorption rate of lithium ion by zeolite modified in K+ form was controlled by pseudo-second-order and particle diffusion kinetic models. The maximum adsorption capacity obtained from Langmuir isotherm was 17.0 mg/g for zeolite modified in K+ form. The solution pH influenced significantly the lithium ions adsorption capacity and best results were obtained at pH 5-10.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 재료
  2.2. 실험방법
 3. 결과 및 고찰
  3.1. 흡착제 제올라이트의 세공특성 및 흡착특성
  3.2. 치환한 이온에 따른 제올라이트의 리튬 흡착능 비교
  3.3. 흡착등온식
  3.4. 농도에 따른 흡착속도
  3.5. 흡착 메커니즘
  3.6. pH의 영향
 4. 결 론
 참 고 문 헌

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