2 (Langmuir, Freundlich, Elovich, Temkin, and Dubinin-Radushkevich) and 3 (Sips and Redlich-Peterson)-parameter isotherm models were applied to evaluated for the applicability of adsorption of Cu(II) and/or phosphate isotherm using chitosan bead. Non-linear and linear isotherm adsorption were also compared on each parameter with coefficient of determination (R2). Among 2-parameter isotherms, non-linear Langmuir and Freundlich isotherm showed relatively higher R2 and appropriate maximum uptake (qm) than other isotherm equation although linear Dubinin-Radushkevich obtained highest R2. 3-parameter isotherm model demonstrated more reasonable and accuracy results than 2-parmeter isotherm in both non-linear and linear due to the addition of one parameter. The linearization for all of isotherm equation did not increase the applicability of adsorption models when error experiment data was included.

ABSTRACT
1. 서 론
2. 재료 및 실험방법
    2.1 Crosslinked-키토산 비드
    2.2 등온흡착
    2.3 2-parameter 등온흡착식
    2.4 3-parameter 등온흡착식
3. 결과 및 고찰
    3.1 비선형 등온흡착식
    3.2 2-parameter 선형등온흡착식
    3.3 3-parameter 등온흡착식
4. 결 론
References

• 김태훈(상명대학교 건설시스템공학과) | Taehoon Kim (Department of Civil Engineering, Sangmyung University)
• 안병렬(상명대학교 건설시스템공학과) | Byungryul An (Department of Civil Engineering, Sangmyung University) Corresponding author