In this study, zeolitic materials were synthesized from Jeju Volcanic Rocks (JVR) using a fusion/hydrothermal method at NaOH/JVR ratios of 0.6 and 1.2. The crystallinities of the zeolitic materials at NaOH/JVR ratios of 0.6 and 1.2 were 25.5% and 59.0%, respectively. It was confirmed through the SEM image that the zeolitic materials covered the zeolite particle with a cube-shaped crystals. The Co ions adsorption by the zeolitic materials were to reach the adsorption equilibrium at 120 min. It could be better simulated in the pseudo-second order adsorption kinetic equation than in the pseudo-first order adsorption kinetic equation. The adsorption capacities (qm) of Co ions could be to estimate Langmuir isotherm better than Freundlich isotherm. The maximum adsorption capacities (qm) at NaOH/JVR ratios of 0.6 and 1.2 were 55.3 mg/g and 68.7 mg/g, respectively. It was found that there was a high correlation between the crystallinity of zeolitic materials and the adsorption capacity of Co ions adsorption.

Abstract
1. 서 론
2. 재료 및 방법
3. 결과 및 고찰
    3.1. 제올라이트화 물질의 합성
    3.2. 접촉시간에 따른 Co의 흡착량
    3.3. Co의 흡착속도 해석
    3.4. 등온흡착
4. 결 론
REFERENCES

• 조은님(부산광역시 보건환경연구원) | Eunnim Cho (Busan Metropolitan City Institute of Health & Environment)
• 이창한(부산가톨릭대학교 환경행정학과) | Chang-Han Lee (Department of Environmental Administration, Catholic University of Pusan)
• 김문일(부산가톨릭대학교 환경행정학과) | Moon il Kim (Department of Environmental Administration, Catholic University of Pusan) Corresponding author