The characteristics of ammonia-nitrogen (NH4 +-N) adsorption by a zeolitic material synthesized from Jeju scoria using the fusion and hydrothermal method was studied. The synthetic zeolitic material (Z-SA) was identified as a Na-A zeolite by X-ray diffraction, X-ray fluorescence analysis and scanning electron microscopy images. The adsorption of NH4 +-N using Jeju scoria and different types of zeolite such as the Z-SA, natural zeolite, and commercial pure zeolite (Na-A zeolite, Z-CS) was compared. The equilibrium of NH4 +-N adsorption was reached within 30 min for Z-SA and Z-CS, and after 60 min for Jeju scoria and natural zeolite. The adsorption capacity of NH4 +-N increased with approaching to neutral when pH was in the range of 3-7, but decreased above 7. The removal efficiency of NH4 +-N increased with increasing Z-SA dosage, however, its adsorption capacity decreased. For initial NH4 +-N concentrations of 10-200 mg/L at pH 7, the adsorption rate of NH4 +-N was well described by the pseudo second-order kinetic model than the pseudo first-order kinetic model. The adsorption isotherm was well fitted by the Langmuir model. The maximum uptake of NH4 +-N obtained from the Langmuir model decreased in the order of Z-CS (46.8 mg/g) > Z-SA (31.3 mg/g) > natural zeolite (5.6 mg/g) > Jeju scoria (0.2 mg/g).

Abstract
1. 서 론
    2.1. 실험 재료
    2.2. 흡착제의 특성 분석
    2.3. 흡착제에 의한 암모니아성 질소의 흡착 실험
3. 결과 및 고찰
    3.1. 흡착제의 물리화학적 특성
    3.2. 접촉시간의 영향
    3.3. 초기 pH의 영향
    3.4. 흡착제의 양의 영향
    3.5. 흡착 속도
    3.6. 흡착등온식
4. 결 론
REFERENCES

• 이창한(부산가톨릭대학교 환경행정학과) | Chang-Han Lee (Department of Environmental Administration, Catholic University of Pusan, Busan 46252, Korea)
• 현성수(제주특별자치도 보건환경연구원) | Sung-Su Hyun (Research Institute of Health & Environment, Jeju Special Self-Governing Province, Jeju 63142, Korea)
• 감상규(제주대학교 환경공학과) | Sang-Kyu Kam (Department of Environmental Engineering, Jeju National University, Jeju 63243, Korea) Corresponding author