The adsorption characteristics of Cu ions were studied using the zeolite Na-A synthesized from Jeju volcanic rocks. The effects of various operating parameters such as initial concentration of Cu ions, contact time, solution pH, and solution temperature were investigated in batch experiments. The adsorption of Cu ions by Na-A zeolite was fitted well by pseudo-second-order kinetics and the Langmuir isotherm model. The maximum adsorption capacity determined using the Langmuir isotherm model was 152.95 mg/g. In addition, the adsorption of Cu ions by zeolite Na-A was primarily controlled by particle diffusion model in comparison with the film diffusion model. As the temperature increased from 303 K to 323 K, ΔG˚ decreased from -2.22 kJ/mol to –3.41 kJ/mol, indicating that the adsorption of Cu ions by Na-A zeolite is spontaneous process.

Abstract
 1. 서 론
 2. 실험 재료 및 방법
 3. 결과 및 고찰
  3.1. pH의 영향
  3.2. 시간에 따른 흡착량 변화
  3.3. 흡착 속도식
  3.4. 확산 모델식
  3.5. 흡착 등온식
 4. 결 론
 REFERENCES

• 주창식(부경대학교 화학공학과) | Chang-Sik Ju (Department of Chemical Engineering, Pukyong National University)
• 이창한(부산가톨릭대학교 환경행정학과) | Chang-Han Lee (Department of Environmental Adminstration, Catholic University of Pusan)
• 이민규(부경대학교 화학공학과) | Min-Gyu Lee (Department of Chemical Engineering, Pukyong National University) Corresponding author