Waste citrus peel-based activated carbon (WCAC) was prepared from waste citrus peels by activation with KOH. The removal of Cu and Pb ions from aqueous solution by the prepared WCAC was investigated in batch experiments. The solution pH significantly influenced Cu and Pb adsorption capacity and the optimum pH was 4 to 6. The adsorption of Cu and Pb ions by WCAC followed pseudo-second-order kinetics and the Langmuir isotherm model. The maximum adsorption capacity calculated by Langmuir isotherm model was 31.91 mg/g for Cu and 92.22 mg/g for Pb. As the temperature was increased from 303 K to 323 K, the ΔG˚ value decreased from –7.01 to –8.57 kJ/mol for Cu ions and from –0.87 to –2.06 kJ/mol for Pb ions. These results indicated that the adsorption of Cu and Pb by WCAC is a spontaneous process.

Abstract
 1. 서 론
 2. 실험 재료 및 방법
 3. 결과 및 고찰
  3.1. 흡착제의 특성분석
  3.2. pH의 영향
  3.3. 시간에 따른 흡착량 변화
  3.4. 속도식
  3.5. 흡착등온식
  3.6. 열역학적 해석
 4. 결 론
 REFERENCES

• 문명준(부경대학교 공업화학과) | Myung-Jun Moon (Department of Industrial Chemistry, Pukyong National University)
• 김상규(제주대학교 환경공학과) | Sang-Kyu Kam (Department of Environmental Engineering, Jeju National University)
• 이민규(부경대학교 화학공학과) | Min-Gyu Lee (Department of Chemical Engineering, Pukyong National University) Corresponding author