The present study set out to investigate the adsorption of Cd(II) ions in an aqueous solution by using Peanut Husk Biochar (PHB). An FT-IR analysis revealed that the PHB contained carboxylic and carbonyl groups, O-H carboxylic acids, and bonded-OH groups, such that it could easily adsorb heavy metals. The adsorption of Cd(II) using PHB proved to be a better fit to the Langmuir isotherm than to the Freundlich isotherm. The maximum Langmuir adsorption capacity was 33.89 mg/g for Cd(II). The negative value of ΔGo confirm that the process whereby Cd(II) is adsorbed onto PHB is feasible and spontaneous in nature. In addition, the value of ΔGo increase with the temperature, suggesting that a lower temperature is more favorable to the adsorption process. The negative value of ΔHo indicates that the adsorption phenomenon is exothermic while the negative value of ΔSo suggests that the process is enthalpy-driven. As an alternative to commercial activated carbon, PHB could be used as a low-cost and environmentally friendly adsorbent for removing Cd(II) from aqueous solutions.

Abstract
 1. 서 론
 2. 재료 및 실험방법
  2.1. 흡착제와 흡착물질
  2.2. 실험 및 분석 방법
 3. 결과 및 고찰
  3.1. PHB의 성분 분석 및 FT-IR spectra 분석
  3.2. 다양한 매개변수 실험
  3.3. 초기농도와 등온 흡착식
  3.4. 열역학적 해석
 4. 결 론
 REFERENCES

• 최희정(가톨릭 관동대학교 보건환경학과) | Hee-Jeong Choi (Department of Health and Environment, Catholic Kwandong University) Corresponding author