Adsorption of Cd(II) in Aqueous Solution by Peanut Husk Biochar

생물소재인 땅콩껍질 바이오 차를 이용한 수용액의 Cd(II) 제거

  • Choi, Hee-Jeong (Department of Health and Environment, Catholic Kwandong University)
  • 최희정 (가톨릭 관동대학교 보건환경학과)
  • Received : 2018.04.16
  • Accepted : 2018.06.25
  • Published : 2018.09.30


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 ${\Delta}G^o$ confirm that the process whereby Cd(II) is adsorbed onto PHB is feasible and spontaneous in nature. In addition, the value of ${\Delta}G^o$ increase with the temperature, suggesting that a lower temperature is more favorable to the adsorption process. The negative value of ${\Delta}H^o$ indicates that the adsorption phenomenon is exothermic while the negative value of ${\Delta}S^o$ 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.


Supported by : 한국연구재단


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