• Adsorption of Heavy Metals by Natural Adsorbents of Green Tea and Ginseng Leaves
  • Kim, Sohyun;Song, Jinyoung;Yoon, Kwangsuk;Kang, Eunmi;Song, Hocheol;
  • Department of Environment & Energy, Sejong University;Department of Environment & Energy, Sejong University;Department of Environment & Energy, Sejong University;YADAH corporation;Department of Environment & Energy, Sejong University;
  • 녹차잎과 인삼잎의 중금속 흡착능 평가 연구
  • 김소현;송진영;윤광석;강은미;송호철;
  • 세종대학교 환경에너지융합학과;세종대학교 환경에너지융합학과;세종대학교 환경에너지융합학과;(주)야다;세종대학교 환경에너지융합학과;
Abstract
This work presents the adsorption capability of green tea and ginseng leaves to adsorb heavy metals such as Cd(II), Cu(II), and Pb(II) in aqueous solution. FT-IR analysis indicates the presence of oxygen containing functional groups (carboxyl groups) in two kinds of leaves. High pH condition was favorable to the adsorption of heavy metal ions due to the enhanced electrostatic attraction and the precipitation reaction of metal ions. The adsorption of Cd(II), Cu(II), and Pb(II) reached equilibrium within 10 min, achieving high removal efficiencies of 80.3-97.5%. The adsorption kinetics data of heavy metal ions were fitted well with the pseudo-second-order kinetic model. The maximum adsorption amounts of Cd(II), Cu(II), and Pb(II) ions were 8, 3.5, and 15 mg/g, respectively, in the initial concentration range from 0.15 to 0.75 mM. Based on the fitting data obtained from isotherm models, heavy metal adsorption by green tea and ginseng leaves could occur via multi-layer sorption.

Keywords: Green tea leaves;Ginseng leaves;Heavy metal;Adsorption;Oxygen containing functional groups;

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