Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Adsorption of Pb(II) by Cherry (Prunus x yedoensis) Leaf-Derived Biochar

왕벚나무 잎으로 제조된 바이오차의 Pb(II) 흡착특성

  • Lee, Myoung-Eun (Department of Urban System Engineering, Gyeongnam National University of Science and Technology (GNTECH)) ;
  • Hwang, Kyu-Taek (Department of Environmental Engineering, GNTECH) ;
  • Kim, Sun-Young (Department of Environmental Engineering, GNTECH) ;
  • Chung, Jae-Woo (Department of Environmental Engineering, GNTECH)
  • 이명은 (경남과학기술대학교 도시시스템공학과) ;
  • 황규택 (경남과학기술대학교 환경공학과) ;
  • 김선영 (경남과학기술대학교 환경공학과) ;
  • 정재우 (경남과학기술대학교 환경공학과)
  • Received : 2018.05.07
  • Accepted : 2018.05.29
  • Published : 2018.06.30
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Abstract

Large amounts of leaves from street trees fall onto the streets annually and need to be cleaned and treated. Cherry trees are common street trees in Korea. The adsorption characteristics of Pb(II) by cherry leaf (CL) and cherry leaf-derived biochar (CB) were studied through a series of batch experiments. CB was produced through the carbonization of CL at $800^{\circ}C$ for 90 min. Carbonization increased the C content and pH value, while decreased H and O contents. Well developed pore structure was observed at the surface of CB. The pseudo-second order model better described the kinetics of Pb(II) adsorption onto CL and CB, indicating that the rate-limiting step of the heavy metal sorption is chemical sorption. Fast adsorption rates and high adsorption capacities were obtained by the carbonization from CL to CB. Langmuir models better adequately described the Pb(II) adsorption onto CL and CB. Maximum adsorption capacities of Pb(II) expressed by Langmuir constant, $Q^0$ were 37.31 mg/g and 94.34 mg/g, when CL and CB were used as adsorbents, respectively.

매년 가로수로부터 많은 양의 낙엽이 발생하고 이는 적절하게 수거하여 처리해야 한다. 왕벚나무는 우리나라에서 일반적인 가로수이다. 왕벚나무 잎(CL)과 그것으로부터 제조된 바이오차(CB)의 Pb(II) 흡착특성에 관한 회분식 실험을 수행하였다. 바이오차는 $800^{\circ}C$에서 90분간 탄화시켜 제조하였다. 흡착특성을 규명하기 위해 동력학적 및 등온 흡착실험을 수행하였다. 탄화과정은 바이오차의 탄소함량과 pH 값을 증가시키고 수소와 산소함량을 감소시켰다. 또한, 잘 발달된 공극 구조가 바이오차의 표면에 관찰되었다. CL과 CB에 의한 Pb(II) 흡착은 2차 속도모델에 의해 적절하게 설명될 수 있는 것으로 나타나 흡착반응의 속도가 물리적 흡착보다는 화학적 흡착에 의해 결정됨을 알 수 있었다. CB는 CL에 비해 더 빠른 흡착반응과 높은 흡착용량을 가지는 것으로 나타났다. Pb(II)의 등온흡착 특성은 Langmuir 모델에 의해 보다 적절하게 설명될 수 있는 것으로 나타났다. Langmuir 상수, $Q^0$에 의해 설명되는 최대흡착용량은 CL이 37.31 mg/g, CB가 94.34 mg/g으로 나타났다.

Keywords

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