Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Comparison of Heavy Metal Adsorption by Manganese Oxide-Coated Activated Carbon according to Manufacture Method

활성탄-망간 산화물 합성소재의 제조방법에 따른 중금속 흡착특성 비교

  • Lee, Seul Ji (Department of Environmental Engineering, Green Technology Institute.Gyeongnam National University of Science and Technology) ;
  • Lee, Myoung-Eun (Department of Environmental Engineering, Green Technology Institute.Gyeongnam National University of Science and Technology) ;
  • Chung, Jae-Woo (Department of Environmental Engineering, Green Technology Institute.Gyeongnam National University of Science and Technology)
  • 이슬지 (경남과학기술대학교 환경공학과.녹색기술연구소) ;
  • 이명은 (경남과학기술대학교 환경공학과.녹색기술연구소) ;
  • 정재우 (경남과학기술대학교 환경공학과.녹색기술연구소)
  • Received : 2013.11.18
  • Accepted : 2013.12.11
  • Published : 2014.01.31
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Abstract

The adsorption characteristics of Pb(II) and Cu(II) by the manganese oxide-coated activated carbon (MOAC) were investigated by series of batch experiments. MOAC was prepared by three types of manufacturing methods such as chemical precipitation method (CP), hydrothermal method (HT) and supercritical method (SC). Pseudo-second-order and Langmuir models adequately described kinetics and isotherm of Pb(II) and Cu(II) adsorption on the experimented adsorbents. These results indicated that heavy metal ions were chemically adsorbed onto uniform monolayered adsorption sites. The coating of manganese oxide enhanced the adsorption capacities of AC. And adsorption capacities of Pb(II) and Cu(II) were significantly affected by the manufacturing method of MOAC. The highest adsorption performance was obtained by using SC, followed by HT and CP, which is caused from high uniformity and amount of manganese oxide coated onto AC induced by high temperature and pressure. These results show that MOAC can be used as an effective adsorbent to remediate heavy metal contaminated environment.

망간산화물이 코팅된 활성탄(MOAC)에 의한 Pb와 Cu 흡착의 동역학적 특성과 등온흡착 특성을 규명하기 위해 회분식 실험을 수행하였다. MOAC는 화학적 침전법(CP), 수열법(HT)과 초임계법(SC)으로 제조하였으며 제조방법별 중금속 흡착특성을 비교하였다. 실험된 흡착소재에 의한 Pb와 Cu의 흡착은 2차 반응속도 모델과 Langmuir 모델에 의해 적절하게 설명될 수 있는 것으로 나타나 흡착소재의 단분자층에서 이루어지는 균일한 흡착임을 알 수 있었다. Pb와 Cu 흡착용량은 활성탄(AC)에 망간산화물을 코팅시킴으로써 크게 증가하는 것으로 나타났으며 MOAC의 제조방법에 의해 영향을 받는 것으로 나타났다. CP, HT, SC의 순으로 활성탄 표면에 코팅된 망간산화물의 양과 균일성이 증가하며 그로인해 흡착용량이 증가하는 것으로 나타났다. 본 연구의 결과는 MOAC가 중금속으로 오염된 환경을 정화시키기 위해 적절하게 활용될 수 있음을 보여준다.

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