Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Effect of Surface-Modification of Activated Carbon for Adsorption of Uranium in Radioactive Liquid Wastes

방사성 액체 폐기물 내 우라늄 흡착에 대한 활성탄의 표면 처리 영향

  • Jang, J.D. (Dept. of Envir. Eng., Chungnam National University) ;
  • Lee, K.W. (Korea Atomic Energy Research Institute) ;
  • Song, K.C. (Korea Atomic Energy Research Institute) ;
  • Kang, H. (Dept. of Envir. Eng., Chungnam National University) ;
  • Oh, W.Z. (Korea Atomic Energy Research Institute)
  • Received : 1999.12.07
  • Accepted : 2000.02.18
  • Published : 2000.05.31
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Abstract

Adsorption characteristics of uranium on activated carbon whose surface is modified with $HNO_3$ and/or NaOH were investigated. Na-OAC, which was the activated carbon treated with both $HNO_3$ and NaOH. showed higher adsorption capacity than OAC, which was treated with $HNO_3$, as well as Na-AC, which was treated with only NaOH. This can be explained based on the surface functional groups increased by surface modification of activated carbon and the change of solution pH as adsorption proceeds. From these experimental results, it is thought that the pH of uranium solution and surface functional groups on the activated carbon surface are the governing factors in the uranium adsorption system.

$HNO_3$ 및 NaOH 용액으로 표면 처리한 활성탄을 이용하여 방사성 액체 폐기물 내에 잔존하는 우라늄의 흡착 특성을 조사하였다. $HNO_3$ 처리후 NaOH로 처리한 활성탄(Na-OAC)은 $HNO_3$만으로 처리한 활성탄(OAC)과 NaOH만으로 처리한 활성탄(Na-AC)에 비해 우수한 우라늄 흡착 성능을 나타내었다. 이와 같은 현상을 활성탄의 표면처리에 의한 표면 관능기 증가 및 용액의 pH 상승에 따른 효과로 설명할 수 있다. 따라서, $HNO_3$ 및 NaOH 용액을 이용하여 표면 처리한 활성탄을 이용한 우라늄 흡착 제거 공정에서는 용액 pH와 표면 처리에 의해 형성된 표면 관능기가 흡착 성능을 좌우하는 중요한 인자임을 알 수 있다.

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