Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Application of Yeongdong Illite to Remove Radiocesium for Severe Nuclear Accidents

원자력 중대 사고에 대비한 영동 지역 일라이트의 방사성 세슘 흡착 특성 평가

  • Hwang, Jeonghwan (Division of Earth and Environmental Research, Korea Basic Science Institute) ;
  • Choung, Sungwook (Division of Earth and Environmental Research, Korea Basic Science Institute) ;
  • Park, Chan-Soo (Division of Earth and Environmental Research, Korea Basic Science Institute) ;
  • Han, Jeong-Hee (Division of Earth and Environmental Research, Korea Basic Science Institute) ;
  • Jeon, Sodam (Division of Earth and Environmental Research, Korea Basic Science Institute)
  • 황정환 (한국기초과학지원연구원 지구환경연구부) ;
  • 정성욱 (한국기초과학지원연구원 지구환경연구부) ;
  • 박찬수 (한국기초과학지원연구원 지구환경연구부) ;
  • 한정희 (한국기초과학지원연구원 지구환경연구부) ;
  • 전소담 (한국기초과학지원연구원 지구환경연구부)
  • Received : 2016.09.20
  • Accepted : 2016.12.02
  • Published : 2016.12.30
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Abstract

This study evaluated potential application of illite, which is produced at Yeongdong area in Korea, to remove radiocesium released to environmental system through severe nuclear accidents. The Yeongdong illite was formed by metamorphose of micaceous schist in hydrothermal condition, and composed of quartz, illite, and albite. Sorption distribution coefficient ($K_d$) of cesium by the Yeongdong illite was higher than the $K_d$ values for other clay minerals. It may be affected by preferential adsorption of cesium to Frayed Edge Sites (FES) on illite. Nonlinear isotherm models were suitable to describe the sorption processes for the Yeongdong illite. Its max. single layer capacity was $250,000{\mu}g\;kg^{-1}$ for cesium. Therefore, the Yeongdong illite could be an efficient and economic sorbent to prevent dispersion of radiocesium, and apply for remediation.

본 연구는 원자력 중대 사고 시, 환경에 유출된 방사성 세슘의 확산을 억제하기 위해 충북 영동지역 일라이트의 활용 가능성을 평가하였다. 영동 일라이트는 운모질 편암의 열수변질 작용에 의해 형성되었으며, 주요 구성 광물은 석영, 장석, 일라이트이다. 저농도 세슘 용액을 사용한 회분식 흡착 실험 결과, 영동 일라이트의 흡착 분배 계수($K_d$)는 약 $4,200L\;kg^{-1}$으로 다른 점토 광물에 비해 비교적 높은 값을 가지며, 이는 일라이트에 존재하는 풍화된 모서리면(FES)의 영향으로 판단된다. 영동 일라이트와 세슘의 흡착등온선은 비선형 흡착 특성을 나타내며 단일 표면 한계 흡착 능력이 $250,000{\mu}g\;kg^{-1}$으로 우수한 흡착능을 보여주어 방사성 세슘 흡착제로서의 사용 가능성을 입증하였다. 이러한 결과는 추후 방사능 누출 사고 등의 긴급 상황 발생 시, 영동 지역 일라이트를 오염 확산 방지 및 정화작업에 사용하기 위한 평가 자료로 활용될 것으로 기대된다.

Keywords

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