Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Characterization of Natural Zeolite for Removal of Radioactive Nuclides

방사성 핵종 제거를 위한 천연 제올라이트 특성 연구

  • Kim, Hu Sik (Department of Applied Chemistry, Andong National University) ;
  • Park, Won Kwang (Department of Applied Chemistry, Andong National University) ;
  • Lee, Ha Young (Department of Applied Chemistry, Andong National University) ;
  • Park, Jong Sam (Department of Radiologic Technology, Daegu Health College) ;
  • Lim, Woo Taik (Department of Applied Chemistry, Andong National University)
  • Received : 2014.02.12
  • Accepted : 2014.03.21
  • Published : 2014.03.31
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Abstract

The four natural zeolites collected in Pohang and Gyeongju area, Kyungsangbuk-do, Korea, were characterized by XRD, XRF, DTA, TGA, and CEC analysis. The primary species of these zeolite are heulandite, modenite, illite, and illite in Kuryongpo (Ku), Pohang (Po), Yangbuk-A (Ya-A), and Yangbuk-B (Ya-B) samples. The XRF analysis showed that the four zeolites contain Si, Al, Na, K, Mg, Ca, and Fe. Cation exchange capacity of Kuryongpo (Ku) zeolite was the highest compared to other zeolites. The adsorption capacities of Cs and Sr in the four natural zeolites were compared at $25^{\circ}C$. On the basis of adsorption data Langmuir and Freundlich adsorption isotherm model were confirmed. The equilibrium process was descried well by Langmuir isotherm model. This study shows that Ya-A zeolite is the most efficient for the $Cs^+$ and $Sr^{2+}$ ion adsorption compared to the other natural zeolites.

국내 경상북도 포항 및 경주지역에서 채취한 4종의 천연 제올라이트를 X-선 회절, X-선 형광분석, 열시차 분석, 열중량 분석 및 양이온교환능 분석을 통해 특성분석을 수행하였다. 이들 제올라이트의 주성분은 구룡포(Ku)는 휼란다이트, 포항(Po)은 클라이놉틸로라이트와 석영이 혼합된 모데나이트이며 양북A (Ya-A)는 휼란다이트, 클라이놉틸로라이트 및 석영이 함유된 일라이트이며, 양북B (Ya-B)는 휼란다이트와 클라이놉틸로라이트가 혼합된 일라이트이다. 4종의 제올라이트는 Si, Al, Na, K, Mg, Ca, Fe을 함유하고 있었다. 구룡포 (Ku) 제올라이트의 양이온 교환능이 다른 지역의 제올라이트 보다 높게 나타났다. Cs 및 Sr의 흡착실험은 $25^{\circ}C$에서 수행하였으며, 흡착자료를 기초로 Langmuir와 Freundlich 흡착등온식에 대한 적합성을 평가하였다. 흡착공정은 Langmuir 흡착 등온식이 잘 맞았으며, 양북 A 제올라이트가 다른 제올라이트 보다 $Cs^+$ 및 $Sr^{2+}$ 이온의 제거에 가장 효과적임을 보여주었다.

Keywords

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