청정기술 (Clean Technology)

  • 제23권4호
  • /
  • Pages.413-420
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  • 2017
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  • 1598-9712(pISSN)
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  • 2288-0690(eISSN)
한국청정기술학회 (The Korean Society of Clean Technology)
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석탄비산재로 합성한 제올라이트 X에 의한 수중의 Cs 이온 흡착에 반응표면분석법 적용

Application of Response Surface Methodology (RSM) on Adsorption of Cs Ion in Aqueous Solution with Zeolite X Synthesized from Coal Fly Ash

  • 이창한 (부산가톨릭대학교 환경행정학과) ;
  • 이민규 (부경대학교 화학공학과)
  • Lee, Chang-Han (Department of Environmental Adminstration, Catholic University of Pusan) ;
  • Lee, Min-Gyu (Department of Chemical Engineering, Pukyong National University)
  • 투고 : 2017.04.11
  • 심사 : 2017.05.25
  • 발행 : 2017.12.31
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초록

화력발전소에서 발생되는 석탄비산재로부터 합성한 제올라이트 X를 이용한 Cs 흡착의 회분식 실험 및 반응표면분석법(Response Surface Methodology, RSM)을 적용하여 결과를 분석하였다. Cs 흡착 실험에 적용된 회귀 방정식은 반응변수의 함수로 나타낼 수 있었다. 결정계수($r^2$)가 0.9630으로서 이 모델은 높은 상관성을 가졌다. pH > Cs 농도 > 온도와 같은 실험적 요인의 순서로 Cs의 제거효율에 영향을 준다는 것을 통계적인 결과로부터 확인하였다. 흡착속도는 유사 2차 모델에 의해 보다 정확하게 표현되었다. Langmuir 등온선 모델로부터 계산된 최대 흡착용량은 293 K에서 $151.52mg\;g^{-1}$이었다. 또한, Vant Hoff 식에 의해 계산된 열역학 파라미터에 의거하여 흡착반응이 흡열반응이며, 자발적인 과정임을 확인할 수 있었다.

The batch experiments and response surface methodology (RSM) have been applied to the investigation of the Cs adsorption with zeolite X synthesized using coal fly ash generated from the thermal power plant. Regression equation formulated for Cs adsorption was represented as a function of response variables. The model was highly relevant because the decision coefficient ($r^2$) was 0.9630. It was confirmed from the statistical results that the removal efficiency of Cs was affected by the order of experimental factors as pH > Cs concentration > temperature. The adsorption kinetics were more accurately represented by a pseudo second-order model. The maximum adsorption capacity calculated from the Langmuir isotherm model was $151.52mg\;g^{-1}$ at 293 K. Also, according to the thermodynamic parameters calculated from Vant Hoff equation, it could be confirmed that the adsorption reaction was an endothermic reaction and a spontaneous process.

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