Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Evaluation of Exchange Capacities of Ca2+ and Mg2+ ions by Na-A Zeolite Synthesized from Coal Fly Ash

석탄비산재로 합성한 Na-A 제올라이트의 Ca2+와 Mg2+ 이온교환 성능평가

  • Lee, Chang-Han (Department of Environmental Adminstration, Catholic University of Pusan) ;
  • Lee, Min-Gyu (Department of Chemical Engineering, Pukyong National University)
  • 이창한 (부산가톨릭대학교 환경행정학과) ;
  • 이민규 (부경대학교 화학공학과)
  • Received : 2018.06.26
  • Accepted : 2018.08.16
  • Published : 2018.11.30
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Abstract

In this study, zeolite (Z-C1) was synthesized using a fusion/hydrothermal method from coal fly ash. The morphological structures of Z-C1 were confirmed to be highly crystalline with a cubic crystal structure. Exchange capacities of $Ca^{2+}$ and $Mg^{2+}$ ions in a single and a mixed solution reached equilibrium within 120 min. The exchange kinetics of these ions were well predicted by the pseudo-second-order rate equation. The exchange isotherms of the $Ca^{2+}$ and $Mg^{2+}$ ions matched the Langmuir isotherm better than the Freundlich isotherm. The maximum cation exchange capacities ($q_m$) obtained by the Langmuir isotherm model were 2.11 mmol/g (84.52 mg/L) and 1.13 mmol/g (27.39 mg/L) for the $Ca^{2+}$ and $Mg^{2+}$ ions, respectively.

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References

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