Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Kinetics and Isotherm Analysis of Valuable Metal Ion Adsorption by Zeolite Synthesized from Coal Fly Ash

석탄비산재로부터 합성한 제올라이트를 이용한 유가금속이온의 흡착속도 및 등온 해석

  • Ahn, Kab-Hwan (Department of Environmental Adminstration, Catholic University of Pusan) ;
  • Lee, Chang-Han (Department of Environmental Adminstration, Catholic University of Pusan) ;
  • Lee, Min-Gyu (Department of Chemical Engineering, Pukyong National University)
  • 안갑환 (부산가톨릭대학교 환경행정학과) ;
  • 이창한 (부산가톨릭대학교 환경행정학과) ;
  • 이민규 (부경대학교 화학공학과)
  • Received : 2017.12.05
  • Accepted : 2018.01.09
  • Published : 2018.02.28
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Abstract

In this study, zeolite (Z-C2) was synthesized using a fusion/hydrothermal method on coal fly ash (FA) discharged from a thermal power plant in the Ulsan area and then analyzed via scanning electron microscopy (SEM) and X-ray diffraction (XRD). The Z-C2 was characterized in terms of mineralogical composition and morphological analysis. The XRD results showed that its peaks had the characteristics of Na-A zeolite in the range of $2{\theta}$ of 7.18~34.18. The SEM images confirmed that the Na-A zeolite crystals had a chamfered-edge crystal structure almost identical to that of the commercial zeolite. The adsorption kinetics of Cu, Co, Mn and Zn ions by Z-C2 were described better by the pseudo-second-order kinetic model more than by the pseudo-first-order kinetic model. The Langmuir model fitted the adsorption isotherm data better than the Freundlich model did. The maximum adsorption capacities of Cu, Co, Mn and Zn ions obtained from the Langmuir model were in the following order : Cu (94.7 mg/g) > Co (77.7 mg/g) > Mn (57.6 mg/g) > Zn (51.1 mg/g). These adsorption capacities are regarded as excellent compared to those of commercial zeolite.

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References

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