Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Comparison of Cs and Sr Ion Adsorption Capacities with Crystallinity of Zeolitic Materials Synthesized from Coal Fly Ash under Low-Alkaline Conditions

석탄 비산재로부터 저알칼리 조건에서 합성된 제올라이트 물질의 결정화도에 따른 Cs 및 Sr 이온의 흡착 용량 비교

  • Choi, Jeong-Hak (Department of Environmental Engineering, Catholic University of Pusan) ;
  • Lee, Chang-Han (Department of Environmental Administration, Catholic University of Pusan)
  • 최정학 (부산가톨릭대학교 환경공학과) ;
  • 이창한 (부산가톨릭대학교 환경행정학과)
  • Received : 2022.01.19
  • Accepted : 2022.02.10
  • Published : 2022.02.28
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Abstract

Zeolitic material, Z-Y3, was synthesized from coal fly ash (CFA) under low-alkaline conditions (NaOH/CFA ratio = 0.3 and NaOH solution concentrations of 0.0, 0.5, and 1.0 M) using a fusion/hydrothermal method. The adsorption capacities of the fabricated Z-Y3 samples for Cs and Sr ions and the desorption capacity of Na ions were evaluated. The XRD patterns of the Z-Y3 sample fabricated using a 1.0 M NaOH solution (Z-Y3 (1.0 M)) indicated the successful synthesis of a zeolitic material, because the diffraction peaks of Z-Y3 coincided with those of the Na-A zeolite in the 2θ range of 7.18-34.18. Moreover, the SEM images revealed that morphology of the Z-Y3 (1.0 M) sample, which presented zeolitic materials characteristics, consisted of sharp-edged cubes. The adsorption isotherms of Cs and Sr ions on all the fabricated Z-Y3 samples were described using the Langmuir model, and the maximum adsorption capacities of Cs and Sr were calculated to be 0.14-0.94 mmol/g and 0.19-0.78 mmol/g, respectively. The desorption of Na ions from the Cs and Sr ions adsorbed Z-Y3 samples followed the Langmuir desorption model. The maximum desorption capacities of Na ions from the Cs and Sr ions adsorbed Z-Y3 (1.0 M) samples were 1.28 and 1.49 mmol/g, respectively.

Keywords

Acknowledgement

본 논문은 2021년도 부산가톨릭대학교 교내학술연구비 및 2017년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업(2017R1D1A1B03030350) 지원에 의하여 수행되었습니다.

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