공업화학 (Applied Chemistry for Engineering)

  • 제34권4호
  • /
  • Pages.412-420
  • /
  • 2023
  • /
  • 1225-0112(pISSN)
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  • 2288-4505(eISSN)
한국공업화학회 (The Korean Society of Industrial and Engineering Chemistry)
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Red mud/fly ash 기반 geopolymer 흡착제의 소성온도에 따른 특성 및 흡착거동

Characterization and Adsorption Properties of Red Mud/Fly Ash Based Geopolymers Adsorbent with Calcination Temperature

  • 신진영 (전남대학교 공학대학 화공생명공학과) ;
  • 김한성 (전남대학교 공학대학 화공생명공학과) ;
  • 강화영 (한영대학교 화공산업공학과) ;
  • 윤순도 (전남대학교 공학대학 화공생명공학과)
  • Jin-Yeong Shin (Department of Biomolecular and Chemical Engineering, Chonnam National University) ;
  • Han-Seong Kim (Department of Biomolecular and Chemical Engineering, Chonnam National University) ;
  • Hwa-Yeong Kang (Department of Chemical and Industrial Engineering, Hanyeong University) ;
  • Soon-Do Yoon (Department of Biomolecular and Chemical Engineering, Chonnam National University)
  • 투고 : 2023.06.07
  • 심사 : 2023.06.29
  • 발행 : 2023.08.10
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초록

본 연구는 red mud와 fly ash 기반 geopolymer 흡착제(RFGPA)를 소성 온도 변화(200, 400, 600 ℃)에 따라 제조하고 소성 온도가 methylene blue (MB)의 흡착에 미치는 영향을 조사하였다. 또한, X-ray fluorescence (XRF), scanning electron microscopy (SEM), X-ray diffraction (XRD), fourier-transform infrared spectroscopy (FT-IR), 및 Brunauer-Emmett-Teller (BET) 분석을 통해 제조한 RFGPA의 특성을 조사하였다. MB를 이용한 소성 온도에 따른 RFGPA의 흡착 kinetics 결과 약 72시간에 MB 흡착 평형에 도달하였고, 흡착 isotherm 결과 MB 농도가 증가함에 따라 흡착 정도가 증가하는 경향을 보였다. 또한, RFGPA에 대해 소성 온도가 증가할수록 MB 흡착량이 감소하는 것을 확인하였다. RFGPA의 MB 흡착메커니즘을 확인하기 위해 수학적 모델식에 적용한 결과 상대적으로 Freundlich와 Sips 모델이 Langmuir 모델 보다 더 적합한 것을 확인하였다. 제조한 RFGPA 내에 존재하는 Fe2O3에 대한 MB의 광분해 효과를 확인하기 위해 dark condition 및 visible condition에서 MB 분해 정도를 분석한 결과 visible condition에서 분해속도가 dark condition보다 약 3배 빠른 것을 확인하였다.

In this study, red mud/fly ash based geopolymer adsorbents (RFGPA) were prepared with calcination temperatures of 200, 400, and 600 ℃, and the effects of these calcination temperatures on the adsorption of methylene blue (MB) were investigated. In addition, the prepared RFGPA was characterized using X-ray fluorescence (XRF), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) spectroscopy, and Brunauer-EmmettTeller (BET) analysis. The results of the adsorption kinetics of MB at RFGPA prepared calcination temperatures indicated that the adsorption equilibrium of MB was reached after about 72 h. From the results of the adsorption isotherm, we verified that the degree of adsorption increased with increasing MB concentrations. In addition, the adsorption amount (Q) of MB decreased with an increase in calcination temperature. The experimental adsorption isotherm data were well fitted to the Freundlich and Sips equations compared to the Langmuir equation. In order to verify the effects of photocatalytic decomposition (C/C0) of MB on Fe2O3 present in prepared RFGPA, the degree of decomposition of MB was examined under dark and visible conditions. Results indicated that the decomposition of MB in visible conditions was about 3.0 times faster than that in dark conditions.

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과제정보

이 논문은 2019년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업(Grant No. NRF- 2019R1I1A3A01061508)에 의해 수행하였음.

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