Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Characterization of CaCO3 Formation Using an Ion Selective Electrode : Effects of the Mg/Ca Ratio and Temperature

이온 선택성 전극을 이용한 탄산칼슘 형성 특성 연구 : 마그네슘-칼슘 비율과 반응 온도의 영향

  • Misong Han (Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Byoung-Young Choi (Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Seung-Woo, Lee (Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Jinyoung Park (Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Soochun Chae (Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Jun-Hwan Bang (Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kyungsun Song (Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources)
  • 한미송 (한국지질자원연구원 기후변화대응연구본부) ;
  • 최병영 (한국지질자원연구원 기후변화대응연구본부) ;
  • 이승우 (한국지질자원연구원 기후변화대응연구본부) ;
  • 박진영 (한국지질자원연구원 기후변화대응연구본부) ;
  • 채수천 (한국지질자원연구원 기후변화대응연구본부) ;
  • 방준환 (한국지질자원연구원 기후변화대응연구본부) ;
  • 송경선 (한국지질자원연구원 기후변화대응연구본부)
  • Received : 2023.01.02
  • Accepted : 2023.02.03
  • Published : 2023.04.10
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Abstract

The nucleation mechanism was studied using a calcium ion selective electrode (Ca ISE) to observe the formation of CaCO3, a representative mineral in the CO2 cycle, and to analyze the effect of the Mg/Ca-ratio and temperature on the formation of pre-nucleation cluster (PNC) and CaCO3. As a result of the experiment, a small amount of crystal was formed. Energy dispersive X-ray spectroscopy (EDS) was used for surface element analysis, and a field emission scanning-electron microscope (FE-SEM) was used for the morphology analysis of synthesized carbonates. These results showed that various shapes of crystalline CaCO3 (calcite, aragonite, etc.) were observed for each Mg/Ca ratio and temperature. In addition, the calibration plot obtained from Ca ISE showed information on the formation process of CaCO3. Our results showed that as magnesium ions interfered with the binding of calcium and carbonate ions and delayed the aggregation between PNCs, the nucleation and formation of CaCO3 were delayed. On the other hand, the temperature showed an opposite trend as compared to the effect of magnesium under our experimental conditions, indicating that temperature accelerated the formation of CaCO3. Furthermore, the morphology of CaCO3 clearly changed according to the Mg/Ca ratio and temperature, and it was confirmed that the two factors are very important for CaCO3 formation in that they could affect the overall process.

이산화탄소 순환 물질 중 대표적인 광물인 탄산칼슘의 형성 과정을 관찰하고, 대표적 조절 변수인 마그네슘-칼슘 이온의 혼합 비율(Mg/Ca 비)과 온도가 pre-nucleation cluster (PNC) 및 탄산칼슘 형성에 미치는 영향을 분석하고자 실험과정에서 칼슘 이온 선택성 전극(calcium ion selective electrode, Ca ISE)을 이용하여 핵형성 과정을 연구하였다. 실험결과 미량의 결정이 형성되었으며 표면 원소 분석을 위해 에너지 분산 X선 분석법(energy dispersive X-ray spectroscopy, EDS)을 사용하였고, 형상 분석을 위해 주사 전자 현미경(field emission scanning electron microscope, FE-SEM)을 사용하였다. Mg/Ca 비와 온도 조건에 따라 다양한 형상의 결정질 탄산칼슘(방해석, 아라고나이트 등)을 확인하였으며 Ca ISE로부터 얻은 칼슘 이온 농도 그래프는 탄산칼슘 형성 과정을 보여주었다. 칼슘 이온 농도 그래프 분석을 통해 마그네슘 이온은 칼슘 이온과 탄산 이온의 결합을 방해하고 PNC 간 응집을 지연시켜 핵형성 및 탄산칼슘의 형성을 지연시킴을 확인하였다. 반면 온도는 이와 반대되는 효과를 보였으며, 본 실험 조건에서는 마그네슘 이온보다 더 큰 영향을 미쳤다. 또한 Mg/Ca 비와 온도에 따라 탄산칼슘의 형상이 뚜렷하게 변화하여 두 인자는 탄산칼슘 형성 과정에 전반적으로 영향을 미치는 중요 조절 변수임을 확인하였다.

Keywords

Acknowledgement

본 연구는 2022년 과학기술정보통신부 주요 사업인 "핵생성 이전단계 연구를 포함한 탄산염광물의 생성 반응경로 규명"의 연구지원으로 수행되었습니다.

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