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Effects of Temperature on The Crystallization and Structural Stability of Struvite (MgNH4PO4·6H2O)

스트루바이트(MgNH4PO4·6H2O)의 결정화 및 구조 안정성에 미치는 온도 효과

  • Lee, Seon Yong (Department of Earth and Environmental Sciences, Korea University) ;
  • Chang, Bongsu (Department of Earth and Environmental Sciences, Korea University) ;
  • Kng, Sue A (Department of Earth and Environmental Sciences, Korea University) ;
  • Lee, Young Jae (Department of Earth and Environmental Sciences, Korea University)
  • 이선용 (고려대학교 지구환경과학과) ;
  • 장봉수 (고려대학교 지구환경과학과) ;
  • 강수아 (고려대학교 지구환경과학과) ;
  • 이영재 (고려대학교 지구환경과학과)
  • Received : 2020.02.27
  • Accepted : 2020.03.17
  • Published : 2020.03.31

Abstract

A series of struvite (MgNH4PO4·6H2O) was synthesized and dried at various temperatures (15-60℃). Crystallization of struvite and its structural properties were significantly influenced by synthetic and drying temperature. Struvite was favorably formed at synthetic temperatures ≤30℃ with an inverse relationship between the crystallinity and synthetic temperature. The crystallinity of struvite was also significantly reduced by an increase in drying temperature from 45℃ to 60℃ due to the loss of structural water molecules and ammonium ions by the facilitated thermal decomposition. However, struvite formed at lower synthetic temperature showed higher crystallinity, and its amorphization by thermal decomposition was inhibited. These results demonstrate that struvite formed at low temperature with an stable condition thermodynamically through favorable crystallization shows high crystallinity and stability with respect to the structural and thermal resistance.

다양한 온도에서 스트루바이트(struvite, MgNH4PO4·6H2O)들이 합성 및 건조되었다. 스트루바이트의 결정화와 그 구조적 특성은 합성 온도와 건조 온도 모두에게 큰 영향을 받았다. 스트루바이트는 합성 온도 ≤30℃에서 순조롭게 형성되었으며, 결정도는 합성 온도와 역의 관계를 보였다. 또한, 스트루바이트 결정도는 건조 온도가 45℃에서 60℃로 증가함에 따라 감소되었으며, 이는 열분해로 인해 발생한 구조적 물 분자와 암모늄 이온의 손실로 촉진되었다. 그러나 낮은 합성 온도에서 합성된 스트루바이트 일수록 높은 결정도를 가지며, 열분해에 의한 비정질화가 억제되었다. 본 결과는 저온의 열역학적으로 안정한 조건에서 형성된 스트루바이트는 높은 결정성을 보이며, 이에 따른 구조 안정성과 열저항성을 갖음을 입증한다.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea, Korea Environment Industry & Technology Institute

This work was supported by a National Research Foundation of Korea grant funded by the Korea government (No. 2017R1A2B4008454), a Korea Environment Industry & Technology Institute though Underground environmental pollution risk management technology development business Program, funded by Korea Ministry of Environment (No. 2018002470002), and by a Korea University Grant.

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