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

Abstract

A series of struvite (MgNH4PO4·6H2O) was synthesized and dried at various temperatures (15-60oC). Crystallization of struvite and its structural properties were significantly influenced by synthetic anddrying temperature. Struvite was favorably formed at synthetic temperatures 30oC with an inverse relationship between the crystallinity and synthetic temperature. The crystallinity of struvite was alsosignificantly reduced by an increase in drying temperature from 45oC to 60oC 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.