Synthesis of Porous Basic Magnesium Carbonate Crystallographic Materials with Flower-Like Structure

Abstract:

The porous basic magnesium carbonate (Mg₅(CO₃)₄(OH)₂^.4H₂O) crystal crystallographic materials with flower-like structure were prepared successfully by homogeneous precipitation method. Magnesium chloride hexahydrate (MgCl₂^.6H₂O) and urea (CO(NH₂)₂) were used as reaction materials. The experimental equipment was held at 100°C for 8 h. Phase and morphology of the product were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The formation mechanism of the product was investigated. It was found that the CO₂ bubbles acted as porous templates. The growth and gathering of the CO₂ bubbles induced the growth of the MgCO₃^.3H₂O columnar crystals. Then the dissolution of the MgCO₃^.3H₂O and the deposition of Mg₅(CO₃)₄(OH)₂^.4H₂O happened simultaneously. Finally the disappearance of MgCO₃^.3H₂O brought about the formation of the porous structure.

• Periodical: Key Engineering Materials (Volume 723)
• Pages: 444-449
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.723.444
• Online since: December 2016
• Authors: Juan Chen, Zhi Liang Huang*, Wen Zhao Li
• Keywords: Basic Magnesium Carbonate, Crystallographic Materials, Homogeneous Precipitation Method, Porous

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