Morphology and size control of 513 MHSH, Mg(OH)₂ from sea bittern using H₂SO₄ and NH₄OH
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513 MHSH (Magnesium Hydroxide Sulfate Hydrate) and Mg(OH)2 were synthesized using a domestic resource, sea bittern,as a Mg precursor instead of conventional reagents. Sea bittern contains a large amount of Ca2+ ions, which can be efficientlyremoved using sulfuric acid. We synthesized them using the obtained MgSO4 solution from sea bittern. By adding ammoniato the MgSO4 solution to synthesize plate-like Mg(OH)2 and adjusting the Mg(OH)2/MgSO4 ratio by adjusting the amountof ammonia, needle-like 513 MHSH were synthesized. In addition, the synthesized hexagonal plate-like Mg(OH)2 was grownto a size of 50 to 400 nm by hydrothermal reaction. The conditions for synthesizing the needle-like 513 MHSH were foundby the addition of sulfuric acid. The synthesized 513 MHSH and Mg(OH)2 were characterized by X-ray Diffraction (XRD),Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM).
Abstract
513 MHSH (Magnesium Hydroxide Sulfate Hydrate) and Mg(OH)2 were synthesized using a domestic resource, sea bittern,as a Mg precursor instead of conventional reagents. Sea bittern contains a large amount of Ca2+ ions, which can be efficientlyremoved using sulfuric acid. We synthesized them using the obtained MgSO4 solution from sea bittern. By adding ammoniato the MgSO4 solution to synthesize plate-like Mg(OH)2 and adjusting the Mg(OH)2/MgSO4 ratio by adjusting the amountof ammonia, needle-like 513 MHSH were synthesized. In addition, the synthesized hexagonal plate-like Mg(OH)2 was grownto a size of 50 to 400 nm by hydrothermal reaction. The conditions for synthesizing the needle-like 513 MHSH were foundby the addition of sulfuric acid. The synthesized 513 MHSH and Mg(OH)2 were characterized by X-ray Diffraction (XRD),Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM).