水热条件下反应介质对Mg(OH)2晶体晶形的影响

以氯化镁和氨水为原料,在室温下制得Mg(OH)2,在不同的反应介质中对Mg(OH)2进行水热处理,制备出了超细、高纯的Mg(OH)2颗粒,利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对所制得Mg(OH)2颗粒的晶相、形貌和颗粒尺寸进行了表征.研究结果表明,水热条件下反应介质对Mg(OH)2晶体的形成有十分显著的影响,NaOH溶液、乙二胺和乙醇溶液能够显著改善Mg(OH)2晶体的晶形和分散性.初步探讨了水热条件下反应介质对Mg(OH)2晶形的影响机制.

Influence of Reaction Media on Morphology of Mg(OH)2 Crystals Under Hydrothermal Condition

Mg(OH)2 colloid was precipitated at room temperature using MgCl2 and NH3·H2O as precursors. Then, the superfine high-purity Mg(OH)2 particles were obtained by hydrothermal treatment of Mg(OH)2 precipitate in different reaction media. The crystal phase, morphology and particles size of the Mg(OH)2 particles obtained were characterized with XRD and SEM. The results indicated that different reaction media play an important role in the formation of Mg(OH)2 crystals, and the NaOH solution, ethylenediamine or ethanol solution can significantly improve the crystal morphology and dispersion of Mg(OH)2 crystals. The influence of reaction media on the morphology of Mg(OH)2 crystals under hydrothermal conditions was discussed preliminarily.