EDTA辅助水热法制备不同形貌的氟化镁钠

以氟化钠、六水合氯化镁为主要原料, EDTA (乙二胺四乙酸二钠盐)为辅助剂, 通过水热法制备出不同形貌的氟化镁钠。考察了溶液pH、反应温度、时间和络合剂对产物形貌和物相的影响, 并对其形成机理进行了探讨。采用扫描电镜(SEM)、X射线衍射(XRD)和傅里叶变换红外光谱(FT-IR)等手段对产物形貌和物相进行了表征。结果表明: 在该反应体系中, EDTA既作为原料提供钠离子, 又作为络合剂与镁离子形成络合物; 反应温度、pH和络合剂对产物的形貌和物相有较大影响; 所得产物结晶度高, 有表面光滑的微米立方体晶体和纳米粒子聚集的微米空心球颗粒, 粒径均在1~3 μm之间。

Sodium Magnesium Fluoride Particles of Different Morphologies: Prepared by EDTA-assisted Hydrothermal Method

Different morphologies of sodium magnesium fluoride particles were prepared by EDTA-assisted hydrothermal method using sodium fluoride, magnesium chloride hexahydrate as main materials and EDTA (ethylenediaminetetraacetic acid disodium salt) as auxiliary agent. Influence of solution pH, reaction temperature, time and complexing agent on the morphology and phase of the products was investigated, and the formation mechanism was discussed. Samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The results show that the EDTA not only provides sodium ions as raw material, but also forms complex with magnesium ions as a complexing agent in the reaction system. Reaction temperature, pH and complexing agent have great influences on the morphologies and phase of the products. The obtained products have microcube crystals with a smooth surface and micron-sized hollow spheres polymerized with nanoparticles. And the products have high crystallinity with crystal dimension ranging from 1 μm to 3 μm.