氨沉淀法一步水热合成碱式硫酸镁晶须研究

Hydrothermal synthesis of magnesium hydroxide sulfate hydrate whiskers by one-step procedure with ammonia as precipitant

采用氨作为沉淀剂一步法水热合成碱式硫酸镁（MHSH）晶须,利用扫描电子显微镜（SEM）、X射线衍射分析仪（XRD）、差热-热重分析仪（TG-DTG）对产品进行了表征。在硫酸镁溶液浓度2mol/L、NMgSO4∶NNH3=1∶0.5、反应温度为120℃、反应时间2h、搅拌强度200r/min的条件下合成的碱式硫酸镁晶须化学式为MgSO4·5Mg（OH）2·2H2O,平均直径为0.2-0.3μm,长径比30以上,晶须表面光滑,纤细均匀且无弯曲。

Magnesium hydroxide sulfate hydrate（MHSH）whiskers were prepared in one-step by method of hydrothermal synthesis with NH3 as precipitant.Scanning electron microscopy（SEM）,X-ray diffraction analyzer（XRD）,Thermal analysis（TG-DTG）were employed to characterize the products.The results showed that when concentration of MgSO4 was2mol/L,NMgSO4∶NNH3=1∶0.5,reaction temperature was 120℃,reaction time was 2hand the stir intensity was 200r/min,MgSO4·5Mg（OH）2·2H2O（MHSH）whiskers with smooth surface were obtained.The surface of products was smooth,uniform and without bending with 0.2-0.3μm in length and more than 30 in slenderness ratio.