摘要
为了制备长径比较大的碱式硫酸镁晶须,以七水硫酸镁和氢氧化钠为原料,在水热条件下,考察水热物料摩尔比、温度、时间、搅拌强度、物料浓度等因素对晶须生长的影响。通过红外光谱仪(FT-IR)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)等对产物进行表征。单因素实验研究得到其水热合成优化工艺条件为:氢氧化钠与硫酸镁的摩尔比为0.3,水热合成温度为160~180℃,加热恒温时间为4 h,料浆搅拌强度为300 r/min,每100 m L水介质中加入七水硫酸镁和氢氧化钠总质量为10 g,陈化时间为12 h。分析结果表明,在该水热条件下制备的须状产品的组成为Mg SO4·5Mg(OH)2·3H2O,晶须颗粒长度均匀,直径在50 nm^1μm之间,长径比在100~150之间。
In order to prepare the basic magnesium sulfate whisker with large aspect ratio,using the magnesium sulfate heptahydrate and sodium hydroxide as raw materials,the effects of preparation parameters on the growth of whisker are studied,including molar ratio of magnesium sulfate heptahydrate and sodium hydroxide,temperature,time,stirring intensity and the concentration of magnesium sulfate heptahydrate and sodium hydroxide. The resultant product is characterized by Infrared spectroscopy（FT-IR）,X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The optimal hydrothermal synthesis conditions are as follows： 0. 3 of the molar ratio of sodium hydroxide and magnesium sulfate,160-180℃ of hydrothermal synthesis temperature,4 hours of hydrothermal time,300 r/min of the stirring intensity of slurry,10 g of total mass of magnesium sulfate heptahydrate and sodium hydroxide per 100 m L of water,12 hours of aging time. The results show that the composition of the obtained whisker is Mg SO4·5Mg（OH）2·3H2O. The length of whisker is uniform. The diameter of whisker is between 50 nm-1 μm. The aspect ratio of whisker is between100 and 150.
出处
《现代化工》
CAS
CSCD
北大核心
2017年第2期133-136,共4页
Modern Chemical Industry
基金
国家自然科学基金资助项目(21076131)
四川省科技支撑计划(2014GZ0076)
重庆三峡学院人才引进项目(20151115)
关键词
碱式硫酸镁
水热法
制备
basic magnesium sulfate
hydrothermal method
preparation
