【摘要】 通过共沉淀法,研究了Mg(NO3)2.6H2O和K2CO3生成水合碳酸镁的形貌和组成随反应初始溶液搅拌时间的变化规律。结果发现,当反应初始溶液的搅拌时间在1~8 min变化时,可使产物针状水合碳酸镁的直径控制在0.5~23μm,长度介于2~200μm;通过对产物组成的红外光谱和热重分析,发现当搅拌时间在1~20 min变化时,所得产物MgCO3.xH2O(1<x<3)中的水分含量也随之发生较大变化。更多还原

【Abstract】 Magnesium carbonate hydrates were facilely synthesized by the precipitation of Mg(NO3)2·6H2O and K2CO3in aqueous solutions,and their morphologies and compositions were characterized by SEM,FTIR spectroscopy and TGA.SEM observation demonstrates that the needlelike magnesium carbonate hydrates with variable sizes,ranging from 0.5 to 23 μm in diameter and 2 to 200 μm in length,can be synthesized by adjusting carefully the stirring time of the initial reaction solution in the range of 1～8 min.IR and TG analyses indicate that the stirring time has a significant effect on the content of water of magnesium carbonate hydrates besides their morphologies,and the corresponding composition has a simple formula of MgCO3·xH2O,in which the value of x is between 1～3 with the variety of stirring time from 1 to 20 min.更多还原