三水碳酸镁焙烧法制备纳米多孔中空棒状氧化镁研究

Preparation of Nanoporous Hollow Rod—shaped Magnesium Oxide by Magnesium Carbonate Trihydrate Roasting Method

    摘要
  • 摘要: 以MgCl2·6H2O为原料、（NH4）2CO3为沉淀剂，采用液相沉淀法制备前驱体MgCO3·3H2O，并焙烧前驱体制备获得具有纤维结构的氧化镁。主要探讨沉淀剂浓度、反应温度、焙烧温度和焙烧时间对产物的平均粒径和物相组成的影响，并探究其形成机理。结果表明：沉淀剂浓度为1.5 mol/L、反应温度40 ℃、焙烧温度600 ℃、焙烧时间120 min时，可获得纳米中空棒状氧化镁，其表面由片状物相互连接形成多孔结构，前驱体三水碳酸镁在高温焙烧过程中起到模板作用。

     

    Abstract: The precursor MgCO3·3H2O was prepared by liquid phase precipitation using MgCl2·6H2O as raw material and (NH4)2CO3 as precipitant,, and magnesium oxide with fiber structure was prepared by roasting the precursor. The effects of precipitant concentration, reaction temperature, roasting temperature and roasting time on the average particle size and phase composition of the product were mainly discussed, and the formation mechanism was explored. The results showed that when the concentration of precipitant was 1.5 mol/L, the reaction temperature was 40 ℃, the roasting temperature was 600 ℃, and the roasting time was 120 min, the nano−hollow rod−like magnesium oxide could be obtained, and the surface of which was connected by flakes to form a porous structure, and the precursor magnesium carbonate trihydrate played a template role in the high-temperature roasting process.

     

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