Coupling of Antisolvent Crystallization with Reduction Thermal Decomposition Method to Prepare Cubic Magnesium Oxide
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摘要: 立方形氧化镁粉体在抗菌和催化材料领域已显现出巨大的应用前景，因此制备性能优良的氧化镁粉体具有重要意义。本文采用反溶剂析出法结合还原热解法制备了近纳米级立方形氧化镁粉体，通过采用无水乙醇和不同初始浓度的硫酸镁水溶液制备前驱体粉体，进一步将其与不同质量分数的炭粉混合在800 ℃进行还原热分解反应，从而得到立方形氧化镁粉体。实验表明，随着初始浓度的降低，前驱体的颗粒尺寸减小，微观形貌越接近球形；在还原热解过程中，前驱体颗粒尺寸越小，形貌越近球形，炭粉添加量越高，氧化镁的转化率越高。通过实验结果可知当采用0.1 mol/L的原始溶液和2:1的配炭比时可成功制备出纯度较高的立方形氧化镁粉体。Abstract: Owing to the promising application prospect of cubic magnesium oxide powders, the synthesis of magnesium oxide powders with excellent performance has great significance. This study prepared approximate nano-scale cubic magnesium oxide powders by coupling antisolvent crystallization with the reduction thermal decomposition method. The precursors were prepared with ethanol and different initial concentrations of magnesium sulfate aqueous, then the precursors were mixed with varying ratios of the weight of carbon powder to perform the reduction thermal decomposition process at 800 ℃. The results show that the particle size of precursors decreased and the microstructure of precursors became more spherical with the decreasing initial concentration of magnesium sulfate aqueous. In the reduction thermal decomposition process, the conversion rate of magnesium oxide was strongly dependent on the particle size of precursors and the additive amount of carbon powder. The conversion rate of magnesium oxide increased with the decreasing particle size of the precursor and the increasing additive amount of carbon powders. The experimental results indicate that the relatively pure cubic magnesium oxide powders could be prepared when 0.1 mol/L initial solution and the carbon mass ratio of 2 were used.
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Keywords:
- Anti-solvent /
- reduction /
- magnesium oxide /
- carbon powder /
- ethanol
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