水热均匀沉淀法制备不同粒径的纳米氧化镁

Preparation of Nano-MgO With Different Particle Sizes by Hydrothermal Homogeneous Precipitation

纳米氧化镁(nano-MgO)在陶瓷、水处理、催化和材料等领域有着十分广泛的应用,不同粒径的nano-MgO具有不同的特性和应用范围。以MgCl2为镁源,尿素为沉淀剂,聚乙二醇为分散剂,首次采用水热均匀沉淀法研究了nano-MgO的制备,考察了反应物浓度、反应物配比、反应温度和焙烧温度对nano-MgO粒径的影响;根据这些影响规律,制备出了不同粒径的nano-MgO,并对其纯度、粒径、晶体结构和形貌进行了表征。研究结果表明:采用水热均匀沉淀法,通过控制制备条件,可以制备出不同粒径的nano-MgO粉体;制备条件对nano-MgO粒径有显著的影响,反应温度和焙烧温度升高,nano-MgO的粒径增大;增大反应物浓度,nano-MgO粒径先增大后减小;MgCl2与尿素的配比增大,nano-MgO的粒径先减小后增大。这些实验结果为纳米氧化镁的制备、研究和应用提供了重要的参考。

Nano-MgO has been widely used in ceramics,water treatment,catalysis,materials and other fields.Nano-MgO with different particle sizes has different characteristics and application ranges.In this paper,the preparation of nano-MgO was studied for the first time by hydrothermal homogeneous precipitation method with MgCl2 as the source of magnesium,urea as the precipitant and polyethylene glycol as the dispersant.The effects of reactant concentration,reactant ratio,reaction temperature,and calcination temperature on particle size of nano-MgO were investigated.According to these influence rules,nano-MgO with different particle sizes were prepared,and their purity,particle sizes and crystal structure and morphology were characterized.The results show that nano-MgO powders with different particle sizes can be prepared by hydrothermal homogeneous precipitation method.The preparation conditions have a significant effect on the particle size of nano-MgO.With the increase of reaction temperature and calcination temperature,the particle size of nano-MgO increases,with the increase of reactant concentration,the particle size of nano-MgO increases first and then decreases,the particle size of nano-MgO decreased first and then increased with the increase of urea ratio.These experimental results can provide important references for the preparation,researches and applications of nano-MgO.