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abstract
A microwave-enhanced precipitation method was employed to prepare nano-sized MgO particles using MgCl2·6H2O as precursor, deionized water as solvent, and ammonia solution as the precipitating agent. The influence of the concentration of MgCl2 solution, pH value, irradiation time, calcination temperature and methods on particle sizes and physico-chemical features of MgO were studied, and the optimal technical conditions were obtained. For comparison, MgO nanoparticles were also synthesized without microwave irradiation. The structure and morphology of the MgO particles were analyzed by XRD, SEM, and DTA-TG. The results show that the nanometer MgO prepared under the optimal technical conditions has regular morphology and uniform size distribution. The sample calcined at 773 K had an average particle size about 10 nm. Both SEM and XRD characterization showed the formation of smaller particles after microwave irradiation.