Synthesis of CeO2 nanoparticles by azeotropic distillation processing

摘要

CeO2 nanoparticles were synthesized by precipitation method. The azeotropic distillation technique was carried out to dehydrate hydrous gels and ensure complete elimination of the residual water in the precursors. The effects of seven different alcohols (ethanol, n-propyl alcohol, isopropanol, n-butyl alcohol, isobutanol, secondary butyl alcohol, tert-butyl alcohol) as entrainer were compared with each other. DSC (different scanning calorimetry) /TG (thermalgravimetric), FI-IR (Infra-red spectrum analysis), XRD (X-ray diffraction) and TEM (transmission electron spectroscopy) were performed to characterize the structures and properties of CeO2 nanoparticles. Among seven alcahols, n-butyl alcohol has the best effect during azeotropic distillation. After azeotropic distillation with n-butyl alcohol, particles with well dispersity and an average size of 10～20nm were obtained. The azeotropic distillation processing was proved to be quite effective in reduced the possibility of the formation of chemical bonds and prevented the formation of hard agglomerates.