The results show that the cerium oxide spherical nanoparticles built from primary nanoparticles with the average size of ~5 nm, exhibited dispersion and uniform size and shapes with their average particle diameter of ~50 nm in size. With such a good morphology, CeO2 material possessed good catalytic activity for the decomposition of methylene blue (MB), in which the material was synthesized at a hydrothermal temperature of 80 oC (CeO2-80) for the best MB decomposition performance. | VNU Journal of Science Mathematics Physics Vol. 37 No. 4 2021 76-85 Original Article Synthesis and Characterization of Hierarchical CeO2 Spherical Nanoparticles for Photocatalytic Degradation of Methylene Blue Le Huu Trinh1 2 Nguyen Duc Cuong1 Do Dang Trung3 Nguyen Van Hieu4 1 Hue University 77 Nguyen Hue Phu Nhuan Hue Vietnam 2 Ba Ria-Vung Tau College of Education 689 Cach Mang Thang Tam Long Toan Ba Ria Vietnam 3 University of Fire Fighting and Prevention Khuat Duy Tien Thanh Xuan Hanoi Vietnam 4 Phenikaa University Nguyen Van Trac Ha Dong Hanoi Vietnam Received 13 April 2021 Revised 26 April 2021 Accepted 26 April 2021 Abstract In this study hierarchical CeO2 spherical nanoparticles were fabricated by the polyol method using Ceri III acetate hydroxide sodium hydroxide and triethylene glycol as precursors. The product was characterized by XRD SEM and TEM. The results show that the cerium oxide spherical nanoparticles built from primary nanoparticles with the average size of 5 nm exhibited dispersion and uniform size and shapes with their average particle diameter of 50 nm in size. With such a good morphology CeO2 material possessed good catalytic activity for the decomposition of methylene blue MB in which the material was synthesized at a hydrothermal temperature of 80 oC CeO2-80 for the best MB decomposition performance. Keywords CeO2 hierarchical nanostructure polyol method photocatalyst methylene. 1. Introduction Cerium dioxide CeO2 one of the most important compounds of rare earth elemental materials is attracting a lot of research interest because of its unique physical and chemical properties low cost and abundance. To date CeO2 nanomaterial has been a promising candidate for a variety of application scopes such as gas sensor 1 catalyst 2 environmental treatment 3 and biomedicine 4 etc. It is _ Corresponding author. E-mail address nguyenduccuong@ https 2588-1124 76 L. H. Trinh et al. VNU Journal of Science .
