Synthesis and Characterization of Ce3+-Activated Orthovanadate Oxides M3(VO4)2 (M: Ni or Co) for Their Photocatalytic Performances
摘要
This paper explores the synthesis of orthovanadate oxides M3(VO4)2 (M: Ni or Co) through the solution combustion route. The study delves into the structural and photocatalytic properties of these oxides, with a focus on the influence of cerium (Ce) doping. The results indicate that all synthesized samples exhibit a crystalline phase with an orthorhombic structure. Notably, the introduction of Ce3+ ions enhances the crystallization process, leading to an increase in the XRD peak intensity in the materials. Fourier transform infrared spectra reveal absorption bands between 550–400 cm−1, attributed to the stretching vibrations of the M–O bonds within the MO6 octahedral structures. The morphology of the orthovanadate oxides is characterized by numerous nearly spherical grains, some featuring faceted surfaces. The bandgap energy values for Ni3(VO4)2 and Co3(VO4)2 are initially measured at 2.20 and 1.86 eV, respectively, and increase to 2.42 and 2.05 eV, respectively, upon Ce3+ doping. Importantly, the inclusion of Ce3+ positively influences the photocatalytic performance of M3(VO4)2, suggesting potential applications in photocatalysis.