چكيده به لاتين
In the present study, the phase characterization, microstructure, optical properties, magnetic properties, and ability to degrade methylene blue under visible light irradiation (photocatalytic properties) of calcium ferrite nanoparticles have been investigated. The samples containing lanthanum, bismuth, and cobalt dopants were synthesized using the solution combustion method. X-ray diffraction (XRD) was utilized to examine the phase, field emission scanning electron microscopy (FE-SEM) was employed to investigate the microstructure, diffuse reflectance spectroscopy (DRS) was used to calculate the bandgap, vibrating sample magnetometry (VSM) was performed to measure the magnetic properties, and UV-Vis spectroscopy was utilized to assess the degradation of methylene blue under visible light irradiation. A single-phase calcium ferrite with an orthorhombic structure was achieved in the base sample (CFO) at a temperature of 700 °C. The sample containing 1 mol% lanthanum (CFLO3), the sample containing 1 mol% bismuth (CBFO3), and the sample containing lanthanum and cobalt dopants (CCFLO) exhibited a single-phase calcium ferrite structure, while the sample containing bismuth, cobalt, and lanthanum dopants (CCFBLO) crystallized into a di-ferrite structure. The microstructure obtained from FE-SEM images for all samples is porous and sponge-like. The results from the DRS analysis imply that the bandgap of the base sample is equal to 1.79 eV. This value decreases to 1.5, 1.68, 1.54, and 1.55 eV for the CFLO3, CBFO3, CCFLO, and CCBFLO samples, respectively. The maximum magnetization obtained from the VSM test for the base sample and CFLO3, CBFO3, CCFLO, and CCBFLO samples were 1.2 emu/g, 7.76 emu/g, 4.76 emu/g, 11.74 emu/g, and 8.9 emu/g, respectively. In the investigation of photocatalytic properties, the base sample was able to achieve less than 1% degradation of methylene blue under visible light in 120 minutes. In contrast, the photocatalytic performance of the CFLO3, CBFO3, CCFLO, and CCBFLO samples increased to 76%, 86%, 82%, and 81% under identical conditions. Considering the results obtained, doped calcium ferrite can be regarded as an efficient photocatalyst for further studies and investigations.
