Preparation and evaluation of bismuth oxide nanoparticles by thermal degradation of metal organic framework

Metal-organic frameworks have great application potential due to high pore volume, regular pore network, high surface area, simultaneous presence of organic and inorganic groups. Nowadays preparation of metal oxide nanoparticles is developed by thermal degradation of metal-organic frameworks. The aim of this study was to prepare bismuth oxide nanoparticles by thermal degradation method to remove organic section from metal-organic framework based on bismuth metal.

Bismuth oxide nanoparticles were investigated by X-ray diffraction (XRD) for determination of the crystalline structure, Fourier transform infrared spectroscopy (FTIR) for investigation of functional groups, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) for study of size and shape, energy dispersive X-ray spectroscopy (EDS) to confirm the chemical composition, and diffuse reflection spectroscopy (DRS) to determine ultraviolet absorption and band gap energy. The antibacterial activity of these nanoparticles was evaluated against Salmonella as Gram-negative bacteria and Staphylococcus aureus as Gram-positive bacteria.

Bismuth oxide nanoparticles were prepared in a spherical shape and uniformly with crystal structure by the thermal degradation method of metal-organic framework based on bismuth metal. The potential applications of these nanoparticles can expand the advancement in the field of medical science.

The results indicate that bismuth oxide nanoparticles have UV-blocking and antibacterial activity and can have good potential for various applications especially in medical, pharmaceutical, nutritional, and cosmetic fields.