Facile Synthesis of Magnesium Oxide Nanoparticles for Studying Their Photocatalytic Activities Against Orange G Dye and Biological Activities Against Some Bacterial and Fungal Strains

In this work, MgO nanoparticles were synthesized via the combustion method using glutamine and L-arginine as fuels for the first time. Also, the synthesized MgO products were identified utilizing FT-IR, XRD, HR-TEM, FE-SEM, UV–Vis, and PL techniques. Besides, the synthesized MgO samples were used for the photochemical degradation of orange G dye as well as biological activity against some bacterial (Staphylococcus aureus and Escherichia coli) and fungal (Candida albicans and Aspergillus flavus) strains. The XRD confirmed that the average crystallite size of MgO products, which were produced using glutamine and L-arginine fuels, is 35.19 and 26.45 nm, respectively. Also, The FE-SEM images confirmed that the MgO products, which were produced using glutamine and L-arginine fuels, is comprised of irregular and flaky shapes with an average size of 13.16 and 9.02 µm, respectively. Additionally, the greatest percent of degradation of orange G dye was 92.30 and 96.60% after 120 min using the MgO samples which were synthesized using glutamine and L-arginine fuels, respectively. Furthermore, the MgO samples show moderate biological activity against bacterial strains whereas they show no biological activity against fungal strains.