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.