Stevia rebaudiana leaf extract mediated green synthesis ofcerium oxide nanoparticles for antibacterial activity and photocatalyticdegradation of Tetracycline

Background and Aim : Cerium oxide(CeO۲-NPs) are multifunctional oxide metal nanoparticlesthat have been considered by many due to their unique properties including antimicrobial,antifungal, semiconducting, and photocatalytic activity.Methods : The CeO۲ nanoparticles were prepared using S. rebaudiana leaf extract via a simplegreen method. The prepared nanoparticles were further characterized by Raman spectroscopy, Xraydiffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission-scanningelectron microscopy (FE-SEM).Results : The FE-SEM results confirmed that the CeO۲ nanoparticles were nano size (۱۰-۵۰ nm).The antibacterial activity of CeO۲-NPs against Pseudomonas aeruginosa and Enterococcusfaecalis has shown that the minimum inhibitory concentration (MIC) was ۶.۲۵ and ۱۲.۵ μg/mLand Minimum Bactericidal Concentration (MBC) were ۱۲.۵ and ۲۵ μg/mL respectively. In thepresence of CeO۲ –NPs (under optimal conditions: catalyst dosage = ۰.۷۵ g/L, TC concentration= ۵ mg/L, pH=۱۰), about ۸۰.۶۸% of tetracycline (TC) was degraded after ۴۵ min UV-irradiationthat it’s indicative of the acceptable photocatalytic property of CeO۲-NPs.Conclusion : We believe that the obtained novel photocatalyst may be widely utilized in differentfields including photocatalytic decomposition of organic compounds, dye-sensitized solar cell andair purification and so on.

کلیدواژه ها:

Cerium oxide ، Biosynthesis ، Antibacterial activity ، Photodegradation ، Steviarebaudiana ، Tetracycline