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This present study has been described the synthesis, characterization and antibacterial activity of gadolinium doped cerium oxide nanoparticles. The nanoparticles were prepared by hydrothermal method with various concentrations of gadolinium ranges from 2 mol% to 8 mol%. The X-ray diffraction (XRD) pattern revealed the face-centered cubic structure with crystalline size of 58.3 nm to 57.4 nm with increasing the concentration of gadolinium (2 mol% to 8 mol%). The Ce-O chemical bonding nature was confirmed using Fourier transform infrared spectrometer (FTIR). The field emission scanning electron microscope (FESEM) exhibited fascinating shapes like cube and square of nanoparticles. UV spectrophotometer used to measure the optical behaviors of CeO 2 nanoparticles. Band-edge absorption of CeO 2 nanoparticles blue shifted upon increasing the gadolinium concentration as compared to undoped CeO 2 nanoparticles. The emission behavior of nanoparticles was examined by photoluminescence (PL) spectroscopy. PL spectra reveals a peak shift of CeO 2 emission upon gadolinium doped due to oxygen defect. The gadolinium doped CeO 2 nanoparticles showed better antibacterial activity against the pathogenic bacteria such as Escherichia coli, Staphylococcus aureus, Bacillus cereus and Salmonella typhi.

This research article reports the green synthesis of SnO 2 nanoparticles and its structural, optical, morphological and photocatalytic behaviors has been achieved by using Delonix elata leaf extract. Three different synthesis routes (i.e., sonication, wet chemical, and microwave method) are employed to prepare SnO 2 nanoparticles. A comparative analysis was performed on the main physical properties to get a broader understanding of the effect of processing parameters on prepared SnO 2 nanoparticles. The prepared SnO 2 nanoparticles were characterized using different techniques like TG, XRD, FESEM, EDX, FT-IR, UV-Vis, PSD, and BET surface area analysis. Furthermore, the application of the prepared SnO 2 nanoparticles as photocatalyst was proceeded to degrade rhodamine B dye.

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