Effects of NO3-, Cl-, and CH3COO- anions and diethylene glycol on the morphological, structural, antidiabetic, and cell viability properties of CeO2 nanoparticles

Gd(OH)3 and Co-Doped Gd(OH)3 for Photocatalytic Degradation of 4-Nitrophenol and Brilliant Green

The microwave-assisted synthesis method was used to synthesize gadolinium hydroxide nanorods (GH NRs) and 4-12% cobalt-doped gadolinium hydroxide nanorods (4CGH, 8CGH, and 12CGH NRs). X-ray diffraction confirmed that the GH NRs and CGH NRs are in the hexagonal phase with average crystallite sizes between 17 and 36 nm. Raman and FT-IR spectra confirmed the presence of vibrational modes of GH and CGH. The influence of Co doping was observed in the reduction of the band gap energy from 5.00 to 4.29 eV. TEM images showed nanorods of GH and CGH and that the particle size was increased upon doping with Co2+. Photocatalytic degradations of 4-nitrophenol (4-NP) and brilliant green (BG) were carried out under UV light irradiation in which 8CGH NRs had the highest photocatalytic degradation of BG (90%) with a kinetic rate of 0.4636 h-1, while 12CGH NRs showed the highest photocatalytic degradation of 4-NP (78%) with a kinetic rate of 0.2426 h-1. Both photocatalytic degradation activities using the synthesized materials followed a pseudo-first-order kinetic reaction. Therefore, GH and CGH NRs demonstrated efficient application under UV light irradiation.

α-Glucosidase Inhibitory Activity and Cytotoxicity of CeO2 Nanoparticles Fabricated Using a Mixture of Different Cerium Precursors

A mixture of three distinct cerium precursors (Ce(NO3)3·6H2O, CeCl3·7H2O, and Ce(CH3COO)3·H2O) was used to prepare cerium oxide nanoparticles (CeO2 NPs) in a polyol-mediated synthesis. Different ratios of diethylene glycol (DEG) and H2O were utilized in the synthesis. The properties of the synthesized CeO2 NPs, such as structural and morphological properties, were investigated to observe the effect of the mixed cerium precursors. Crystallite sizes of 7-8 nm were obtained for all samples, and all synthesized samples were confirmed to be in the cubic phase. The average particle sizes of the spherical CeO2 were between 9 and 13 nm. The successful synthesis of CeO2 can also be confirmed via the vibrational band of Ce-O from the FTIR. Antidiabetic properties of the synthesized CeO2 NPs were investigated using α-glucosidase enzyme inhibition assay, and the concentration of the synthesized CeO2 NPs was varied in the study. The biocompatibility properties of the synthesized CeO2 NPs were investigated via cytotoxicity tests, and it was found that all synthesized materials showed no cytotoxic properties at lower concentrations (62.5-125 μg/mL).