فهرست نشریات علمی دسترسی آزاد ایران

The nano-nickel oxide particles have been prepared by the biosynthesis method from a reaction of Ni(NO3)2.6H2O with the help of Phyto-constituents present in the garlic extract solution as both capping and stabilizing agents, and heating sediment at 400 °C for five hours. The surface of nano-NiO particles was rectified by palmitic and stearic acids. The change of property of hydrophobic of coated nano-NiO particles was proved via lipophilic degree (LD) tests. These results proved that the LD of the coated nano-NiO particles increased with increasing the rectifier values to up to 5.0 wt%. Optimal surface coating of nano-NiO particles was also achieved at 35 °C during a reaction time of 150 min. The coated nano-NiO particles were identified by XRD pattern, EDX and FT-IR spectra, TGA analysis, and SEM images. The results showed that the chains of palmitic and stearic acids have been effectively connected onto the surface of nano-NiO particles and that percentage of grafting can reach 2.1 and 2.7 wt% respectively. The SEM images show a good dispersity after the coating of nano-NiO particles by fatty acids. This betterment in the dispersal of nano-NiO particles indicated that grafted chains of fatty acids on nano-NiO particles could markedly prevent aggregation of nano-NiO particles in acetone and liquid paraffin. The photocatalytic behavior of improved nano-NiO particles was also investigated for the destruction of methyl orange (MO). The results proved that catalytic destruction of nano-NiO particles decreases when anchored by palmitic and stearic acids.