| Autor: |
Alharshan GA; Physics Department, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia., Almohammedi A; Physics Department, Faculty of Science, Islamic University of Madinah, Almadinah Al-Munawarah 42351, Saudi Arabia., Uosif MAM; Physics Department, College of Science, Jouf University, Sakaka P.O. Box 2014, Saudi Arabia., Shaaban ER; Physics Department, Faculty of Science, Islamic University of Madinah, Almadinah Al-Munawarah 42351, Saudi Arabia.; Physics Department, Faculty of Science, Al-Azhar University, Assiut 71542, Egypt., Emam-Ismail M; Spectroscopy of Polarized Light Laboratory, Physics Department, Faculty of Science, Galala University, New Galala City 43511, Egypt.; Thin Films Laboratory, Physics Department, Faculty of Science, Ain Shams University, Cairo 11566, Egypt. |
| Abstrakt: |
The precursor nanoparticles of nickel hydroxide (Ni(OH) 2 ) and nickel oxide (NiO) were successfully converted into the latter by the reaction of nickel chloride with hydrazine at ambient temperature. (TGA) and (DSC) were adapted for annealing the precursor products at different annealing temperatures (210, 285, 350, 390, 425, and 450 °C). XRD, TEM, and UV-VIS absorption spectroscopy were used to characterize the products. Both the band edge and energy gap values decrease with increasing annealing temperatures. Hysteresis loops are visible in the M-H curves of annealed (350 °C and 390 °C) precursor NiO NPs, indicating the presence of ferromagnetic Ni domains. However, NiO nanoparticles annealed at higher temperatures (425 °C and 450 °C) had a straight M-H curve, indicating paramagnetic properties. NiO NPs were used to study photocatalysis in the degradation of the MB dye. As annealing temperatures increased, the catalyst caused the degradation of MB. The sample that was annealed at 450 °C, however, exhibits the maximum photocatalytic activity, reaching up to 72.4% after being exposed to visible light. In other words, it was discovered that as the catalyst's annealing temperature rose, so did the rate of MB's photocatalytic degradation. |
