Pure and Fe-doped Al 2 O 3 nanoparticles (NPs) were synthesized with different iron doping percentage of 1, 3, and 5 mol% employing sol gel technique with AlCl 3 , FeCl 3 as well as ethylene glycol (EG) and Polyvinylpyrrolidone (PVP) stabilizers as precursors. The XRD results indicated that the hexagonal structure of Fe/Al 2 O 3 nanocomposite with alpha phase was formed by the substitution of Fe 3+ ions in the alumina network. The sizes of the NPs obtained for the pure samples and doped samples at percentage dopant of 5% were 35 and 28 nm, respectively.The results of FTIR optical analysis showed the vibrational bond at the wavelength of 448 cm −1 , indicating the Al-O band in the sample. The UV-DRS analysis showed that the energy band gap for the pure NPs was 4 eV, but with increase in iron dopant up to 5%, it decreased to 3.42 eV. In addition, the results of photoluminescence (PL) analysis demonstrated that with increase in doping percentage, the PL intensity diminished. VSM magnetic analysis showed that with increase in iron dopant, the ferromagnetic state emerged in the NPs at saturation magnetism of 0.136 emu/g. Finally, photocatalytic experimental results demonstrated that 5% Fe-doped Al 2 O 3 NPs effectively degrade MB approximately 53%.
K E Y W O R D Salpha phase, catalyst, crystal structure, Fe/Al 2 O 3 nanocrystals, solgel, XRD
This study aimed to investigate the effects of complementary rainbow trout diets with different concentrations of Celmanax® (active compounds of Saccharomyces cerevisiae with mannan-oligosaccharide (MOS)) on immune responses, pressure resistance and resistance to Yersiniosis. Rainbow trout were fed with a diet containing various concentration levels of S.cerevisiae with MOS (prebiotic) (0, 0.1, 0.5 and 1%) for 60 days. While evaluating some of the parameters of the immune system, the blood samples were prepared from the tuber stem vein every 30 days. On day sixty of the study, various stress tests including temperature increases, hypoxia and induction of experimental disease with Yersinia ruckeri were also performed in all the experimental groups.
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