Fe3O4 nanoparticles were prepared solvothermally and then covered with boehmite shell via hydrothermal assisted sol-gel processing of aluminum 2-propoxide. Then the hydroxyl covered outer surface of the boehmite shell was covalently functionalized with 3-(tri-methoxysilyl) propylamine and the terminal amine groups converted to imine by refluxing with 2-hydroxybenzaldehyde. Then it was used to support bis-acetylacetonato-di-oxo-molybdenum (VI). The supported catalyst was characterized by Fourier transform Infrared spectroscopy, elemental analysis, inductive coupled plasma and transmission electron microscopy analysis and it was applied in the epoxidation of cis-cyclooctene. The catalytic procedure was optimized for different parameters such as solvent, oxidant, and temperature. The reaction progress was investigated by gas-liquid chromatography analysis. The used catalyst was simply recovered from the solution by applying a magnet and recycling experiments revealed that this heterogeneous nano-catalyst could be repeatedly applied for the epoxidation of cis-cyclooctene. The optimized conditions were also used for the epoxidation of some other alkenes successfully. تفاصيل المقالة

Due to the pollution of dyeing and textile industry wastewaters in different colors and the need to remove these pollutants from the wastewaters, it is necessary to study and develop effective and efficient technology solutions required. To remove dye from aqueous solutions, photodegradation is employed as an effectively simple way. Thus, the BiOBr photocatalyst was chemically made by synthesis using a facile method. To enhance its photocatalytic activity, the synthesized BiOBr nanoplates were then functionalized with Ag NPs forming the modified BiOBr/Ag photocatalyst. The BiOBr/Ag nanocomposite was synthesized with different percentages of Ag to determine its optimized percentage in the photocatalytic process. The characterization techniques of PL, DRS, XRD, EDX, SEM, FT-IR, and Raman were used to confirm the prepared samples. The power-down white light lamp was used in the photocatalytic process, which showed good degradation. The photocatalytic activity of prepared BiOBr/Ag was investigated by the degradation of the 2,4-dichlorophenol, methyl orange, and rhodamine B. The effective separation and inhibited recombination of photo-generated electron-hole pairs resulted from the high photocatalytic activity. تفاصيل المقالة