چكيده فارسي :
We report the successful synthesis of Fe3O4-Ag nanocomposites as magnetically recyclable nanocatalyst via reflux process at 80 °C for 3h followed by reduction of Ag+ using green tea leaves extract as the natural source of reducing and stabilizing agent without any surfactant. The process starts with FeSO4•7H2O, Fe2(SO4)3, AgNO3. The structure, morphology, thermal behaviour and magnetic properties of the product were characterized by XRD, FT-IR, FE-SEM, EDX, TG, VSM respectively. The photocatalytic degration of product for azo dyes such as methylen blue (MB), methyl orange (MO) were studied. We designed a new self-made labrotory photocatalytic reactor and then photocatalytic properties of Fe3O4-Ag nanocomposites are studied by mercury lamp and photodegration of MB and MO as a water pollutant evaluated until the photocatalytic process optimized with the process parameters. The parameters that were examined include: initial dye concentration, the mass of Fe3O4-Ag nanocomposites, pH value, and Fe3O4-Ag nano-sized composites. Absorbance spectra were measured using a spectrophotometer and the concentration of the test solution was calculated by using the Beer-Lambert Law. Our test results showed that the photocatalytic Hg lamp/ Fe3O4-Ag is a promising method for treating wastewater. The photocatalyst activity increases with increasing surface area. The work is very interesting in recent years due to the development of new nano-materials.
