جستجوی مقالات مرتبط با کلیدواژه « رز بنگال » در نشریات گروه « شیمی »

In this research, spherical ZnO nanoparticles (ZnO NPs) and also ZnO nanoparticles impregnated with Rose Bengal dye (dye/ZnO) were synthesized easily by a new method. The resulting particles with the visible light absorption ability were used as modified photocatalysts for the degradation of phenolic pollutants. ZnO nanoparticles and dye/ZnO were identified with X-Ray Diffraction (XRD) analysis, Fourier Transform InfraRed (FT-IR) spectroscopy, Scanning Electron Microscopy (SEM), thermal analysis (TGA/DSC), and UltraViolet-Visible spectroscopy (UV-Vis). The energy gap of dye/ZnO was calculated to be about 2/9eV. Experiments showed degradation of phenol by dye impregnated ZnO nanoparticles under visible light has better efficiency in comparison with the pure ZnO nanoparticles. At the time of 130 minutes, dye/ZnO nanoparticles could degrade approximately 96% of phenol, while the pure ZnO nanoparticles had 10% efficiency at the same time. The mechanism of the reaction is based on the optical excitation of both ZnO semiconductor and dye molecules and then charge transfer.