Si doped TiO2 nanoparticles were synthesized by the microemulsion (ME) in bis (2-ethylhexyl) sodium sulfosuccinate (AOT)/cyclohexane/water reverse micelle. The effects of [water]/ [Surfactant] (W0), temperature on the size and morphology of the spherical Si doped TiO2 nanoparticles were investigated. The size of Si doped TiO2 nanoparticles displayed an interesting variation with the increases of W0 and temperature. The photocatalytic properties of the spherical Silica-titania nanoparticles became better when low W0 were used and the spherical regularity was very good. In this study, highest catalytic activity was found to be strongly dependent both on W0 and Temperature calcined. In addition, the Fe doped TiO2 nanoparticles calcined at W0 = 2 and 3500C shows the highest activity on the photocatalytic decomposition of methylene blue (k= 2.4 10-2 min-1). The properties Fe doped TiO2 nanoparticles investigated by X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), UV-visible and differential thermal analysis (DTA).

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