Research Of Nanofibers Materials In The Photocatalysis Of Removal Of Organic Pullants From Water

Fe3+/TiO₂nanofibers with different iron content and TiO₂/ZnTiO₃composite nanofiberswere synthesized via electrospinning and sol-gel method. The fabricated samples werecharacterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, andthmogravimetry-differential thermal analysis （TG-DTA）. The photocatalytic activity of theprepared nanofibers photocatalyst was investigated by the photocatalytic degradation ofmethylene blue （MB） at ultraviolet lamp. The results show that Fe3+/TiO₂nanofibers byelectrospinning have a better photocatalytic property than Fe3+/TiO₂powders and TiO₂/ZnTiO₃composite nano?bers calcined at550oC have the highest photocatalytic property.In addition, based on the above methods, we have prepared magnetically separableZnFe₂O₄/TiO₂nanofibers photocatalyst with visible light response and SrFe₁₂O₁₉/TiO₂nanofibers that could be recycled after photocatalysis. The fabricated nanofibers werecharacterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, vibratingsample magnetometer （VSM）, and energy dispersive X-ray spectroscopy （EDS）. Thephotocatalytic property and recyclability of the fabricated samples were evaluated usingmethylene blue （MB） as a model organic compound. The result revealed that ZnFe₂O₄/TiO₂nanofibers present a good photocatalytic activity under visible light irradiation and show amagnetic response and SrFe₁₂O₁₉/TiO₂nanofibers posess permanent magnetism. Furthemore,after recycling for six times, SrFe₁₂O₁₉/TiO₂nanofibers presented almost the similarphotocatalytic activity as the photocatalyst used in the first recycle time, and every time therecovery rate was above90%.