Abstract
Hematite nanotube arrays were prepared by electrochemical anodizing of iron in an ethylene glycol solution containing NH4F and H2O and ultrasonic wave was used to clean the surface of these nanotubes in the medium of water. The resulting samples were characterized by field-emission scanning electron microscope (FESEM), energy dispersive X-ray spectrometer, X-ray diffraction and ultraviolet-visible spectroscopy. The prepared nanotube arrays showed a tube diameter of 40–80 nm. Also FESEM images showed that the precipitate on the surface of the nanotubes could be removed by the ultrasonic wave. Both sample show similar band gap values. The photocatalytic activities of these photocatalysts were evaluated by photodegradation of methylene blue (MB) and the production of hydrogen under xenon light illumination. Our results depict that the efficiency of photocatalytic performance in the hematite nanotubes treated by sonication is greater than that found in the untreated sample.
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