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Synthesis and photocatalytic activity of porous titanium dioxide nanotubes

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Document pages: 10 pages

Abstract: The porous titania nanotubes with enhanced photocatalytic activity were successfully synthesized by sol-gel method using the common natural cellulose (filter paper) and three block copolymer (Pluronic P123) micelles as the double templates. Firstly, P123 micelles were adsorbed on the surface of filter paper cellulose nanofibers, and then tetrabutyl titanate was hydrolyzed and condensed around the micelles to form titanium dioxide layer. After removing the organic template by calcination, graded titanium dioxide nanotubes with pores on the wall were obtained. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption desorption, Fourier transform infrared spectroscopy (FT-IR) and ultrasoundaviolet-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS), and X-ray photoelectron spectroscopy (XPS). As compared with commercial P25 catalyst, the porous titania nanotubes prepared by this method displayed significantly enhanced photocatalytic activity for degrading methyl orange under UV irradiation. Within 10 minutes, the porous titania nanotubes are able to degrade over 70 of the original MO, while the value for the commercial Degussa P25 is only about 33 .

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