Of Tio <sub> 2 </ Sub> Nanotube Modification And Photocatalytic Performance Study

TiO2 is an important kind of inorganic functional material. Due to its inexpensiveness, nontoxicity, no choice, good chemistry stability, TiO2 photo-catalytic technology has been rapidly developed and comprehensively applied in photo-catalytic degradation of atmospheric and water contamination and so on.In this article, the TiO2 nano particles were used to prepare titanium dioxide nanotubes (TiO2-NTs) by hydrothermic process. And then the modificated of TiO2-NTs were further invested via semiconduction recombination. The properties of as-prepared products were characterized by TEM, SEM, EDS, XRD, BET and UV-vis. The performance of TiO2 nanotubes promoting photodegradation of rhodamine B was studied.The TiO2 nano particles were prepared using tetrabutyl titanate as the precursor in the sol-gel process. The TiO2-NTs were synthesized by hydrothermal method, successfully. The results show that the anatase TiO2-NTs crystallization are better with calcining at 400℃. Both the shape and the crystalline structure of the nanotubes are not changed. The specific surface of nanotubes are substantial increase, whrich obtained 220.7 m2·g-1. The diameters of the nanotubes are about 5-10nm and the length ranges from approximately 0.1μm to 1μm. The photocatalytic activity under UV-light irradiation is superior over that of the titanate nanoparticles. TEM and SEM results show that TiO2-NTs were obtained by the sheet from the powder, then rolled up into tubes during the hydrothermal preparation process.The ZnO-TiO2-NTs complex materials were obtained by deposition method using zinc acetate and the as-prepared TiO2-NTs as raw materials. By optimizing the parameters, ZnO-TiO2-NTs have been prepared under the following conditions:ZnO content of 20 at %, NaOH concentration of 0.2M. Both the shape and the crystalline structure of the nanotubes are not changed after modification. ZnO-loaded nanoparticles are hexagonal wurtzite with an average size of about 6 nm and distribute on the surfaces of TiO2-NTs evenly. Uv-vis Spectrum has slight red shift. The nanocomposites have good reproducibility and the photo-catalytic activity under UV-light irradiation is superior over that of the ZnO and the titanate nanotubes. There is the most appropriate doping ratio of ZnO for ZnO-TiO2-NTs complex materials. When the content of ZnO is 20 percent the ZnO/TO2-NTs have the best photo-catalytic ability. The photo-catalytic ability of ZnO-doped TiO2 nanotubes for degradation of rhodamine B will deteriorate when the doping level is both higher and lower than the best value. The photo-catalysis performance of nanotubes will descend with the increasing original concentration of rhodamine B.