Study on Modification of Nano-Sized Anatase Titanium Dioxide by Nitrogen-Plasma

【摘要】 <正> The nano-sized particles of anatase titanium oxide （TiO₂） were obtained by hydrolysis of titanium ester （TNB） in basic media and dehydrated in acid media. And then the anatase titanium oxide was treated with nitrogen plasma. The effect of nitrogen plasma treating time on the activity of photo-catalytic reduction of the Cr₂O₇^2- for sample obtained was investigated. The samples were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, Transmission Electron Microscope （TEM） and Ultraviolet （UV）. A peak of 396 eV in the N1s XPS spectra of sample obtained with nitrogen plasma treated TiO₂ showed that nitrogen-doped titanium oxide (TiO_2-xN_x) has been obtained. The spectra of UV showed that the light absorption of TiO_2-xN_x obtained by nitrogen plasma treated TiO₂ for 10min. had moved to the visible region. The picture of TEM and spectra of XRD indicated that the crystallographic forms and particle dimension had no apparent change for both the modified and the unmodified TiO₂. When the TiO₂ sample was treated for 7 min with nitrogen plasma, it exhibited best photo-catalytic activity.更多还原

【Abstract】 The nano-sized particles of anatase titanium oxide （TiO₂） were obtained by hydrolysis of titanium ester （TNB） in basic media and dehydrated in acid media. And then the anatase titanium oxide was treated with nitrogen plasma. The effect of nitrogen plasma treating time on the activity of photo-catalytic reduction of the Cr₂O₇^2- for sample obtained was investigated. The samples were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, Transmission Electron Microscope （TEM） and Ultraviolet （UV）. A peak of 396 eV in the N1s XPS spectra of sample obtained with nitrogen plasma treated TiO₂ showed that nitrogen-doped titanium oxide (TiO_2-xN_x) has been obtained. The spectra of UV showed that the light absorption of TiO_2-xN_x obtained by nitrogen plasma treated TiO₂ for 10min. had moved to the visible region. The picture of TEM and spectra of XRD indicated that the crystallographic forms and particle dimension had no apparent change for both the modified and the unmodified TiO₂. When the TiO₂ sample was treated for 7 min with nitrogen plasma, it exhibited best photo-catalytic activity.更多还原