Production of titanium dioxide powders by atmospheric pressure plasma jet

TiO2 powders have been successfully synthesized by atmospheric pressure plasma jet (APPJ), which operates by feeding air between two coaxial electrodes that are driven by a 20.8 kHz power source. Tetrachloride titanium is mixed with the effluent of the plasma jet in deferent regions to produce TiO2 powders. The synthesized samples were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The chlorine contents in the TiO2 powders were determined by the energy dispersive spectroscopy (EDS). Photocatalytic activities of samples were measured by FT-IR spectroscopy based on the destruction of stearic acid layers. And the effects of post-discharge plasma and deposition parameters were studied with respect to the morphology of TiO2 powders. The results show that crystallized TiO2 anatase structure can be obtained at the temperature ranged from 150 degrees C to 250 degrees C. (C) 2011 Published by Elsevier B.V. Selection and/or peer-review under responsibility of Selection and/or peer-review under responsibility of Lanzhou Institute of Physics, China.