Preparation and Properties of the Photocatalytic Films on the Surface of Electronic Pole Tourmaline Mineral Particles
|School||Hebei University of Technology|
|Course||Materials Physics and Chemistry|
|Keywords||Sol-gel Titania Tourmaline Photoelectrocatalysis Photocatalysis|
A kind of novel composite photocatalysts containing TiO2 and tourmaline particles, such as tourmaline/TiO2 composite photocatalysts and tourmaline/[TiO2, SiO2] composite photocalysts, were fabricated mainly by the sol-gel technique, whose microstructure, photocatalystic activities and spontaneous polarization were investigated by the scanning electron microscope(SEM), UV-visible spectro-photometer, etc.The novel porous composite films of tourmaline/TiO2 were prepared from alkoxide solutions on the surface of copper by sol-gel method. Results show that the empty and porous balls of TiO2 were grown on the surface of fine tourmaline particles dispersing in the TiO2 film based on the copper net, under the effect of the nature electric field of fine tourmaline particles. The average diameter of the empty balls is 2 μm, and the photocatalystic degradation ratio of methyl orange increased by 15.6% with the composite film of TiO2 containing 0.5 wt % tourmaline than with the thin films of TiO2 under the irradiation of ultraviolet.In this paper, not only a new method to testify the spontaneous polarization of tourmaline is provided, but also the influence of treatment temperature on the spontaneous polarization of tourmaline/[TiO2, SiO2] composite photocatalysts containing 10wt% SiO2 are observed. Results show that tourmaline/[TiO2, SiO2] composite photocatalysts granules, under the bombardment by electron beam in SEM, will turn to be brighter and attract each other, and the electrostatic gravitation among the tourmaline/[TiO2, SiO2] composite photocatalysts granules grow up evidently on their surfaces with the accumulations of electron from the electron probe, so as to be strong enough to force the tourmaline/[TiO2, SiO2] composite photocatalysts granules be shifted rapidly and accumulated into clusters ultimately.Photocatalytic activities and mutual interactions mechanism between TiO2 and fine tourmaline particles were investigated, respectively. Photoelectrocalalytic reaction happens in the reaction system, in which electrons and cavities generated from nanometer TiO2 under irradiation of ultraviolet will be avoided compounding due to existence of permanent and strongly electric field of fine tourmaline powders.