Titanium Oxide-Tungsten Trioxide Preparation

Nowadays, it is universal for organic pollutants in the atmosphere or water, and the semiconductor TiO₂ has catalysis and degradation of organic pollutants in the atmosphere or water, it is non-toxic, safe, cheap, abundant, etc., which leads its widely application. However, as a wide band gap semiconductor, TiO₂ can only absorb sunlight accounts from 3% to 5% in the UV light, and thus a lower photocatalytic efficiency; what is more, since the photo-generated holes - electrons pair ,the quantum efficiency of TiO₂ is very low. How can achieve the degradation of organic pollutants in water under visible light conditions?

To overcome these two shortcomings, we prepare a large specific surface area and high catalytic activity of TiO₂ UV nanorods (TiO₂-NRs)by taking the nanometer TiO₂ as a precursor and by hydrothermal calcination; preparing calcined TiO₂-NRs as the carrier at 400 ℃, using a sol - gel method when WO₃ / TiO₂-NRs composite photocatalyst, the results show WO₃ loading of 2%, WO3 / TiO₂-NRs photocatalytic activity under the same light conditions is 5 times of P25. The WO₃-TiO₂ samples were used rhodamine – dichloroph enoxyacetic acid decolorizing, the reaction solution was found to have a high-speed decolorization properties in solution.

Experiment Conclusion:
1. Mesoporous WO₃ / TiO₂ composites prepared by adoption of calcinations hydrothermal and sol - gel Preparation.
2. Tungsten trioxide titanium composites exhibit two-dimensional hexagonal symmetry p6mm pore structure and having anatase crystalline structure.
3. Titanium tungsten trioxide complex is narrower than pure titanium dioxide narrower bandgap.
4. Photocatalytic Performance 4.WO₃ / TiO₂ composites by a xenon light source (λ400 nm) irradiation to degrade organic pollutants in water, compared with pure TiO₂, the photocatalytic activity of composite materials has been significantly improved.

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