Tungsten Trioxide Hydtates

Tungsten oxide, also known as tungsten trioxide or tungstic anhydride, WO3, is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals.Tungsten ores are treated with alkalis to produce WO3. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to the pure metal.

Tungten trioxides and tungsten trioxide hydrate were synthesized via mixing tungsten with H2O2 in a water bath. Samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, cyclic voltammetry. The UV-visible photo activity was ebaluated through the photo degradation of methyl orange in aqueous solution. The effects of photoreaction conditions on the  photo activity of the obtained samples introduce in detail. Cyclic voltammetry measurements showed that WO3·0.33H2O, WO3·H2O and WO3 have different oxidation-reduction potential, that lead to a higher conductive band of WO3·0.33H2O than H/H2. The experimental indicanted that photoactivity of WO3·0.33H2O was deeply related with the crystal structure and energy band structure.

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