Nanometer tungsten trioxide powder may be prepared by solvothermal method and used as a photocatalyst. As one of the earliest studied photocatalysts, tungsten trioxide is environmentally friendly with excellent photostability so that it has broad application prospects in the fields of photocatalytic water splitting, photoelectrochemical cells and pollutant removal.
Solvothermal Method to Produce Cubic Phase Hydrated Tungsten Trioxide Photocatalyst
The solvothermal method was used to prepare cubic phase hydrated tungsten trioxide (cWO3•0.5H2O) photocatalyst with grain size of 120nm~180nm. The study had found:
1. Acetone and urea play roles in adjusting pH value of the reaction system during production, and together with intermediate products to affect the crystal structure and the microstructure of sample.
2. The constitution water in hydrated tungsten trioxide has an important influence on its photocatalytic performance. The photocatalytic performance of sample is significantly reduced if it loses crystal water. And the photocatalytic activity is restored after regaining the crystal water.
More than 99% Rhodamine B may be degraded by the synthesized cubic phase WO3•0.5H2O after illuminated for 220 minutes.
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