The position of the valence band of WO3 is higher than that of TiO2. Therefore, the holes in the valence band of WO3 can migrate to the valence band of TiO2 to promote the transfer and separation of electron holes and improve the photocatalytic efficiency. Therefore, composite semiconductor TiO2-WO3 has gradually become a research hotspot. Well, do you know how to prepare TiO2-WO3 photocatalyst?
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Preparation of TiO2-WO3 Photocatalyst
Add quantitative P25 to dilute nitric acid, under stirring, metered ammonium tungstate hydrate was added, and the mixed solution was stirred at room temperature for 0.5-2 h until a homogeneously mixed suspension was formed. Let stand for 15-30 h at room temperature, collect the prepared powder and wash with deionized water, dry at 80-120 °C, calcinate at high temperature of 450-650 °C for 12-30h. After hydrogenation at 200-600 °C in a pure hydrogen atmosphere, a visible light-responsive surface oxygen-deficient TiO2-WO3 photocatalyst was obtained. The obtained photocatalyst can rapidly degrade toluene in a short time, and its removal rate is up to 73%. The catalytic activity of the prepared photocatalyst is good. And the preparation process is simple so that it is easy to carry out large-scale production.
