Copper-supported Tungsten Oxide Nanotubes

In the field of semiconductor photocatalysis, titanium dioxide has been widely studied, but its bandgap is wide (3.2ev). Only ultraviolet light can excite it to produce photogenerated carriers. In sunlight, the proportion of ultraviolet light is very small, so the utilization of sunlight in pure titanium dioxide photocatalysis process is very low.

In order to solve the congenital deficiency of tungsten oxide, doping is the most appropriate solution. Some scholars adopted a copper-supported tungsten oxide nanotube process. By loading copper ions on the surface of tungsten oxide nanotubes, the catalytic activity of tungsten oxide nanotubes for visible light degradation of organic gases was enhanced, and the photocorrosion of tungsten oxide was reduced by alkali etching. Corrosion improves the service life of tungsten oxide. The doping process is as follows:

Step A: The WO₃ nanotube dispersions were prepared by ultrasound in deionized water for 1 to 10 minutes.

Step B: Loading copper ions: Soluble copper salt solution was slowly added to WO₃ nanotube dispersion, reacted at 30-50 ℃ for 1-3 h, filtered or centrifuged to obtain solid phase.

Step ℃, the solid phase obtained in step B was dispersed into aqueous solution with pH of 9.0-10, stirred at room temperature for 10-20 hours, filtered or centrifuged, and dried to obtain copper-loaded tungsten oxide nanotubes.

After doping, the photocatalytic degradation efficiency of tungsten oxide is effectively improved by the loading of copper ions. Compared with ordinary tungsten oxide powder, the synthesis of tungsten oxide nanotubes greatly enhances the specific surface area of tungsten oxide, further enhances the contact area between copper and tungsten oxide, and the contact area between copper-loaded tungsten oxide and harmful gases. The photocatalytic degradation efficiency of copper-loaded tungsten oxide nanotube photocatalytic material is excellent in visible light degradation of pollutants. The degradation efficiency of acetaldehyde reaches 95% in 4 hours. The photocatalytic material has stable performance and long service life.

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